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-rw-r--r--kernel/relay.c4
-rw-r--r--kernel/sched.c8
-rw-r--r--kernel/softirq.c13
-rw-r--r--kernel/trace/Kconfig55
-rw-r--r--kernel/trace/Makefile4
-rw-r--r--kernel/trace/ftrace.c18
-rw-r--r--kernel/trace/kmemtrace.c350
-rw-r--r--kernel/trace/ring_buffer.c55
-rw-r--r--kernel/trace/trace.c876
-rw-r--r--kernel/trace/trace.h61
-rw-r--r--kernel/trace/trace_boot.c1
-rw-r--r--kernel/trace/trace_branch.c278
-rw-r--r--kernel/trace/trace_functions.c193
-rw-r--r--kernel/trace/trace_functions_graph.c306
-rw-r--r--kernel/trace/trace_hw_branches.c174
-rw-r--r--kernel/trace/trace_irqsoff.c34
-rw-r--r--kernel/trace/trace_mmiotrace.c31
-rw-r--r--kernel/trace/trace_output.c829
-rw-r--r--kernel/trace/trace_output.h60
-rw-r--r--kernel/trace/trace_power.c1
-rw-r--r--kernel/trace/trace_sched_wakeup.c78
-rw-r--r--kernel/trace/trace_selftest.c1
-rw-r--r--kernel/trace/trace_stat.c319
-rw-r--r--kernel/trace/trace_stat.h31
-rw-r--r--kernel/trace/trace_workqueue.c281
-rw-r--r--kernel/workqueue.c16
26 files changed, 2873 insertions, 1204 deletions
diff --git a/kernel/relay.c b/kernel/relay.c
index 09ac2008f77b..d06450670c86 100644
--- a/kernel/relay.c
+++ b/kernel/relay.c
@@ -675,9 +675,7 @@ int relay_late_setup_files(struct rchan *chan,
*/
for_each_online_cpu(i) {
if (unlikely(!chan->buf[i])) {
- printk(KERN_ERR "relay_late_setup_files: CPU %u "
- "has no buffer, it must have!\n", i);
- BUG();
+ WARN_ONCE(1, KERN_ERR "CPU has no buffer!\n");
err = -EINVAL;
break;
}
diff --git a/kernel/sched.c b/kernel/sched.c
index 52bbf1c842a8..c154825ae753 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4399,10 +4399,7 @@ void scheduler_tick(void)
#endif
}
-#if defined(CONFIG_PREEMPT) && (defined(CONFIG_DEBUG_PREEMPT) || \
- defined(CONFIG_PREEMPT_TRACER))
-
-static inline unsigned long get_parent_ip(unsigned long addr)
+unsigned long get_parent_ip(unsigned long addr)
{
if (in_lock_functions(addr)) {
addr = CALLER_ADDR2;
@@ -4412,6 +4409,9 @@ static inline unsigned long get_parent_ip(unsigned long addr)
return addr;
}
+#if defined(CONFIG_PREEMPT) && (defined(CONFIG_DEBUG_PREEMPT) || \
+ defined(CONFIG_PREEMPT_TRACER))
+
void __kprobes add_preempt_count(int val)
{
#ifdef CONFIG_DEBUG_PREEMPT
diff --git a/kernel/softirq.c b/kernel/softirq.c
index bdbe9de9cd8d..6edfc2c11d99 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -21,6 +21,7 @@
#include <linux/freezer.h>
#include <linux/kthread.h>
#include <linux/rcupdate.h>
+#include <linux/ftrace.h>
#include <linux/smp.h>
#include <linux/tick.h>
@@ -79,13 +80,23 @@ static void __local_bh_disable(unsigned long ip)
WARN_ON_ONCE(in_irq());
raw_local_irq_save(flags);
- add_preempt_count(SOFTIRQ_OFFSET);
+ /*
+ * The preempt tracer hooks into add_preempt_count and will break
+ * lockdep because it calls back into lockdep after SOFTIRQ_OFFSET
+ * is set and before current->softirq_enabled is cleared.
+ * We must manually increment preempt_count here and manually
+ * call the trace_preempt_off later.
+ */
+ preempt_count() += SOFTIRQ_OFFSET;
/*
* Were softirqs turned off above:
*/
if (softirq_count() == SOFTIRQ_OFFSET)
trace_softirqs_off(ip);
raw_local_irq_restore(flags);
+
+ if (preempt_count() == SOFTIRQ_OFFSET)
+ trace_preempt_off(CALLER_ADDR0, get_parent_ip(CALLER_ADDR1));
}
#else /* !CONFIG_TRACE_IRQFLAGS */
static inline void __local_bh_disable(unsigned long ip)
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index e2a4ff6fc3a6..dde1d46f77e5 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -264,6 +264,38 @@ config HW_BRANCH_TRACER
This tracer records all branches on the system in a circular
buffer giving access to the last N branches for each cpu.
+config KMEMTRACE
+ bool "Trace SLAB allocations"
+ select TRACING
+ help
+ kmemtrace provides tracing for slab allocator functions, such as
+ kmalloc, kfree, kmem_cache_alloc, kmem_cache_free etc.. Collected
+ data is then fed to the userspace application in order to analyse
+ allocation hotspots, internal fragmentation and so on, making it
+ possible to see how well an allocator performs, as well as debug
+ and profile kernel code.
+
+ This requires an userspace application to use. See
+ Documentation/vm/kmemtrace.txt for more information.
+
+ Saying Y will make the kernel somewhat larger and slower. However,
+ if you disable kmemtrace at run-time or boot-time, the performance
+ impact is minimal (depending on the arch the kernel is built for).
+
+ If unsure, say N.
+
+config WORKQUEUE_TRACER
+ bool "Trace workqueues"
+ select TRACING
+ help
+ The workqueue tracer provides some statistical informations
+ about each cpu workqueue thread such as the number of the
+ works inserted and executed since their creation. It can help
+ to evaluate the amount of work each of them have to perform.
+ For example it can help a developer to decide whether he should
+ choose a per cpu workqueue instead of a singlethreaded one.
+
+
config DYNAMIC_FTRACE
bool "enable/disable ftrace tracepoints dynamically"
depends on FUNCTION_TRACER
@@ -302,4 +334,27 @@ config FTRACE_STARTUP_TEST
functioning properly. It will do tests on all the configured
tracers of ftrace.
+config MMIOTRACE
+ bool "Memory mapped IO tracing"
+ depends on HAVE_MMIOTRACE_SUPPORT && DEBUG_KERNEL && PCI
+ select TRACING
+ help
+ Mmiotrace traces Memory Mapped I/O access and is meant for
+ debugging and reverse engineering. It is called from the ioremap
+ implementation and works via page faults. Tracing is disabled by
+ default and can be enabled at run-time.
+
+ See Documentation/tracers/mmiotrace.txt.
+ If you are not helping to develop drivers, say N.
+
+config MMIOTRACE_TEST
+ tristate "Test module for mmiotrace"
+ depends on MMIOTRACE && m
+ help
+ This is a dumb module for testing mmiotrace. It is very dangerous
+ as it will write garbage to IO memory starting at a given address.
+ However, it should be safe to use on e.g. unused portion of VRAM.
+
+ Say N, unless you absolutely know what you are doing.
+
endmenu
diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index 349d5a93653f..f76d48f3527d 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -19,6 +19,8 @@ obj-$(CONFIG_FUNCTION_TRACER) += libftrace.o
obj-$(CONFIG_RING_BUFFER) += ring_buffer.o
obj-$(CONFIG_TRACING) += trace.o
+obj-$(CONFIG_TRACING) += trace_output.o
+obj-$(CONFIG_TRACING) += trace_stat.o
obj-$(CONFIG_CONTEXT_SWITCH_TRACER) += trace_sched_switch.o
obj-$(CONFIG_SYSPROF_TRACER) += trace_sysprof.o
obj-$(CONFIG_FUNCTION_TRACER) += trace_functions.o
@@ -33,5 +35,7 @@ obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += trace_functions_graph.o
obj-$(CONFIG_TRACE_BRANCH_PROFILING) += trace_branch.o
obj-$(CONFIG_HW_BRANCH_TRACER) += trace_hw_branches.o
obj-$(CONFIG_POWER_TRACER) += trace_power.o
+obj-$(CONFIG_KMEMTRACE) += kmemtrace.o
+obj-$(CONFIG_WORKQUEUE_TRACER) += trace_workqueue.o
libftrace-y := ftrace.o
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 7dcf6e9f2b04..7e9a20b69939 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -264,14 +264,6 @@ static void ftrace_update_pid_func(void)
# error Dynamic ftrace depends on MCOUNT_RECORD
#endif
-/*
- * Since MCOUNT_ADDR may point to mcount itself, we do not want
- * to get it confused by reading a reference in the code as we
- * are parsing on objcopy output of text. Use a variable for
- * it instead.
- */
-static unsigned long mcount_addr = MCOUNT_ADDR;
-
enum {
FTRACE_ENABLE_CALLS = (1 << 0),
FTRACE_DISABLE_CALLS = (1 << 1),
@@ -290,7 +282,7 @@ static DEFINE_MUTEX(ftrace_regex_lock);
struct ftrace_page {
struct ftrace_page *next;
- unsigned long index;
+ int index;
struct dyn_ftrace records[];
};
@@ -464,7 +456,7 @@ __ftrace_replace_code(struct dyn_ftrace *rec, int enable)
unsigned long ip, fl;
unsigned long ftrace_addr;
- ftrace_addr = (unsigned long)ftrace_caller;
+ ftrace_addr = (unsigned long)FTRACE_ADDR;
ip = rec->ip;
@@ -576,7 +568,7 @@ ftrace_code_disable(struct module *mod, struct dyn_ftrace *rec)
ip = rec->ip;
- ret = ftrace_make_nop(mod, rec, mcount_addr);
+ ret = ftrace_make_nop(mod, rec, MCOUNT_ADDR);
if (ret) {
ftrace_bug(ret, ip);
rec->flags |= FTRACE_FL_FAILED;
@@ -787,7 +779,7 @@ enum {
struct ftrace_iterator {
struct ftrace_page *pg;
- unsigned idx;
+ int idx;
unsigned flags;
unsigned char buffer[FTRACE_BUFF_MAX+1];
unsigned buffer_idx;
@@ -1903,7 +1895,7 @@ int register_ftrace_function(struct ftrace_ops *ops)
}
/**
- * unregister_ftrace_function - unresgister a function for profiling.
+ * unregister_ftrace_function - unregister a function for profiling.
* @ops - ops structure that holds the function to unregister
*
* Unregister a function that was added to be called by ftrace profiling.
diff --git a/kernel/trace/kmemtrace.c b/kernel/trace/kmemtrace.c
new file mode 100644
index 000000000000..72b326bba005
--- /dev/null
+++ b/kernel/trace/kmemtrace.c
@@ -0,0 +1,350 @@
+/*
+ * Memory allocator tracing
+ *
+ * Copyright (C) 2008 Eduard - Gabriel Munteanu
+ * Copyright (C) 2008 Pekka Enberg <penberg@cs.helsinki.fi>
+ * Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com>
+ */
+
+#include <linux/dcache.h>
+#include <linux/debugfs.h>
+#include <linux/fs.h>
+#include <linux/seq_file.h>
+#include <trace/kmemtrace.h>
+
+#include "trace.h"
+#include "trace_output.h"
+
+/* Select an alternative, minimalistic output than the original one */
+#define TRACE_KMEM_OPT_MINIMAL 0x1
+
+static struct tracer_opt kmem_opts[] = {
+ /* Default disable the minimalistic output */
+ { TRACER_OPT(kmem_minimalistic, TRACE_KMEM_OPT_MINIMAL) },
+ { }
+};
+
+static struct tracer_flags kmem_tracer_flags = {
+ .val = 0,
+ .opts = kmem_opts
+};
+
+
+static bool kmem_tracing_enabled __read_mostly;
+static struct trace_array *kmemtrace_array;
+
+static int kmem_trace_init(struct trace_array *tr)
+{
+ int cpu;
+ kmemtrace_array = tr;
+
+ for_each_cpu_mask(cpu, cpu_possible_map)
+ tracing_reset(tr, cpu);
+
+ kmem_tracing_enabled = true;
+
+ return 0;
+}
+
+static void kmem_trace_reset(struct trace_array *tr)
+{
+ kmem_tracing_enabled = false;
+}
+
+static void kmemtrace_headers(struct seq_file *s)
+{
+ /* Don't need headers for the original kmemtrace output */
+ if (!(kmem_tracer_flags.val & TRACE_KMEM_OPT_MINIMAL))
+ return;
+
+ seq_printf(s, "#\n");
+ seq_printf(s, "# ALLOC TYPE REQ GIVEN FLAGS "
+ " POINTER NODE CALLER\n");
+ seq_printf(s, "# FREE | | | | "
+ " | | | |\n");
+ seq_printf(s, "# |\n\n");
+}
+
+/*
+ * The two following functions give the original output from kmemtrace,
+ * or something close to....perhaps they need some missing things
+ */
+static enum print_line_t
+kmemtrace_print_alloc_original(struct trace_iterator *iter,
+ struct kmemtrace_alloc_entry *entry)
+{
+ struct trace_seq *s = &iter->seq;
+ int ret;
+
+ /* Taken from the old linux/kmemtrace.h */
+ ret = trace_seq_printf(s, "type_id %d call_site %lu ptr %lu "
+ "bytes_req %lu bytes_alloc %lu gfp_flags %lu node %d\n",
+ entry->type_id, entry->call_site, (unsigned long) entry->ptr,
+ (unsigned long) entry->bytes_req, (unsigned long) entry->bytes_alloc,
+ (unsigned long) entry->gfp_flags, entry->node);
+
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ return TRACE_TYPE_HANDLED;
+}
+
+static enum print_line_t
+kmemtrace_print_free_original(struct trace_iterator *iter,
+ struct kmemtrace_free_entry *entry)
+{
+ struct trace_seq *s = &iter->seq;
+ int ret;
+
+ /* Taken from the old linux/kmemtrace.h */
+ ret = trace_seq_printf(s, "type_id %d call_site %lu ptr %lu\n",
+ entry->type_id, entry->call_site, (unsigned long) entry->ptr);
+
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ return TRACE_TYPE_HANDLED;
+}
+
+
+/* The two other following provide a more minimalistic output */
+static enum print_line_t
+kmemtrace_print_alloc_compress(struct trace_iterator *iter,
+ struct kmemtrace_alloc_entry *entry)
+{
+ struct trace_seq *s = &iter->seq;
+ int ret;
+
+ /* Alloc entry */
+ ret = trace_seq_printf(s, " + ");
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ /* Type */
+ switch (entry->type_id) {
+ case KMEMTRACE_TYPE_KMALLOC:
+ ret = trace_seq_printf(s, "K ");
+ break;
+ case KMEMTRACE_TYPE_CACHE:
+ ret = trace_seq_printf(s, "C ");
+ break;
+ case KMEMTRACE_TYPE_PAGES:
+ ret = trace_seq_printf(s, "P ");
+ break;
+ default:
+ ret = trace_seq_printf(s, "? ");
+ }
+
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ /* Requested */
+ ret = trace_seq_printf(s, "%4zd ", entry->bytes_req);
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ /* Allocated */
+ ret = trace_seq_printf(s, "%4zd ", entry->bytes_alloc);
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ /* Flags
+ * TODO: would be better to see the name of the GFP flag names
+ */
+ ret = trace_seq_printf(s, "%08x ", entry->gfp_flags);
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ /* Pointer to allocated */
+ ret = trace_seq_printf(s, "0x%tx ", (ptrdiff_t)entry->ptr);
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ /* Node */
+ ret = trace_seq_printf(s, "%4d ", entry->node);
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ /* Call site */
+ ret = seq_print_ip_sym(s, entry->call_site, 0);
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ if (!trace_seq_printf(s, "\n"))
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ return TRACE_TYPE_HANDLED;
+}
+
+static enum print_line_t
+kmemtrace_print_free_compress(struct trace_iterator *iter,
+ struct kmemtrace_free_entry *entry)
+{
+ struct trace_seq *s = &iter->seq;
+ int ret;
+
+ /* Free entry */
+ ret = trace_seq_printf(s, " - ");
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ /* Type */
+ switch (entry->type_id) {
+ case KMEMTRACE_TYPE_KMALLOC:
+ ret = trace_seq_printf(s, "K ");
+ break;
+ case KMEMTRACE_TYPE_CACHE:
+ ret = trace_seq_printf(s, "C ");
+ break;
+ case KMEMTRACE_TYPE_PAGES:
+ ret = trace_seq_printf(s, "P ");
+ break;
+ default:
+ ret = trace_seq_printf(s, "? ");
+ }
+
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ /* Skip requested/allocated/flags */
+ ret = trace_seq_printf(s, " ");
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ /* Pointer to allocated */
+ ret = trace_seq_printf(s, "0x%tx ", (ptrdiff_t)entry->ptr);
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ /* Skip node */
+ ret = trace_seq_printf(s, " ");
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ /* Call site */
+ ret = seq_print_ip_sym(s, entry->call_site, 0);
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ if (!trace_seq_printf(s, "\n"))
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ return TRACE_TYPE_HANDLED;
+}
+
+static enum print_line_t kmemtrace_print_line(struct trace_iterator *iter)
+{
+ struct trace_entry *entry = iter->ent;
+
+ switch (entry->type) {
+ case TRACE_KMEM_ALLOC: {
+ struct kmemtrace_alloc_entry *field;
+ trace_assign_type(field, entry);
+ if (kmem_tracer_flags.val & TRACE_KMEM_OPT_MINIMAL)
+ return kmemtrace_print_alloc_compress(iter, field);
+ else
+ return kmemtrace_print_alloc_original(iter, field);
+ }
+
+ case TRACE_KMEM_FREE: {
+ struct kmemtrace_free_entry *field;
+ trace_assign_type(field, entry);
+ if (kmem_tracer_flags.val & TRACE_KMEM_OPT_MINIMAL)
+ return kmemtrace_print_free_compress(iter, field);
+ else
+ return kmemtrace_print_free_original(iter, field);
+ }
+
+ default:
+ return TRACE_TYPE_UNHANDLED;
+ }
+}
+
+/* Trace allocations */
+void kmemtrace_mark_alloc_node(enum kmemtrace_type_id type_id,
+ unsigned long call_site,
+ const void *ptr,
+ size_t bytes_req,
+ size_t bytes_alloc,
+ gfp_t gfp_flags,
+ int node)
+{
+ struct ring_buffer_event *event;
+ struct kmemtrace_alloc_entry *entry;
+ struct trace_array *tr = kmemtrace_array;
+ unsigned long irq_flags;
+
+ if (!kmem_tracing_enabled)
+ return;
+
+ event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
+ &irq_flags);
+ if (!event)
+ return;
+ entry = ring_buffer_event_data(event);
+ tracing_generic_entry_update(&entry->ent, 0, 0);
+
+ entry->ent.type = TRACE_KMEM_ALLOC;
+ entry->call_site = call_site;
+ entry->ptr = ptr;
+ entry->bytes_req = bytes_req;
+ entry->bytes_alloc = bytes_alloc;
+ entry->gfp_flags = gfp_flags;
+ entry->node = node;
+
+ ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+
+ trace_wake_up();
+}
+EXPORT_SYMBOL(kmemtrace_mark_alloc_node);
+
+void kmemtrace_mark_free(enum kmemtrace_type_id type_id,
+ unsigned long call_site,
+ const void *ptr)
+{
+ struct ring_buffer_event *event;
+ struct kmemtrace_free_entry *entry;
+ struct trace_array *tr = kmemtrace_array;
+ unsigned long irq_flags;
+
+ if (!kmem_tracing_enabled)
+ return;
+
+ event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
+ &irq_flags);
+ if (!event)
+ return;
+ entry = ring_buffer_event_data(event);
+ tracing_generic_entry_update(&entry->ent, 0, 0);
+
+ entry->ent.type = TRACE_KMEM_FREE;
+ entry->type_id = type_id;
+ entry->call_site = call_site;
+ entry->ptr = ptr;
+
+ ring_buffer_unlock_commit(tr->buffer, event, irq_flags);
+
+ trace_wake_up();
+}
+EXPORT_SYMBOL(kmemtrace_mark_free);
+
+static struct tracer kmem_tracer __read_mostly = {
+ .name = "kmemtrace",
+ .init = kmem_trace_init,
+ .reset = kmem_trace_reset,
+ .print_line = kmemtrace_print_line,
+ .print_header = kmemtrace_headers,
+ .flags = &kmem_tracer_flags
+};
+
+void kmemtrace_init(void)
+{
+ /* earliest opportunity to start kmem tracing */
+}
+
+static int __init init_kmem_tracer(void)
+{
+ return register_tracer(&kmem_tracer);
+}
+
+device_initcall(init_kmem_tracer);
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index bd38c5cfd8ad..b36d7374ceef 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -123,8 +123,7 @@ void ring_buffer_normalize_time_stamp(int cpu, u64 *ts)
EXPORT_SYMBOL_GPL(ring_buffer_normalize_time_stamp);
#define RB_EVNT_HDR_SIZE (sizeof(struct ring_buffer_event))
-#define RB_ALIGNMENT_SHIFT 2
-#define RB_ALIGNMENT (1 << RB_ALIGNMENT_SHIFT)
+#define RB_ALIGNMENT 4U
#define RB_MAX_SMALL_DATA 28
enum {
@@ -133,7 +132,7 @@ enum {
};
/* inline for ring buffer fast paths */
-static inline unsigned
+static unsigned
rb_event_length(struct ring_buffer_event *event)
{
unsigned length;
@@ -151,7 +150,7 @@ rb_event_length(struct ring_buffer_event *event)
case RINGBUF_TYPE_DATA:
if (event->len)
- length = event->len << RB_ALIGNMENT_SHIFT;
+ length = event->len * RB_ALIGNMENT;
else
length = event->array[0];
return length + RB_EVNT_HDR_SIZE;
@@ -179,7 +178,7 @@ unsigned ring_buffer_event_length(struct ring_buffer_event *event)
EXPORT_SYMBOL_GPL(ring_buffer_event_length);
/* inline for ring buffer fast paths */
-static inline void *
+static void *
rb_event_data(struct ring_buffer_event *event)
{
BUG_ON(event->type != RINGBUF_TYPE_DATA);
@@ -229,10 +228,9 @@ static void rb_init_page(struct buffer_data_page *bpage)
* Also stolen from mm/slob.c. Thanks to Mathieu Desnoyers for pointing
* this issue out.
*/
-static inline void free_buffer_page(struct buffer_page *bpage)
+static void free_buffer_page(struct buffer_page *bpage)
{
- if (bpage->page)
- free_page((unsigned long)bpage->page);
+ free_page((unsigned long)bpage->page);
kfree(bpage);
}
@@ -811,7 +809,7 @@ rb_event_index(struct ring_buffer_event *event)
return (addr & ~PAGE_MASK) - (PAGE_SIZE - BUF_PAGE_SIZE);
}
-static inline int
+static int
rb_is_commit(struct ring_buffer_per_cpu *cpu_buffer,
struct ring_buffer_event *event)
{
@@ -825,7 +823,7 @@ rb_is_commit(struct ring_buffer_per_cpu *cpu_buffer,
rb_commit_index(cpu_buffer) == index;
}
-static inline void
+static void
rb_set_commit_event(struct ring_buffer_per_cpu *cpu_buffer,
struct ring_buffer_event *event)
{
@@ -850,7 +848,7 @@ rb_set_commit_event(struct ring_buffer_per_cpu *cpu_buffer,
local_set(&cpu_buffer->commit_page->page->commit, index);
}
-static inline void
+static void
rb_set_commit_to_write(struct ring_buffer_per_cpu *cpu_buffer)
{
/*
@@ -896,7 +894,7 @@ static void rb_reset_reader_page(struct ring_buffer_per_cpu *cpu_buffer)
cpu_buffer->reader_page->read = 0;
}
-static inline void rb_inc_iter(struct ring_buffer_iter *iter)
+static void rb_inc_iter(struct ring_buffer_iter *iter)
{
struct ring_buffer_per_cpu *cpu_buffer = iter->cpu_buffer;
@@ -926,7 +924,7 @@ static inline void rb_inc_iter(struct ring_buffer_iter *iter)
* and with this, we can determine what to place into the
* data field.
*/
-static inline void
+static void
rb_update_event(struct ring_buffer_event *event,
unsigned type, unsigned length)
{
@@ -938,15 +936,11 @@ rb_update_event(struct ring_buffer_event *event,
break;
case RINGBUF_TYPE_TIME_EXTEND:
- event->len =
- (RB_LEN_TIME_EXTEND + (RB_ALIGNMENT-1))
- >> RB_ALIGNMENT_SHIFT;
+ event->len = DIV_ROUND_UP(RB_LEN_TIME_EXTEND, RB_ALIGNMENT);
break;
case RINGBUF_TYPE_TIME_STAMP:
- event->len =
- (RB_LEN_TIME_STAMP + (RB_ALIGNMENT-1))
- >> RB_ALIGNMENT_SHIFT;
+ event->len = DIV_ROUND_UP(RB_LEN_TIME_STAMP, RB_ALIGNMENT);
break;
case RINGBUF_TYPE_DATA:
@@ -955,16 +949,14 @@ rb_update_event(struct ring_buffer_event *event,
event->len = 0;
event->array[0] = length;
} else
- event->len =
- (length + (RB_ALIGNMENT-1))
- >> RB_ALIGNMENT_SHIFT;
+ event->len = DIV_ROUND_UP(length, RB_ALIGNMENT);
break;
default:
BUG();
}
}
-static inline unsigned rb_calculate_event_length(unsigned length)
+static unsigned rb_calculate_event_length(unsigned length)
{
struct ring_buffer_event event; /* Used only for sizeof array */
@@ -1438,7 +1430,7 @@ int ring_buffer_write(struct ring_buffer *buffer,
}
EXPORT_SYMBOL_GPL(ring_buffer_write);
-static inline int rb_per_cpu_empty(struct ring_buffer_per_cpu *cpu_buffer)
+static int rb_per_cpu_empty(struct ring_buffer_per_cpu *cpu_buffer)
{
struct buffer_page *reader = cpu_buffer->reader_page;
struct buffer_page *head = cpu_buffer->head_page;
@@ -2277,9 +2269,24 @@ int ring_buffer_swap_cpu(struct ring_buffer *buffer_a,
if (buffer_a->pages != buffer_b->pages)
return -EINVAL;
+ if (ring_buffer_flags != RB_BUFFERS_ON)
+ return -EAGAIN;
+
+ if (atomic_read(&buffer_a->record_disabled))
+ return -EAGAIN;
+
+ if (atomic_read(&buffer_b->record_disabled))
+ return -EAGAIN;
+
cpu_buffer_a = buffer_a->buffers[cpu];
cpu_buffer_b = buffer_b->buffers[cpu];
+ if (atomic_read(&cpu_buffer_a->record_disabled))
+ return -EAGAIN;
+
+ if (atomic_read(&cpu_buffer_b->record_disabled))
+ return -EAGAIN;
+
/*
* We can't do a synchronize_sched here because this
* function can be called in atomic context.
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 17bb88d86ac2..2f8ac1f008f5 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -37,6 +37,7 @@
#include <linux/irqflags.h>
#include "trace.h"
+#include "trace_output.h"
#define TRACE_BUFFER_FLAGS (RB_FL_OVERWRITE)
@@ -186,9 +187,6 @@ int tracing_is_enabled(void)
return tracer_enabled;
}
-/* function tracing enabled */
-int ftrace_function_enabled;
-
/*
* trace_buf_size is the size in bytes that is allocated
* for a buffer. Note, the number of bytes is always rounded
@@ -329,132 +327,6 @@ __update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu)
tracing_record_cmdline(current);
}
-/**
- * trace_seq_printf - sequence printing of trace information
- * @s: trace sequence descriptor
- * @fmt: printf format string
- *
- * The tracer may use either sequence operations or its own
- * copy to user routines. To simplify formating of a trace
- * trace_seq_printf is used to store strings into a special
- * buffer (@s). Then the output may be either used by
- * the sequencer or pulled into another buffer.
- */
-int
-trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
-{
- int len = (PAGE_SIZE - 1) - s->len;
- va_list ap;
- int ret;
-
- if (!len)
- return 0;
-
- va_start(ap, fmt);
- ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
- va_end(ap);
-
- /* If we can't write it all, don't bother writing anything */
- if (ret >= len)
- return 0;
-
- s->len += ret;
-
- return len;
-}
-
-/**
- * trace_seq_puts - trace sequence printing of simple string
- * @s: trace sequence descriptor
- * @str: simple string to record
- *
- * The tracer may use either the sequence operations or its own
- * copy to user routines. This function records a simple string
- * into a special buffer (@s) for later retrieval by a sequencer
- * or other mechanism.
- */
-static int
-trace_seq_puts(struct trace_seq *s, const char *str)
-{
- int len = strlen(str);
-
- if (len > ((PAGE_SIZE - 1) - s->len))
- return 0;
-
- memcpy(s->buffer + s->len, str, len);
- s->len += len;
-
- return len;
-}
-
-static int
-trace_seq_putc(struct trace_seq *s, unsigned char c)
-{
- if (s->len >= (PAGE_SIZE - 1))
- return 0;
-
- s->buffer[s->len++] = c;
-
- return 1;
-}
-
-static int
-trace_seq_putmem(struct trace_seq *s, void *mem, size_t len)
-{
- if (len > ((PAGE_SIZE - 1) - s->len))
- return 0;
-
- memcpy(s->buffer + s->len, mem, len);
- s->len += len;
-
- return len;
-}
-
-#define MAX_MEMHEX_BYTES 8
-#define HEX_CHARS (MAX_MEMHEX_BYTES*2 + 1)
-
-static int
-trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len)
-{
- unsigned char hex[HEX_CHARS];
- unsigned char *data = mem;
- int i, j;
-
-#ifdef __BIG_ENDIAN
- for (i = 0, j = 0; i < len; i++) {
-#else
- for (i = len-1, j = 0; i >= 0; i--) {
-#endif
- hex[j++] = hex_asc_hi(data[i]);
- hex[j++] = hex_asc_lo(data[i]);
- }
- hex[j++] = ' ';
-
- return trace_seq_putmem(s, hex, j);
-}
-
-static int
-trace_seq_path(struct trace_seq *s, struct path *path)
-{
- unsigned char *p;
-
- if (s->len >= (PAGE_SIZE - 1))
- return 0;
- p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
- if (!IS_ERR(p)) {
- p = mangle_path(s->buffer + s->len, p, "\n");
- if (p) {
- s->len = p - s->buffer;
- return 1;
- }
- } else {
- s->buffer[s->len++] = '?';
- return 1;
- }
-
- return 0;
-}
-
static void
trace_seq_reset(struct trace_seq *s)
{
@@ -543,7 +415,7 @@ update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu)
ftrace_enable_cpu();
- WARN_ON_ONCE(ret);
+ WARN_ON_ONCE(ret && ret != -EAGAIN);
__update_max_tr(tr, tsk, cpu);
__raw_spin_unlock(&ftrace_max_lock);
@@ -738,13 +610,12 @@ void tracing_start(void)
return;
spin_lock_irqsave(&tracing_start_lock, flags);
- if (--trace_stop_count)
- goto out;
-
- if (trace_stop_count < 0) {
- /* Someone screwed up their debugging */
- WARN_ON_ONCE(1);
- trace_stop_count = 0;
+ if (--trace_stop_count) {
+ if (trace_stop_count < 0) {
+ /* Someone screwed up their debugging */
+ WARN_ON_ONCE(1);
+ trace_stop_count = 0;
+ }
goto out;
}
@@ -960,10 +831,10 @@ ftrace(struct trace_array *tr, struct trace_array_cpu *data,
trace_function(tr, data, ip, parent_ip, flags, pc);
}
-static void ftrace_trace_stack(struct trace_array *tr,
- struct trace_array_cpu *data,
- unsigned long flags,
- int skip, int pc)
+static void __ftrace_trace_stack(struct trace_array *tr,
+ struct trace_array_cpu *data,
+ unsigned long flags,
+ int skip, int pc)
{
#ifdef CONFIG_STACKTRACE
struct ring_buffer_event *event;
@@ -971,9 +842,6 @@ static void ftrace_trace_stack(struct trace_array *tr,
struct stack_trace trace;
unsigned long irq_flags;
- if (!(trace_flags & TRACE_ITER_STACKTRACE))
- return;
-
event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
&irq_flags);
if (!event)
@@ -994,12 +862,23 @@ static void ftrace_trace_stack(struct trace_array *tr,
#endif
}
+static void ftrace_trace_stack(struct trace_array *tr,
+ struct trace_array_cpu *data,
+ unsigned long flags,
+ int skip, int pc)
+{
+ if (!(trace_flags & TRACE_ITER_STACKTRACE))
+ return;
+
+ __ftrace_trace_stack(tr, data, flags, skip, pc);
+}
+
void __trace_stack(struct trace_array *tr,
struct trace_array_cpu *data,
unsigned long flags,
- int skip)
+ int skip, int pc)
{
- ftrace_trace_stack(tr, data, flags, skip, preempt_count());
+ __ftrace_trace_stack(tr, data, flags, skip, pc);
}
static void ftrace_trace_userstack(struct trace_array *tr,
@@ -1163,65 +1042,6 @@ ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3)
local_irq_restore(flags);
}
-#ifdef CONFIG_FUNCTION_TRACER
-static void
-function_trace_call_preempt_only(unsigned long ip, unsigned long parent_ip)
-{
- struct trace_array *tr = &global_trace;
- struct trace_array_cpu *data;
- unsigned long flags;
- long disabled;
- int cpu, resched;
- int pc;
-
- if (unlikely(!ftrace_function_enabled))
- return;
-
- pc = preempt_count();
- resched = ftrace_preempt_disable();
- local_save_flags(flags);
- cpu = raw_smp_processor_id();
- data = tr->data[cpu];
- disabled = atomic_inc_return(&data->disabled);
-
- if (likely(disabled == 1))
- trace_function(tr, data, ip, parent_ip, flags, pc);
-
- atomic_dec(&data->disabled);
- ftrace_preempt_enable(resched);
-}
-
-static void
-function_trace_call(unsigned long ip, unsigned long parent_ip)
-{
- struct trace_array *tr = &global_trace;
- struct trace_array_cpu *data;
- unsigned long flags;
- long disabled;
- int cpu;
- int pc;
-
- if (unlikely(!ftrace_function_enabled))
- return;
-
- /*
- * Need to use raw, since this must be called before the
- * recursive protection is performed.
- */
- local_irq_save(flags);
- cpu = raw_smp_processor_id();
- data = tr->data[cpu];
- disabled = atomic_inc_return(&data->disabled);
-
- if (likely(disabled == 1)) {
- pc = preempt_count();
- trace_function(tr, data, ip, parent_ip, flags, pc);
- }
-
- atomic_dec(&data->disabled);
- local_irq_restore(flags);
-}
-
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
int trace_graph_entry(struct ftrace_graph_ent *trace)
{
@@ -1279,31 +1099,6 @@ void trace_graph_return(struct ftrace_graph_ret *trace)
}
#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
-static struct ftrace_ops trace_ops __read_mostly =
-{
- .func = function_trace_call,
-};
-
-void tracing_start_function_trace(void)
-{
- ftrace_function_enabled = 0;
-
- if (trace_flags & TRACE_ITER_PREEMPTONLY)
- trace_ops.func = function_trace_call_preempt_only;
- else
- trace_ops.func = function_trace_call;
-
- register_ftrace_function(&trace_ops);
- ftrace_function_enabled = 1;
-}
-
-void tracing_stop_function_trace(void)
-{
- ftrace_function_enabled = 0;
- unregister_ftrace_function(&trace_ops);
-}
-#endif
-
enum trace_file_type {
TRACE_FILE_LAT_FMT = 1,
TRACE_FILE_ANNOTATE = 2,
@@ -1472,154 +1267,6 @@ static void s_stop(struct seq_file *m, void *p)
mutex_unlock(&trace_types_lock);
}
-#ifdef CONFIG_KRETPROBES
-static inline const char *kretprobed(const char *name)
-{
- static const char tramp_name[] = "kretprobe_trampoline";
- int size = sizeof(tramp_name);
-
- if (strncmp(tramp_name, name, size) == 0)
- return "[unknown/kretprobe'd]";
- return name;
-}
-#else
-static inline const char *kretprobed(const char *name)
-{
- return name;
-}
-#endif /* CONFIG_KRETPROBES */
-
-static int
-seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
-{
-#ifdef CONFIG_KALLSYMS
- char str[KSYM_SYMBOL_LEN];
- const char *name;
-
- kallsyms_lookup(address, NULL, NULL, NULL, str);
-
- name = kretprobed(str);
-
- return trace_seq_printf(s, fmt, name);
-#endif
- return 1;
-}
-
-static int
-seq_print_sym_offset(struct trace_seq *s, const char *fmt,
- unsigned long address)
-{
-#ifdef CONFIG_KALLSYMS
- char str[KSYM_SYMBOL_LEN];
- const char *name;
-
- sprint_symbol(str, address);
- name = kretprobed(str);
-
- return trace_seq_printf(s, fmt, name);
-#endif
- return 1;
-}
-
-#ifndef CONFIG_64BIT
-# define IP_FMT "%08lx"
-#else
-# define IP_FMT "%016lx"
-#endif
-
-int
-seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
-{
- int ret;
-
- if (!ip)
- return trace_seq_printf(s, "0");
-
- if (sym_flags & TRACE_ITER_SYM_OFFSET)
- ret = seq_print_sym_offset(s, "%s", ip);
- else
- ret = seq_print_sym_short(s, "%s", ip);
-
- if (!ret)
- return 0;
-
- if (sym_flags & TRACE_ITER_SYM_ADDR)
- ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
- return ret;
-}
-
-static inline int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
- unsigned long ip, unsigned long sym_flags)
-{
- struct file *file = NULL;
- unsigned long vmstart = 0;
- int ret = 1;
-
- if (mm) {
- const struct vm_area_struct *vma;
-
- down_read(&mm->mmap_sem);
- vma = find_vma(mm, ip);
- if (vma) {
- file = vma->vm_file;
- vmstart = vma->vm_start;
- }
- if (file) {
- ret = trace_seq_path(s, &file->f_path);
- if (ret)
- ret = trace_seq_printf(s, "[+0x%lx]", ip - vmstart);
- }
- up_read(&mm->mmap_sem);
- }
- if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
- ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
- return ret;
-}
-
-static int
-seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
- unsigned long sym_flags)
-{
- struct mm_struct *mm = NULL;
- int ret = 1;
- unsigned int i;
-
- if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
- struct task_struct *task;
- /*
- * we do the lookup on the thread group leader,
- * since individual threads might have already quit!
- */
- rcu_read_lock();
- task = find_task_by_vpid(entry->ent.tgid);
- if (task)
- mm = get_task_mm(task);
- rcu_read_unlock();
- }
-
- for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
- unsigned long ip = entry->caller[i];
-
- if (ip == ULONG_MAX || !ret)
- break;
- if (i && ret)
- ret = trace_seq_puts(s, " <- ");
- if (!ip) {
- if (ret)
- ret = trace_seq_puts(s, "??");
- continue;
- }
- if (!ret)
- break;
- if (ret)
- ret = seq_print_user_ip(s, mm, ip, sym_flags);
- }
-
- if (mm)
- mmput(mm);
- return ret;
-}
-
static void print_lat_help_header(struct seq_file *m)
{
seq_puts(m, "# _------=> CPU# \n");
@@ -1755,52 +1402,6 @@ lat_print_timestamp(struct trace_seq *s, u64 abs_usecs,
trace_seq_puts(s, " : ");
}
-static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
-
-static int task_state_char(unsigned long state)
-{
- int bit = state ? __ffs(state) + 1 : 0;
-
- return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
-}
-
-/*
- * The message is supposed to contain an ending newline.
- * If the printing stops prematurely, try to add a newline of our own.
- */
-void trace_seq_print_cont(struct trace_seq *s, struct trace_iterator *iter)
-{
- struct trace_entry *ent;
- struct trace_field_cont *cont;
- bool ok = true;
-
- ent = peek_next_entry(iter, iter->cpu, NULL);
- if (!ent || ent->type != TRACE_CONT) {
- trace_seq_putc(s, '\n');
- return;
- }
-
- do {
- cont = (struct trace_field_cont *)ent;
- if (ok)
- ok = (trace_seq_printf(s, "%s", cont->buf) > 0);
-
- ftrace_disable_cpu();
-
- if (iter->buffer_iter[iter->cpu])
- ring_buffer_read(iter->buffer_iter[iter->cpu], NULL);
- else
- ring_buffer_consume(iter->tr->buffer, iter->cpu, NULL);
-
- ftrace_enable_cpu();
-
- ent = peek_next_entry(iter, iter->cpu, NULL);
- } while (ent && ent->type == TRACE_CONT);
-
- if (!ok)
- trace_seq_putc(s, '\n');
-}
-
static void test_cpu_buff_start(struct trace_iterator *iter)
{
struct trace_seq *s = &iter->seq;
@@ -1824,17 +1425,14 @@ print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu)
struct trace_seq *s = &iter->seq;
unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK);
struct trace_entry *next_entry;
+ struct trace_event *event;
unsigned long verbose = (trace_flags & TRACE_ITER_VERBOSE);
struct trace_entry *entry = iter->ent;
unsigned long abs_usecs;
unsigned long rel_usecs;
u64 next_ts;
char *comm;
- int S, T;
- int i;
-
- if (entry->type == TRACE_CONT)
- return TRACE_TYPE_HANDLED;
+ int ret;
test_cpu_buff_start(iter);
@@ -1859,96 +1457,16 @@ print_lat_fmt(struct trace_iterator *iter, unsigned int trace_idx, int cpu)
lat_print_generic(s, entry, cpu);
lat_print_timestamp(s, abs_usecs, rel_usecs);
}
- switch (entry->type) {
- case TRACE_FN: {
- struct ftrace_entry *field;
-
- trace_assign_type(field, entry);
-
- seq_print_ip_sym(s, field->ip, sym_flags);
- trace_seq_puts(s, " (");
- seq_print_ip_sym(s, field->parent_ip, sym_flags);
- trace_seq_puts(s, ")\n");
- break;
- }
- case TRACE_CTX:
- case TRACE_WAKE: {
- struct ctx_switch_entry *field;
-
- trace_assign_type(field, entry);
-
- T = task_state_char(field->next_state);
- S = task_state_char(field->prev_state);
- comm = trace_find_cmdline(field->next_pid);
- trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
- field->prev_pid,
- field->prev_prio,
- S, entry->type == TRACE_CTX ? "==>" : " +",
- field->next_cpu,
- field->next_pid,
- field->next_prio,
- T, comm);
- break;
- }
- case TRACE_SPECIAL: {
- struct special_entry *field;
-
- trace_assign_type(field, entry);
-
- trace_seq_printf(s, "# %ld %ld %ld\n",
- field->arg1,
- field->arg2,
- field->arg3);
- break;
- }
- case TRACE_STACK: {
- struct stack_entry *field;
-
- trace_assign_type(field, entry);
-
- for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
- if (i)
- trace_seq_puts(s, " <= ");
- seq_print_ip_sym(s, field->caller[i], sym_flags);
- }
- trace_seq_puts(s, "\n");
- break;
- }
- case TRACE_PRINT: {
- struct print_entry *field;
-
- trace_assign_type(field, entry);
- seq_print_ip_sym(s, field->ip, sym_flags);
- trace_seq_printf(s, ": %s", field->buf);
- if (entry->flags & TRACE_FLAG_CONT)
- trace_seq_print_cont(s, iter);
- break;
- }
- case TRACE_BRANCH: {
- struct trace_branch *field;
-
- trace_assign_type(field, entry);
-
- trace_seq_printf(s, "[%s] %s:%s:%d\n",
- field->correct ? " ok " : " MISS ",
- field->func,
- field->file,
- field->line);
- break;
+ event = ftrace_find_event(entry->type);
+ if (event && event->latency_trace) {
+ ret = event->latency_trace(s, entry, sym_flags);
+ if (ret)
+ return ret;
+ return TRACE_TYPE_HANDLED;
}
- case TRACE_USER_STACK: {
- struct userstack_entry *field;
-
- trace_assign_type(field, entry);
- seq_print_userip_objs(field, s, sym_flags);
- trace_seq_putc(s, '\n');
- break;
- }
- default:
- trace_seq_printf(s, "Unknown type %d\n", entry->type);
- }
+ trace_seq_printf(s, "Unknown type %d\n", entry->type);
return TRACE_TYPE_HANDLED;
}
@@ -1957,19 +1475,15 @@ static enum print_line_t print_trace_fmt(struct trace_iterator *iter)
struct trace_seq *s = &iter->seq;
unsigned long sym_flags = (trace_flags & TRACE_ITER_SYM_MASK);
struct trace_entry *entry;
+ struct trace_event *event;
unsigned long usec_rem;
unsigned long long t;
unsigned long secs;
char *comm;
int ret;
- int S, T;
- int i;
entry = iter->ent;
- if (entry->type == TRACE_CONT)
- return TRACE_TYPE_HANDLED;
-
test_cpu_buff_start(iter);
comm = trace_find_cmdline(iter->ent->pid);
@@ -1988,129 +1502,17 @@ static enum print_line_t print_trace_fmt(struct trace_iterator *iter)
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
- switch (entry->type) {
- case TRACE_FN: {
- struct ftrace_entry *field;
-
- trace_assign_type(field, entry);
-
- ret = seq_print_ip_sym(s, field->ip, sym_flags);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- if ((sym_flags & TRACE_ITER_PRINT_PARENT) &&
- field->parent_ip) {
- ret = trace_seq_printf(s, " <-");
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- ret = seq_print_ip_sym(s,
- field->parent_ip,
- sym_flags);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- }
- ret = trace_seq_printf(s, "\n");
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- break;
- }
- case TRACE_CTX:
- case TRACE_WAKE: {
- struct ctx_switch_entry *field;
-
- trace_assign_type(field, entry);
-
- T = task_state_char(field->next_state);
- S = task_state_char(field->prev_state);
- ret = trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c\n",
- field->prev_pid,
- field->prev_prio,
- S,
- entry->type == TRACE_CTX ? "==>" : " +",
- field->next_cpu,
- field->next_pid,
- field->next_prio,
- T);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- break;
- }
- case TRACE_SPECIAL: {
- struct special_entry *field;
-
- trace_assign_type(field, entry);
-
- ret = trace_seq_printf(s, "# %ld %ld %ld\n",
- field->arg1,
- field->arg2,
- field->arg3);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- break;
- }
- case TRACE_STACK: {
- struct stack_entry *field;
-
- trace_assign_type(field, entry);
-
- for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
- if (i) {
- ret = trace_seq_puts(s, " <= ");
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- }
- ret = seq_print_ip_sym(s, field->caller[i],
- sym_flags);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- }
- ret = trace_seq_puts(s, "\n");
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- break;
- }
- case TRACE_PRINT: {
- struct print_entry *field;
-
- trace_assign_type(field, entry);
-
- seq_print_ip_sym(s, field->ip, sym_flags);
- trace_seq_printf(s, ": %s", field->buf);
- if (entry->flags & TRACE_FLAG_CONT)
- trace_seq_print_cont(s, iter);
- break;
- }
- case TRACE_GRAPH_RET: {
- return print_graph_function(iter);
- }
- case TRACE_GRAPH_ENT: {
- return print_graph_function(iter);
- }
- case TRACE_BRANCH: {
- struct trace_branch *field;
-
- trace_assign_type(field, entry);
-
- trace_seq_printf(s, "[%s] %s:%s:%d\n",
- field->correct ? " ok " : " MISS ",
- field->func,
- field->file,
- field->line);
- break;
+ event = ftrace_find_event(entry->type);
+ if (event && event->trace) {
+ ret = event->trace(s, entry, sym_flags);
+ if (ret)
+ return ret;
+ return TRACE_TYPE_HANDLED;
}
- case TRACE_USER_STACK: {
- struct userstack_entry *field;
-
- trace_assign_type(field, entry);
+ ret = trace_seq_printf(s, "Unknown type %d\n", entry->type);
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
- ret = seq_print_userip_objs(field, s, sym_flags);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- ret = trace_seq_putc(s, '\n');
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- break;
- }
- }
return TRACE_TYPE_HANDLED;
}
@@ -2118,152 +1520,47 @@ static enum print_line_t print_raw_fmt(struct trace_iterator *iter)
{
struct trace_seq *s = &iter->seq;
struct trace_entry *entry;
+ struct trace_event *event;
int ret;
- int S, T;
entry = iter->ent;
- if (entry->type == TRACE_CONT)
- return TRACE_TYPE_HANDLED;
-
ret = trace_seq_printf(s, "%d %d %llu ",
entry->pid, iter->cpu, iter->ts);
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
- switch (entry->type) {
- case TRACE_FN: {
- struct ftrace_entry *field;
-
- trace_assign_type(field, entry);
-
- ret = trace_seq_printf(s, "%x %x\n",
- field->ip,
- field->parent_ip);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- break;
- }
- case TRACE_CTX:
- case TRACE_WAKE: {
- struct ctx_switch_entry *field;
-
- trace_assign_type(field, entry);
-
- T = task_state_char(field->next_state);
- S = entry->type == TRACE_WAKE ? '+' :
- task_state_char(field->prev_state);
- ret = trace_seq_printf(s, "%d %d %c %d %d %d %c\n",
- field->prev_pid,
- field->prev_prio,
- S,
- field->next_cpu,
- field->next_pid,
- field->next_prio,
- T);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- break;
- }
- case TRACE_SPECIAL:
- case TRACE_USER_STACK:
- case TRACE_STACK: {
- struct special_entry *field;
-
- trace_assign_type(field, entry);
-
- ret = trace_seq_printf(s, "# %ld %ld %ld\n",
- field->arg1,
- field->arg2,
- field->arg3);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- break;
+ event = ftrace_find_event(entry->type);
+ if (event && event->raw) {
+ ret = event->raw(s, entry, 0);
+ if (ret)
+ return ret;
+ return TRACE_TYPE_HANDLED;
}
- case TRACE_PRINT: {
- struct print_entry *field;
-
- trace_assign_type(field, entry);
+ ret = trace_seq_printf(s, "%d ?\n", entry->type);
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
- trace_seq_printf(s, "# %lx %s", field->ip, field->buf);
- if (entry->flags & TRACE_FLAG_CONT)
- trace_seq_print_cont(s, iter);
- break;
- }
- }
return TRACE_TYPE_HANDLED;
}
-#define SEQ_PUT_FIELD_RET(s, x) \
-do { \
- if (!trace_seq_putmem(s, &(x), sizeof(x))) \
- return 0; \
-} while (0)
-
-#define SEQ_PUT_HEX_FIELD_RET(s, x) \
-do { \
- BUILD_BUG_ON(sizeof(x) > MAX_MEMHEX_BYTES); \
- if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \
- return 0; \
-} while (0)
-
static enum print_line_t print_hex_fmt(struct trace_iterator *iter)
{
struct trace_seq *s = &iter->seq;
unsigned char newline = '\n';
struct trace_entry *entry;
- int S, T;
+ struct trace_event *event;
entry = iter->ent;
- if (entry->type == TRACE_CONT)
- return TRACE_TYPE_HANDLED;
-
SEQ_PUT_HEX_FIELD_RET(s, entry->pid);
SEQ_PUT_HEX_FIELD_RET(s, iter->cpu);
SEQ_PUT_HEX_FIELD_RET(s, iter->ts);
- switch (entry->type) {
- case TRACE_FN: {
- struct ftrace_entry *field;
-
- trace_assign_type(field, entry);
+ event = ftrace_find_event(entry->type);
+ if (event && event->hex)
+ event->hex(s, entry, 0);
- SEQ_PUT_HEX_FIELD_RET(s, field->ip);
- SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
- break;
- }
- case TRACE_CTX:
- case TRACE_WAKE: {
- struct ctx_switch_entry *field;
-
- trace_assign_type(field, entry);
-
- T = task_state_char(field->next_state);
- S = entry->type == TRACE_WAKE ? '+' :
- task_state_char(field->prev_state);
- SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
- SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
- SEQ_PUT_HEX_FIELD_RET(s, S);
- SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
- SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
- SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
- SEQ_PUT_HEX_FIELD_RET(s, T);
- break;
- }
- case TRACE_SPECIAL:
- case TRACE_USER_STACK:
- case TRACE_STACK: {
- struct special_entry *field;
-
- trace_assign_type(field, entry);
-
- SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
- SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
- SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
- break;
- }
- }
SEQ_PUT_FIELD_RET(s, newline);
return TRACE_TYPE_HANDLED;
@@ -2282,9 +1579,6 @@ static enum print_line_t print_printk_msg_only(struct trace_iterator *iter)
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
- if (entry->flags & TRACE_FLAG_CONT)
- trace_seq_print_cont(s, iter);
-
return TRACE_TYPE_HANDLED;
}
@@ -2292,53 +1586,19 @@ static enum print_line_t print_bin_fmt(struct trace_iterator *iter)
{
struct trace_seq *s = &iter->seq;
struct trace_entry *entry;
+ struct trace_event *event;
entry = iter->ent;
- if (entry->type == TRACE_CONT)
- return TRACE_TYPE_HANDLED;
-
SEQ_PUT_FIELD_RET(s, entry->pid);
SEQ_PUT_FIELD_RET(s, entry->cpu);
SEQ_PUT_FIELD_RET(s, iter->ts);
- switch (entry->type) {
- case TRACE_FN: {
- struct ftrace_entry *field;
-
- trace_assign_type(field, entry);
-
- SEQ_PUT_FIELD_RET(s, field->ip);
- SEQ_PUT_FIELD_RET(s, field->parent_ip);
- break;
- }
- case TRACE_CTX: {
- struct ctx_switch_entry *field;
-
- trace_assign_type(field, entry);
+ event = ftrace_find_event(entry->type);
+ if (event && event->binary)
+ event->binary(s, entry, 0);
- SEQ_PUT_FIELD_RET(s, field->prev_pid);
- SEQ_PUT_FIELD_RET(s, field->prev_prio);
- SEQ_PUT_FIELD_RET(s, field->prev_state);
- SEQ_PUT_FIELD_RET(s, field->next_pid);
- SEQ_PUT_FIELD_RET(s, field->next_prio);
- SEQ_PUT_FIELD_RET(s, field->next_state);
- break;
- }
- case TRACE_SPECIAL:
- case TRACE_USER_STACK:
- case TRACE_STACK: {
- struct special_entry *field;
-
- trace_assign_type(field, entry);
-
- SEQ_PUT_FIELD_RET(s, field->arg1);
- SEQ_PUT_FIELD_RET(s, field->arg2);
- SEQ_PUT_FIELD_RET(s, field->arg3);
- break;
- }
- }
- return 1;
+ return TRACE_TYPE_HANDLED;
}
static int trace_empty(struct trace_iterator *iter)
@@ -3691,6 +2951,15 @@ int __ftrace_printk(unsigned long ip, const char *fmt, ...)
}
EXPORT_SYMBOL_GPL(__ftrace_printk);
+int __ftrace_vprintk(unsigned long ip, const char *fmt, va_list ap)
+{
+ if (!(trace_flags & TRACE_ITER_PRINTK))
+ return 0;
+
+ return trace_vprintk(ip, task_curr_ret_stack(current), fmt, ap);
+}
+EXPORT_SYMBOL_GPL(__ftrace_vprintk);
+
static int trace_panic_handler(struct notifier_block *this,
unsigned long event, void *unused)
{
@@ -3878,7 +3147,6 @@ __init static int tracer_alloc_buffers(void)
#else
current_trace = &nop_trace;
#endif
-
/* All seems OK, enable tracing */
tracing_disabled = 0;
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 4d3d381bfd95..e603a291134b 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -9,6 +9,7 @@
#include <linux/mmiotrace.h>
#include <linux/ftrace.h>
#include <trace/boot.h>
+#include <trace/kmemtrace.h>
enum trace_type {
__TRACE_FIRST_TYPE = 0,
@@ -16,7 +17,6 @@ enum trace_type {
TRACE_FN,
TRACE_CTX,
TRACE_WAKE,
- TRACE_CONT,
TRACE_STACK,
TRACE_PRINT,
TRACE_SPECIAL,
@@ -29,9 +29,12 @@ enum trace_type {
TRACE_GRAPH_ENT,
TRACE_USER_STACK,
TRACE_HW_BRANCHES,
+ TRACE_KMEM_ALLOC,
+ TRACE_KMEM_FREE,
TRACE_POWER,
+ TRACE_BLK,
- __TRACE_LAST_TYPE
+ __TRACE_LAST_TYPE,
};
/*
@@ -170,6 +173,24 @@ struct trace_power {
struct power_trace state_data;
};
+struct kmemtrace_alloc_entry {
+ struct trace_entry ent;
+ enum kmemtrace_type_id type_id;
+ unsigned long call_site;
+ const void *ptr;
+ size_t bytes_req;
+ size_t bytes_alloc;
+ gfp_t gfp_flags;
+ int node;
+};
+
+struct kmemtrace_free_entry {
+ struct trace_entry ent;
+ enum kmemtrace_type_id type_id;
+ unsigned long call_site;
+ const void *ptr;
+};
+
/*
* trace_flag_type is an enumeration that holds different
* states when a trace occurs. These are:
@@ -178,7 +199,6 @@ struct trace_power {
* NEED_RESCED - reschedule is requested
* HARDIRQ - inside an interrupt handler
* SOFTIRQ - inside a softirq handler
- * CONT - multiple entries hold the trace item
*/
enum trace_flag_type {
TRACE_FLAG_IRQS_OFF = 0x01,
@@ -186,7 +206,6 @@ enum trace_flag_type {
TRACE_FLAG_NEED_RESCHED = 0x04,
TRACE_FLAG_HARDIRQ = 0x08,
TRACE_FLAG_SOFTIRQ = 0x10,
- TRACE_FLAG_CONT = 0x20,
};
#define TRACE_BUF_SIZE 1024
@@ -262,7 +281,6 @@ extern void __ftrace_bad_type(void);
do { \
IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
- IF_ASSIGN(var, ent, struct trace_field_cont, TRACE_CONT); \
IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
@@ -280,6 +298,10 @@ extern void __ftrace_bad_type(void);
TRACE_GRAPH_RET); \
IF_ASSIGN(var, ent, struct hw_branch_entry, TRACE_HW_BRANCHES);\
IF_ASSIGN(var, ent, struct trace_power, TRACE_POWER); \
+ IF_ASSIGN(var, ent, struct kmemtrace_alloc_entry, \
+ TRACE_KMEM_ALLOC); \
+ IF_ASSIGN(var, ent, struct kmemtrace_free_entry, \
+ TRACE_KMEM_FREE); \
__ftrace_bad_type(); \
} while (0)
@@ -313,6 +335,7 @@ struct tracer_flags {
/* Makes more easy to define a tracer opt */
#define TRACER_OPT(s, b) .name = #s, .bit = b
+
/*
* A specific tracer, represented by methods that operate on a trace array:
*/
@@ -340,6 +363,7 @@ struct tracer {
struct tracer *next;
int print_max;
struct tracer_flags *flags;
+ struct tracer_stat *stats;
};
struct trace_seq {
@@ -415,7 +439,6 @@ void trace_function(struct trace_array *tr,
void trace_graph_return(struct ftrace_graph_ret *trace);
int trace_graph_entry(struct ftrace_graph_ent *trace);
-void trace_hw_branch(struct trace_array *tr, u64 from, u64 to);
void tracing_start_cmdline_record(void);
void tracing_stop_cmdline_record(void);
@@ -434,15 +457,12 @@ void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
void update_max_tr_single(struct trace_array *tr,
struct task_struct *tsk, int cpu);
-extern cycle_t ftrace_now(int cpu);
+void __trace_stack(struct trace_array *tr,
+ struct trace_array_cpu *data,
+ unsigned long flags,
+ int skip, int pc);
-#ifdef CONFIG_FUNCTION_TRACER
-void tracing_start_function_trace(void);
-void tracing_stop_function_trace(void);
-#else
-# define tracing_start_function_trace() do { } while (0)
-# define tracing_stop_function_trace() do { } while (0)
-#endif
+extern cycle_t ftrace_now(int cpu);
#ifdef CONFIG_CONTEXT_SWITCH_TRACER
typedef void
@@ -456,10 +476,10 @@ struct tracer_switch_ops {
void *private;
struct tracer_switch_ops *next;
};
-
-char *trace_find_cmdline(int pid);
#endif /* CONFIG_CONTEXT_SWITCH_TRACER */
+extern char *trace_find_cmdline(int pid);
+
#ifdef CONFIG_DYNAMIC_FTRACE
extern unsigned long ftrace_update_tot_cnt;
#define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
@@ -488,15 +508,6 @@ extern int trace_selftest_startup_branch(struct tracer *trace,
#endif /* CONFIG_FTRACE_STARTUP_TEST */
extern void *head_page(struct trace_array_cpu *data);
-extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...);
-extern void trace_seq_print_cont(struct trace_seq *s,
- struct trace_iterator *iter);
-
-extern int
-seq_print_ip_sym(struct trace_seq *s, unsigned long ip,
- unsigned long sym_flags);
-extern ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
- size_t cnt);
extern long ns2usecs(cycle_t nsec);
extern int
trace_vprintk(unsigned long ip, int depth, const char *fmt, va_list args);
diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c
index 366c8c333e13..0e94b3d091f7 100644
--- a/kernel/trace/trace_boot.c
+++ b/kernel/trace/trace_boot.c
@@ -11,6 +11,7 @@
#include <linux/kallsyms.h>
#include "trace.h"
+#include "trace_output.h"
static struct trace_array *boot_trace;
static bool pre_initcalls_finished;
diff --git a/kernel/trace/trace_branch.c b/kernel/trace/trace_branch.c
index 6c00feb3bac7..ca017e0a9a27 100644
--- a/kernel/trace/trace_branch.c
+++ b/kernel/trace/trace_branch.c
@@ -14,12 +14,17 @@
#include <linux/hash.h>
#include <linux/fs.h>
#include <asm/local.h>
+
#include "trace.h"
+#include "trace_stat.h"
+#include "trace_output.h"
#ifdef CONFIG_BRANCH_TRACER
+static struct tracer branch_trace;
static int branch_tracing_enabled __read_mostly;
static DEFINE_MUTEX(branch_tracing_mutex);
+
static struct trace_array *branch_tracer;
static void
@@ -142,22 +147,74 @@ static void branch_trace_reset(struct trace_array *tr)
stop_branch_trace(tr);
}
-struct tracer branch_trace __read_mostly =
+static int
+trace_print_print(struct trace_seq *s, struct trace_entry *entry, int flags)
+{
+ struct print_entry *field;
+
+ trace_assign_type(field, entry);
+
+ if (seq_print_ip_sym(s, field->ip, flags))
+ goto partial;
+
+ if (trace_seq_printf(s, ": %s", field->buf))
+ goto partial;
+
+ partial:
+ return TRACE_TYPE_PARTIAL_LINE;
+}
+
+static int
+trace_branch_print(struct trace_seq *s, struct trace_entry *entry, int flags)
+{
+ struct trace_branch *field;
+
+ trace_assign_type(field, entry);
+
+ if (trace_seq_printf(s, "[%s] %s:%s:%d\n",
+ field->correct ? " ok " : " MISS ",
+ field->func,
+ field->file,
+ field->line))
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ return 0;
+}
+
+
+static struct trace_event trace_branch_event = {
+ .type = TRACE_BRANCH,
+ .trace = trace_branch_print,
+ .latency_trace = trace_branch_print,
+ .raw = trace_nop_print,
+ .hex = trace_nop_print,
+ .binary = trace_nop_print,
+};
+
+static struct tracer branch_trace __read_mostly =
{
.name = "branch",
.init = branch_trace_init,
.reset = branch_trace_reset,
#ifdef CONFIG_FTRACE_SELFTEST
.selftest = trace_selftest_startup_branch,
-#endif
+#endif /* CONFIG_FTRACE_SELFTEST */
};
-__init static int init_branch_trace(void)
+__init static int init_branch_tracer(void)
{
+ int ret;
+
+ ret = register_ftrace_event(&trace_branch_event);
+ if (!ret) {
+ printk(KERN_WARNING "Warning: could not register "
+ "branch events\n");
+ return 1;
+ }
return register_tracer(&branch_trace);
}
+device_initcall(init_branch_tracer);
-device_initcall(init_branch_trace);
#else
static inline
void trace_likely_condition(struct ftrace_branch_data *f, int val, int expect)
@@ -183,66 +240,39 @@ void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect)
}
EXPORT_SYMBOL(ftrace_likely_update);
-struct ftrace_pointer {
- void *start;
- void *stop;
- int hit;
-};
+extern unsigned long __start_annotated_branch_profile[];
+extern unsigned long __stop_annotated_branch_profile[];
-static void *
-t_next(struct seq_file *m, void *v, loff_t *pos)
+static int annotated_branch_stat_headers(struct seq_file *m)
{
- const struct ftrace_pointer *f = m->private;
- struct ftrace_branch_data *p = v;
-
- (*pos)++;
-
- if (v == (void *)1)
- return f->start;
-
- ++p;
-
- if ((void *)p >= (void *)f->stop)
- return NULL;
-
- return p;
+ seq_printf(m, " correct incorrect %% ");
+ seq_printf(m, " Function "
+ " File Line\n"
+ " ------- --------- - "
+ " -------- "
+ " ---- ----\n");
+ return 0;
}
-static void *t_start(struct seq_file *m, loff_t *pos)
+static inline long get_incorrect_percent(struct ftrace_branch_data *p)
{
- void *t = (void *)1;
- loff_t l = 0;
-
- for (; t && l < *pos; t = t_next(m, t, &l))
- ;
+ long percent;
- return t;
-}
+ if (p->correct) {
+ percent = p->incorrect * 100;
+ percent /= p->correct + p->incorrect;
+ } else
+ percent = p->incorrect ? 100 : -1;
-static void t_stop(struct seq_file *m, void *p)
-{
+ return percent;
}
-static int t_show(struct seq_file *m, void *v)
+static int branch_stat_show(struct seq_file *m, void *v)
{
- const struct ftrace_pointer *fp = m->private;
struct ftrace_branch_data *p = v;
const char *f;
long percent;
- if (v == (void *)1) {
- if (fp->hit)
- seq_printf(m, " miss hit %% ");
- else
- seq_printf(m, " correct incorrect %% ");
- seq_printf(m, " Function "
- " File Line\n"
- " ------- --------- - "
- " -------- "
- " ---- ----\n");
- return 0;
- }
-
/* Only print the file, not the path */
f = p->file + strlen(p->file);
while (f >= p->file && *f != '/')
@@ -252,11 +282,7 @@ static int t_show(struct seq_file *m, void *v)
/*
* The miss is overlayed on correct, and hit on incorrect.
*/
- if (p->correct) {
- percent = p->incorrect * 100;
- percent /= p->correct + p->incorrect;
- } else
- percent = p->incorrect ? 100 : -1;
+ percent = get_incorrect_percent(p);
seq_printf(m, "%8lu %8lu ", p->correct, p->incorrect);
if (percent < 0)
@@ -267,76 +293,118 @@ static int t_show(struct seq_file *m, void *v)
return 0;
}
-static struct seq_operations tracing_likely_seq_ops = {
- .start = t_start,
- .next = t_next,
- .stop = t_stop,
- .show = t_show,
+static void *annotated_branch_stat_start(void)
+{
+ return __start_annotated_branch_profile;
+}
+
+static void *
+annotated_branch_stat_next(void *v, int idx)
+{
+ struct ftrace_branch_data *p = v;
+
+ ++p;
+
+ if ((void *)p >= (void *)__stop_annotated_branch_profile)
+ return NULL;
+
+ return p;
+}
+
+static int annotated_branch_stat_cmp(void *p1, void *p2)
+{
+ struct ftrace_branch_data *a = p1;
+ struct ftrace_branch_data *b = p2;
+
+ long percent_a, percent_b;
+
+ percent_a = get_incorrect_percent(a);
+ percent_b = get_incorrect_percent(b);
+
+ if (percent_a < percent_b)
+ return -1;
+ if (percent_a > percent_b)
+ return 1;
+ else
+ return 0;
+}
+
+static struct tracer_stat annotated_branch_stats = {
+ .name = "branch_annotated",
+ .stat_start = annotated_branch_stat_start,
+ .stat_next = annotated_branch_stat_next,
+ .stat_cmp = annotated_branch_stat_cmp,
+ .stat_headers = annotated_branch_stat_headers,
+ .stat_show = branch_stat_show
};
-static int tracing_branch_open(struct inode *inode, struct file *file)
+__init static int init_annotated_branch_stats(void)
{
int ret;
- ret = seq_open(file, &tracing_likely_seq_ops);
+ ret = register_stat_tracer(&annotated_branch_stats);
if (!ret) {
- struct seq_file *m = file->private_data;
- m->private = (void *)inode->i_private;
+ printk(KERN_WARNING "Warning: could not register "
+ "annotated branches stats\n");
+ return 1;
}
-
- return ret;
+ return 0;
}
-
-static const struct file_operations tracing_branch_fops = {
- .open = tracing_branch_open,
- .read = seq_read,
- .llseek = seq_lseek,
-};
+fs_initcall(init_annotated_branch_stats);
#ifdef CONFIG_PROFILE_ALL_BRANCHES
+
extern unsigned long __start_branch_profile[];
extern unsigned long __stop_branch_profile[];
-static const struct ftrace_pointer ftrace_branch_pos = {
- .start = __start_branch_profile,
- .stop = __stop_branch_profile,
- .hit = 1,
-};
+static int all_branch_stat_headers(struct seq_file *m)
+{
+ seq_printf(m, " miss hit %% ");
+ seq_printf(m, " Function "
+ " File Line\n"
+ " ------- --------- - "
+ " -------- "
+ " ---- ----\n");
+ return 0;
+}
-#endif /* CONFIG_PROFILE_ALL_BRANCHES */
+static void *all_branch_stat_start(void)
+{
+ return __start_branch_profile;
+}
-extern unsigned long __start_annotated_branch_profile[];
-extern unsigned long __stop_annotated_branch_profile[];
+static void *
+all_branch_stat_next(void *v, int idx)
+{
+ struct ftrace_branch_data *p = v;
-static const struct ftrace_pointer ftrace_annotated_branch_pos = {
- .start = __start_annotated_branch_profile,
- .stop = __stop_annotated_branch_profile,
-};
+ ++p;
-static __init int ftrace_branch_init(void)
-{
- struct dentry *d_tracer;
- struct dentry *entry;
+ if ((void *)p >= (void *)__stop_branch_profile)
+ return NULL;
- d_tracer = tracing_init_dentry();
+ return p;
+}
- entry = debugfs_create_file("profile_annotated_branch", 0444, d_tracer,
- (void *)&ftrace_annotated_branch_pos,
- &tracing_branch_fops);
- if (!entry)
- pr_warning("Could not create debugfs "
- "'profile_annotatet_branch' entry\n");
+static struct tracer_stat all_branch_stats = {
+ .name = "branch_all",
+ .stat_start = all_branch_stat_start,
+ .stat_next = all_branch_stat_next,
+ .stat_headers = all_branch_stat_headers,
+ .stat_show = branch_stat_show
+};
-#ifdef CONFIG_PROFILE_ALL_BRANCHES
- entry = debugfs_create_file("profile_branch", 0444, d_tracer,
- (void *)&ftrace_branch_pos,
- &tracing_branch_fops);
- if (!entry)
- pr_warning("Could not create debugfs"
- " 'profile_branch' entry\n");
-#endif
+__init static int all_annotated_branch_stats(void)
+{
+ int ret;
+ ret = register_stat_tracer(&all_branch_stats);
+ if (!ret) {
+ printk(KERN_WARNING "Warning: could not register "
+ "all branches stats\n");
+ return 1;
+ }
return 0;
}
-
-device_initcall(ftrace_branch_init);
+fs_initcall(all_annotated_branch_stats);
+#endif /* CONFIG_PROFILE_ALL_BRANCHES */
diff --git a/kernel/trace/trace_functions.c b/kernel/trace/trace_functions.c
index 9236d7e25a16..b3a320f8aba7 100644
--- a/kernel/trace/trace_functions.c
+++ b/kernel/trace/trace_functions.c
@@ -16,8 +16,17 @@
#include "trace.h"
+/* function tracing enabled */
+static int ftrace_function_enabled;
+
+static struct trace_array *func_trace;
+
+static void tracing_start_function_trace(void);
+static void tracing_stop_function_trace(void);
+
static void start_function_trace(struct trace_array *tr)
{
+ func_trace = tr;
tr->cpu = get_cpu();
tracing_reset_online_cpus(tr);
put_cpu();
@@ -48,14 +57,188 @@ static void function_trace_start(struct trace_array *tr)
tracing_reset_online_cpus(tr);
}
+static void
+function_trace_call_preempt_only(unsigned long ip, unsigned long parent_ip)
+{
+ struct trace_array *tr = func_trace;
+ struct trace_array_cpu *data;
+ unsigned long flags;
+ long disabled;
+ int cpu, resched;
+ int pc;
+
+ if (unlikely(!ftrace_function_enabled))
+ return;
+
+ pc = preempt_count();
+ resched = ftrace_preempt_disable();
+ local_save_flags(flags);
+ cpu = raw_smp_processor_id();
+ data = tr->data[cpu];
+ disabled = atomic_inc_return(&data->disabled);
+
+ if (likely(disabled == 1))
+ trace_function(tr, data, ip, parent_ip, flags, pc);
+
+ atomic_dec(&data->disabled);
+ ftrace_preempt_enable(resched);
+}
+
+static void
+function_trace_call(unsigned long ip, unsigned long parent_ip)
+{
+ struct trace_array *tr = func_trace;
+ struct trace_array_cpu *data;
+ unsigned long flags;
+ long disabled;
+ int cpu;
+ int pc;
+
+ if (unlikely(!ftrace_function_enabled))
+ return;
+
+ /*
+ * Need to use raw, since this must be called before the
+ * recursive protection is performed.
+ */
+ local_irq_save(flags);
+ cpu = raw_smp_processor_id();
+ data = tr->data[cpu];
+ disabled = atomic_inc_return(&data->disabled);
+
+ if (likely(disabled == 1)) {
+ pc = preempt_count();
+ trace_function(tr, data, ip, parent_ip, flags, pc);
+ }
+
+ atomic_dec(&data->disabled);
+ local_irq_restore(flags);
+}
+
+static void
+function_stack_trace_call(unsigned long ip, unsigned long parent_ip)
+{
+ struct trace_array *tr = func_trace;
+ struct trace_array_cpu *data;
+ unsigned long flags;
+ long disabled;
+ int cpu;
+ int pc;
+
+ if (unlikely(!ftrace_function_enabled))
+ return;
+
+ /*
+ * Need to use raw, since this must be called before the
+ * recursive protection is performed.
+ */
+ local_irq_save(flags);
+ cpu = raw_smp_processor_id();
+ data = tr->data[cpu];
+ disabled = atomic_inc_return(&data->disabled);
+
+ if (likely(disabled == 1)) {
+ pc = preempt_count();
+ trace_function(tr, data, ip, parent_ip, flags, pc);
+ /*
+ * skip over 5 funcs:
+ * __ftrace_trace_stack,
+ * __trace_stack,
+ * function_stack_trace_call
+ * ftrace_list_func
+ * ftrace_call
+ */
+ __trace_stack(tr, data, flags, 5, pc);
+ }
+
+ atomic_dec(&data->disabled);
+ local_irq_restore(flags);
+}
+
+
+static struct ftrace_ops trace_ops __read_mostly =
+{
+ .func = function_trace_call,
+};
+
+static struct ftrace_ops trace_stack_ops __read_mostly =
+{
+ .func = function_stack_trace_call,
+};
+
+/* Our two options */
+enum {
+ TRACE_FUNC_OPT_STACK = 0x1,
+};
+
+static struct tracer_opt func_opts[] = {
+#ifdef CONFIG_STACKTRACE
+ { TRACER_OPT(func_stack_trace, TRACE_FUNC_OPT_STACK) },
+#endif
+ { } /* Always set a last empty entry */
+};
+
+static struct tracer_flags func_flags = {
+ .val = 0, /* By default: all flags disabled */
+ .opts = func_opts
+};
+
+static void tracing_start_function_trace(void)
+{
+ ftrace_function_enabled = 0;
+
+ if (trace_flags & TRACE_ITER_PREEMPTONLY)
+ trace_ops.func = function_trace_call_preempt_only;
+ else
+ trace_ops.func = function_trace_call;
+
+ if (func_flags.val & TRACE_FUNC_OPT_STACK)
+ register_ftrace_function(&trace_stack_ops);
+ else
+ register_ftrace_function(&trace_ops);
+
+ ftrace_function_enabled = 1;
+}
+
+static void tracing_stop_function_trace(void)
+{
+ ftrace_function_enabled = 0;
+ /* OK if they are not registered */
+ unregister_ftrace_function(&trace_stack_ops);
+ unregister_ftrace_function(&trace_ops);
+}
+
+static int func_set_flag(u32 old_flags, u32 bit, int set)
+{
+ if (bit == TRACE_FUNC_OPT_STACK) {
+ /* do nothing if already set */
+ if (!!set == !!(func_flags.val & TRACE_FUNC_OPT_STACK))
+ return 0;
+
+ if (set) {
+ unregister_ftrace_function(&trace_ops);
+ register_ftrace_function(&trace_stack_ops);
+ } else {
+ unregister_ftrace_function(&trace_stack_ops);
+ register_ftrace_function(&trace_ops);
+ }
+
+ return 0;
+ }
+
+ return -EINVAL;
+}
+
static struct tracer function_trace __read_mostly =
{
- .name = "function",
- .init = function_trace_init,
- .reset = function_trace_reset,
- .start = function_trace_start,
+ .name = "function",
+ .init = function_trace_init,
+ .reset = function_trace_reset,
+ .start = function_trace_start,
+ .flags = &func_flags,
+ .set_flag = func_set_flag,
#ifdef CONFIG_FTRACE_SELFTEST
- .selftest = trace_selftest_startup_function,
+ .selftest = trace_selftest_startup_function,
#endif
};
diff --git a/kernel/trace/trace_functions_graph.c b/kernel/trace/trace_functions_graph.c
index 930c08e5b38e..66fc7b806a38 100644
--- a/kernel/trace/trace_functions_graph.c
+++ b/kernel/trace/trace_functions_graph.c
@@ -1,7 +1,7 @@
/*
*
* Function graph tracer.
- * Copyright (c) 2008 Frederic Weisbecker <fweisbec@gmail.com>
+ * Copyright (c) 2008-2009 Frederic Weisbecker <fweisbec@gmail.com>
* Mostly borrowed from function tracer which
* is Copyright (c) Steven Rostedt <srostedt@redhat.com>
*
@@ -12,6 +12,7 @@
#include <linux/fs.h>
#include "trace.h"
+#include "trace_output.h"
#define TRACE_GRAPH_INDENT 2
@@ -20,9 +21,11 @@
#define TRACE_GRAPH_PRINT_CPU 0x2
#define TRACE_GRAPH_PRINT_OVERHEAD 0x4
#define TRACE_GRAPH_PRINT_PROC 0x8
+#define TRACE_GRAPH_PRINT_DURATION 0x10
+#define TRACE_GRAPH_PRINT_ABS_TIME 0X20
static struct tracer_opt trace_opts[] = {
- /* Display overruns ? */
+ /* Display overruns? (for self-debug purpose) */
{ TRACER_OPT(funcgraph-overrun, TRACE_GRAPH_PRINT_OVERRUN) },
/* Display CPU ? */
{ TRACER_OPT(funcgraph-cpu, TRACE_GRAPH_PRINT_CPU) },
@@ -30,17 +33,22 @@ static struct tracer_opt trace_opts[] = {
{ TRACER_OPT(funcgraph-overhead, TRACE_GRAPH_PRINT_OVERHEAD) },
/* Display proc name/pid */
{ TRACER_OPT(funcgraph-proc, TRACE_GRAPH_PRINT_PROC) },
+ /* Display duration of execution */
+ { TRACER_OPT(funcgraph-duration, TRACE_GRAPH_PRINT_DURATION) },
+ /* Display absolute time of an entry */
+ { TRACER_OPT(funcgraph-abstime, TRACE_GRAPH_PRINT_ABS_TIME) },
{ } /* Empty entry */
};
static struct tracer_flags tracer_flags = {
/* Don't display overruns and proc by default */
- .val = TRACE_GRAPH_PRINT_CPU | TRACE_GRAPH_PRINT_OVERHEAD,
+ .val = TRACE_GRAPH_PRINT_CPU | TRACE_GRAPH_PRINT_OVERHEAD |
+ TRACE_GRAPH_PRINT_DURATION,
.opts = trace_opts
};
/* pid on the last trace processed */
-static pid_t last_pid[NR_CPUS] = { [0 ... NR_CPUS-1] = -1 };
+
static int graph_trace_init(struct trace_array *tr)
{
@@ -153,17 +161,25 @@ print_graph_proc(struct trace_seq *s, pid_t pid)
/* If the pid changed since the last trace, output this event */
static enum print_line_t
-verif_pid(struct trace_seq *s, pid_t pid, int cpu)
+verif_pid(struct trace_seq *s, pid_t pid, int cpu, pid_t *last_pids_cpu)
{
pid_t prev_pid;
+ pid_t *last_pid;
int ret;
- if (last_pid[cpu] != -1 && last_pid[cpu] == pid)
+ if (!last_pids_cpu)
+ return TRACE_TYPE_HANDLED;
+
+ last_pid = per_cpu_ptr(last_pids_cpu, cpu);
+
+ if (*last_pid == pid)
return TRACE_TYPE_HANDLED;
- prev_pid = last_pid[cpu];
- last_pid[cpu] = pid;
+ prev_pid = *last_pid;
+ *last_pid = pid;
+ if (prev_pid == -1)
+ return TRACE_TYPE_HANDLED;
/*
* Context-switch trace line:
@@ -231,9 +247,34 @@ trace_branch_is_leaf(struct trace_iterator *iter,
return true;
}
+/* Signal a overhead of time execution to the output */
+static int
+print_graph_overhead(unsigned long long duration, struct trace_seq *s)
+{
+ /* If duration disappear, we don't need anything */
+ if (!(tracer_flags.val & TRACE_GRAPH_PRINT_DURATION))
+ return 1;
+
+ /* Non nested entry or return */
+ if (duration == -1)
+ return trace_seq_printf(s, " ");
+
+ if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
+ /* Duration exceeded 100 msecs */
+ if (duration > 100000ULL)
+ return trace_seq_printf(s, "! ");
+
+ /* Duration exceeded 10 msecs */
+ if (duration > 10000ULL)
+ return trace_seq_printf(s, "+ ");
+ }
+
+ return trace_seq_printf(s, " ");
+}
+
static enum print_line_t
print_graph_irq(struct trace_seq *s, unsigned long addr,
- enum trace_type type, int cpu, pid_t pid)
+ enum trace_type type, int cpu, pid_t pid)
{
int ret;
@@ -241,35 +282,40 @@ print_graph_irq(struct trace_seq *s, unsigned long addr,
addr >= (unsigned long)__irqentry_text_end)
return TRACE_TYPE_UNHANDLED;
- if (type == TRACE_GRAPH_ENT) {
- ret = trace_seq_printf(s, "==========> | ");
- } else {
- /* Cpu */
- if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU) {
- ret = print_graph_cpu(s, cpu);
- if (ret == TRACE_TYPE_PARTIAL_LINE)
- return TRACE_TYPE_PARTIAL_LINE;
- }
- /* Proc */
- if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC) {
- ret = print_graph_proc(s, pid);
- if (ret == TRACE_TYPE_PARTIAL_LINE)
- return TRACE_TYPE_PARTIAL_LINE;
+ /* Cpu */
+ if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU) {
+ ret = print_graph_cpu(s, cpu);
+ if (ret == TRACE_TYPE_PARTIAL_LINE)
+ return TRACE_TYPE_PARTIAL_LINE;
+ }
+ /* Proc */
+ if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC) {
+ ret = print_graph_proc(s, pid);
+ if (ret == TRACE_TYPE_PARTIAL_LINE)
+ return TRACE_TYPE_PARTIAL_LINE;
+ ret = trace_seq_printf(s, " | ");
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+ }
- ret = trace_seq_printf(s, " | ");
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- }
+ /* No overhead */
+ ret = print_graph_overhead(-1, s);
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
- /* No overhead */
- if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
- ret = trace_seq_printf(s, " ");
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- }
+ if (type == TRACE_GRAPH_ENT)
+ ret = trace_seq_printf(s, "==========>");
+ else
+ ret = trace_seq_printf(s, "<==========");
+
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ /* Don't close the duration column if haven't one */
+ if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION)
+ trace_seq_printf(s, " |");
+ ret = trace_seq_printf(s, "\n");
- ret = trace_seq_printf(s, "<========== |\n");
- }
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
return TRACE_TYPE_HANDLED;
@@ -288,7 +334,7 @@ print_graph_duration(unsigned long long duration, struct trace_seq *s)
sprintf(msecs_str, "%lu", (unsigned long) duration);
/* Print msecs */
- ret = trace_seq_printf(s, msecs_str);
+ ret = trace_seq_printf(s, "%s", msecs_str);
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
@@ -321,19 +367,15 @@ print_graph_duration(unsigned long long duration, struct trace_seq *s)
}
-/* Signal a overhead of time execution to the output */
-static int
-print_graph_overhead(unsigned long long duration, struct trace_seq *s)
+static int print_graph_abs_time(u64 t, struct trace_seq *s)
{
- /* Duration exceeded 100 msecs */
- if (duration > 100000ULL)
- return trace_seq_printf(s, "! ");
+ unsigned long usecs_rem;
- /* Duration exceeded 10 msecs */
- if (duration > 10000ULL)
- return trace_seq_printf(s, "+ ");
+ usecs_rem = do_div(t, 1000000000);
+ usecs_rem /= 1000;
- return trace_seq_printf(s, " ");
+ return trace_seq_printf(s, "%5lu.%06lu | ",
+ (unsigned long)t, usecs_rem);
}
/* Case of a leaf function on its call entry */
@@ -356,16 +398,16 @@ print_graph_entry_leaf(struct trace_iterator *iter,
duration = graph_ret->rettime - graph_ret->calltime;
/* Overhead */
- if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
- ret = print_graph_overhead(duration, s);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- }
+ ret = print_graph_overhead(duration, s);
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
/* Duration */
- ret = print_graph_duration(duration, s);
- if (ret == TRACE_TYPE_PARTIAL_LINE)
- return TRACE_TYPE_PARTIAL_LINE;
+ if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION) {
+ ret = print_graph_duration(duration, s);
+ if (ret == TRACE_TYPE_PARTIAL_LINE)
+ return TRACE_TYPE_PARTIAL_LINE;
+ }
/* Function */
for (i = 0; i < call->depth * TRACE_GRAPH_INDENT; i++) {
@@ -394,25 +436,17 @@ print_graph_entry_nested(struct ftrace_graph_ent_entry *entry,
struct ftrace_graph_ent *call = &entry->graph_ent;
/* No overhead */
- if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
- ret = trace_seq_printf(s, " ");
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- }
+ ret = print_graph_overhead(-1, s);
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
- /* Interrupt */
- ret = print_graph_irq(s, call->func, TRACE_GRAPH_ENT, cpu, pid);
- if (ret == TRACE_TYPE_UNHANDLED) {
- /* No time */
+ /* No time */
+ if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION) {
ret = trace_seq_printf(s, " | ");
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
- } else {
- if (ret == TRACE_TYPE_PARTIAL_LINE)
- return TRACE_TYPE_PARTIAL_LINE;
}
-
/* Function */
for (i = 0; i < call->depth * TRACE_GRAPH_INDENT; i++) {
ret = trace_seq_printf(s, " ");
@@ -433,15 +467,30 @@ print_graph_entry_nested(struct ftrace_graph_ent_entry *entry,
static enum print_line_t
print_graph_entry(struct ftrace_graph_ent_entry *field, struct trace_seq *s,
- struct trace_iterator *iter, int cpu)
+ struct trace_iterator *iter)
{
int ret;
+ int cpu = iter->cpu;
+ pid_t *last_entry = iter->private;
struct trace_entry *ent = iter->ent;
+ struct ftrace_graph_ent *call = &field->graph_ent;
/* Pid */
- if (verif_pid(s, ent->pid, cpu) == TRACE_TYPE_PARTIAL_LINE)
+ if (verif_pid(s, ent->pid, cpu, last_entry) == TRACE_TYPE_PARTIAL_LINE)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ /* Interrupt */
+ ret = print_graph_irq(s, call->func, TRACE_GRAPH_ENT, cpu, ent->pid);
+ if (ret == TRACE_TYPE_PARTIAL_LINE)
return TRACE_TYPE_PARTIAL_LINE;
+ /* Absolute time */
+ if (tracer_flags.val & TRACE_GRAPH_PRINT_ABS_TIME) {
+ ret = print_graph_abs_time(iter->ts, s);
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+ }
+
/* Cpu */
if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU) {
ret = print_graph_cpu(s, cpu);
@@ -469,16 +518,25 @@ print_graph_entry(struct ftrace_graph_ent_entry *field, struct trace_seq *s,
static enum print_line_t
print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s,
- struct trace_entry *ent, int cpu)
+ struct trace_entry *ent, struct trace_iterator *iter)
{
int i;
int ret;
+ int cpu = iter->cpu;
+ pid_t *last_pid = iter->private;
unsigned long long duration = trace->rettime - trace->calltime;
/* Pid */
- if (verif_pid(s, ent->pid, cpu) == TRACE_TYPE_PARTIAL_LINE)
+ if (verif_pid(s, ent->pid, cpu, last_pid) == TRACE_TYPE_PARTIAL_LINE)
return TRACE_TYPE_PARTIAL_LINE;
+ /* Absolute time */
+ if (tracer_flags.val & TRACE_GRAPH_PRINT_ABS_TIME) {
+ ret = print_graph_abs_time(iter->ts, s);
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+ }
+
/* Cpu */
if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU) {
ret = print_graph_cpu(s, cpu);
@@ -498,16 +556,16 @@ print_graph_return(struct ftrace_graph_ret *trace, struct trace_seq *s,
}
/* Overhead */
- if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
- ret = print_graph_overhead(duration, s);
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
- }
+ ret = print_graph_overhead(duration, s);
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
/* Duration */
- ret = print_graph_duration(duration, s);
- if (ret == TRACE_TYPE_PARTIAL_LINE)
- return TRACE_TYPE_PARTIAL_LINE;
+ if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION) {
+ ret = print_graph_duration(duration, s);
+ if (ret == TRACE_TYPE_PARTIAL_LINE)
+ return TRACE_TYPE_PARTIAL_LINE;
+ }
/* Closing brace */
for (i = 0; i < trace->depth * TRACE_GRAPH_INDENT; i++) {
@@ -541,14 +599,23 @@ print_graph_comment(struct print_entry *trace, struct trace_seq *s,
{
int i;
int ret;
+ int cpu = iter->cpu;
+ pid_t *last_pid = iter->private;
+
+ /* Absolute time */
+ if (tracer_flags.val & TRACE_GRAPH_PRINT_ABS_TIME) {
+ ret = print_graph_abs_time(iter->ts, s);
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+ }
/* Pid */
- if (verif_pid(s, ent->pid, iter->cpu) == TRACE_TYPE_PARTIAL_LINE)
+ if (verif_pid(s, ent->pid, cpu, last_pid) == TRACE_TYPE_PARTIAL_LINE)
return TRACE_TYPE_PARTIAL_LINE;
/* Cpu */
if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU) {
- ret = print_graph_cpu(s, iter->cpu);
+ ret = print_graph_cpu(s, cpu);
if (ret == TRACE_TYPE_PARTIAL_LINE)
return TRACE_TYPE_PARTIAL_LINE;
}
@@ -565,17 +632,17 @@ print_graph_comment(struct print_entry *trace, struct trace_seq *s,
}
/* No overhead */
- if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
- ret = trace_seq_printf(s, " ");
+ ret = print_graph_overhead(-1, s);
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ /* No time */
+ if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION) {
+ ret = trace_seq_printf(s, " | ");
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
}
- /* No time */
- ret = trace_seq_printf(s, " | ");
- if (!ret)
- return TRACE_TYPE_PARTIAL_LINE;
-
/* Indentation */
if (trace->depth > 0)
for (i = 0; i < (trace->depth + 1) * TRACE_GRAPH_INDENT; i++) {
@@ -589,8 +656,11 @@ print_graph_comment(struct print_entry *trace, struct trace_seq *s,
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
- if (ent->flags & TRACE_FLAG_CONT)
- trace_seq_print_cont(s, iter);
+ /* Strip ending newline */
+ if (s->buffer[s->len - 1] == '\n') {
+ s->buffer[s->len - 1] = '\0';
+ s->len--;
+ }
ret = trace_seq_printf(s, " */\n");
if (!ret)
@@ -610,13 +680,12 @@ print_graph_function(struct trace_iterator *iter)
case TRACE_GRAPH_ENT: {
struct ftrace_graph_ent_entry *field;
trace_assign_type(field, entry);
- return print_graph_entry(field, s, iter,
- iter->cpu);
+ return print_graph_entry(field, s, iter);
}
case TRACE_GRAPH_RET: {
struct ftrace_graph_ret_entry *field;
trace_assign_type(field, entry);
- return print_graph_return(&field->ret, s, entry, iter->cpu);
+ return print_graph_return(&field->ret, s, entry, iter);
}
case TRACE_PRINT: {
struct print_entry *field;
@@ -632,28 +701,55 @@ static void print_graph_headers(struct seq_file *s)
{
/* 1st line */
seq_printf(s, "# ");
+ if (tracer_flags.val & TRACE_GRAPH_PRINT_ABS_TIME)
+ seq_printf(s, " TIME ");
if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU)
- seq_printf(s, "CPU ");
+ seq_printf(s, "CPU");
if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC)
- seq_printf(s, "TASK/PID ");
- if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD)
- seq_printf(s, "OVERHEAD/");
- seq_printf(s, "DURATION FUNCTION CALLS\n");
+ seq_printf(s, " TASK/PID ");
+ if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION)
+ seq_printf(s, " DURATION ");
+ seq_printf(s, " FUNCTION CALLS\n");
/* 2nd line */
seq_printf(s, "# ");
+ if (tracer_flags.val & TRACE_GRAPH_PRINT_ABS_TIME)
+ seq_printf(s, " | ");
if (tracer_flags.val & TRACE_GRAPH_PRINT_CPU)
- seq_printf(s, "| ");
+ seq_printf(s, "| ");
if (tracer_flags.val & TRACE_GRAPH_PRINT_PROC)
- seq_printf(s, "| | ");
- if (tracer_flags.val & TRACE_GRAPH_PRINT_OVERHEAD) {
- seq_printf(s, "| ");
- seq_printf(s, "| | | | |\n");
- } else
- seq_printf(s, " | | | | |\n");
+ seq_printf(s, " | | ");
+ if (tracer_flags.val & TRACE_GRAPH_PRINT_DURATION)
+ seq_printf(s, " | | ");
+ seq_printf(s, " | | | |\n");
+}
+
+static void graph_trace_open(struct trace_iterator *iter)
+{
+ /* pid on the last trace processed */
+ pid_t *last_pid = alloc_percpu(pid_t);
+ int cpu;
+
+ if (!last_pid)
+ pr_warning("function graph tracer: not enough memory\n");
+ else
+ for_each_possible_cpu(cpu) {
+ pid_t *pid = per_cpu_ptr(last_pid, cpu);
+ *pid = -1;
+ }
+
+ iter->private = last_pid;
}
+
+static void graph_trace_close(struct trace_iterator *iter)
+{
+ percpu_free(iter->private);
+}
+
static struct tracer graph_trace __read_mostly = {
.name = "function_graph",
+ .open = graph_trace_open,
+ .close = graph_trace_close,
.init = graph_trace_init,
.reset = graph_trace_reset,
.print_line = print_graph_function,
diff --git a/kernel/trace/trace_hw_branches.c b/kernel/trace/trace_hw_branches.c
index 649df22d435f..fff3545fc866 100644
--- a/kernel/trace/trace_hw_branches.c
+++ b/kernel/trace/trace_hw_branches.c
@@ -1,7 +1,8 @@
/*
* h/w branch tracer for x86 based on bts
*
- * Copyright (C) 2008 Markus Metzger <markus.t.metzger@gmail.com>
+ * Copyright (C) 2008-2009 Intel Corporation.
+ * Markus Metzger <markus.t.metzger@gmail.com>, 2008-2009
*
*/
@@ -10,21 +11,44 @@
#include <linux/debugfs.h>
#include <linux/ftrace.h>
#include <linux/kallsyms.h>
+#include <linux/mutex.h>
+#include <linux/cpu.h>
+#include <linux/smp.h>
#include <asm/ds.h>
#include "trace.h"
+#include "trace_output.h"
#define SIZEOF_BTS (1 << 13)
+/* The tracer mutex protects the below per-cpu tracer array.
+ It needs to be held to:
+ - start tracing on all cpus
+ - stop tracing on all cpus
+ - start tracing on a single hotplug cpu
+ - stop tracing on a single hotplug cpu
+ - read the trace from all cpus
+ - read the trace from a single cpu
+*/
+static DEFINE_MUTEX(bts_tracer_mutex);
static DEFINE_PER_CPU(struct bts_tracer *, tracer);
static DEFINE_PER_CPU(unsigned char[SIZEOF_BTS], buffer);
#define this_tracer per_cpu(tracer, smp_processor_id())
#define this_buffer per_cpu(buffer, smp_processor_id())
+static int __read_mostly trace_hw_branches_enabled;
+static struct trace_array *hw_branch_trace __read_mostly;
+
+/*
+ * Start tracing on the current cpu.
+ * The argument is ignored.
+ *
+ * pre: bts_tracer_mutex must be locked.
+ */
static void bts_trace_start_cpu(void *arg)
{
if (this_tracer)
@@ -42,14 +66,20 @@ static void bts_trace_start_cpu(void *arg)
static void bts_trace_start(struct trace_array *tr)
{
- int cpu;
+ mutex_lock(&bts_tracer_mutex);
- tracing_reset_online_cpus(tr);
+ on_each_cpu(bts_trace_start_cpu, NULL, 1);
+ trace_hw_branches_enabled = 1;
- for_each_cpu(cpu, cpu_possible_mask)
- smp_call_function_single(cpu, bts_trace_start_cpu, NULL, 1);
+ mutex_unlock(&bts_tracer_mutex);
}
+/*
+ * Start tracing on the current cpu.
+ * The argument is ignored.
+ *
+ * pre: bts_tracer_mutex must be locked.
+ */
static void bts_trace_stop_cpu(void *arg)
{
if (this_tracer) {
@@ -60,26 +90,63 @@ static void bts_trace_stop_cpu(void *arg)
static void bts_trace_stop(struct trace_array *tr)
{
- int cpu;
+ mutex_lock(&bts_tracer_mutex);
+
+ trace_hw_branches_enabled = 0;
+ on_each_cpu(bts_trace_stop_cpu, NULL, 1);
- for_each_cpu(cpu, cpu_possible_mask)
+ mutex_unlock(&bts_tracer_mutex);
+}
+
+static int __cpuinit bts_hotcpu_handler(struct notifier_block *nfb,
+ unsigned long action, void *hcpu)
+{
+ unsigned int cpu = (unsigned long)hcpu;
+
+ mutex_lock(&bts_tracer_mutex);
+
+ if (!trace_hw_branches_enabled)
+ goto out;
+
+ switch (action) {
+ case CPU_ONLINE:
+ case CPU_DOWN_FAILED:
+ smp_call_function_single(cpu, bts_trace_start_cpu, NULL, 1);
+ break;
+ case CPU_DOWN_PREPARE:
smp_call_function_single(cpu, bts_trace_stop_cpu, NULL, 1);
+ break;
+ }
+
+ out:
+ mutex_unlock(&bts_tracer_mutex);
+ return NOTIFY_DONE;
}
+static struct notifier_block bts_hotcpu_notifier __cpuinitdata = {
+ .notifier_call = bts_hotcpu_handler
+};
+
static int bts_trace_init(struct trace_array *tr)
{
+ hw_branch_trace = tr;
+
+ register_hotcpu_notifier(&bts_hotcpu_notifier);
tracing_reset_online_cpus(tr);
bts_trace_start(tr);
return 0;
}
+static void bts_trace_reset(struct trace_array *tr)
+{
+ bts_trace_stop(tr);
+ unregister_hotcpu_notifier(&bts_hotcpu_notifier);
+}
+
static void bts_trace_print_header(struct seq_file *m)
{
- seq_puts(m,
- "# CPU# FROM TO FUNCTION\n");
- seq_puts(m,
- "# | | | |\n");
+ seq_puts(m, "# CPU# TO <- FROM\n");
}
static enum print_line_t bts_trace_print_line(struct trace_iterator *iter)
@@ -87,15 +154,15 @@ static enum print_line_t bts_trace_print_line(struct trace_iterator *iter)
struct trace_entry *entry = iter->ent;
struct trace_seq *seq = &iter->seq;
struct hw_branch_entry *it;
+ unsigned long symflags = TRACE_ITER_SYM_OFFSET;
trace_assign_type(it, entry);
if (entry->type == TRACE_HW_BRANCHES) {
if (trace_seq_printf(seq, "%4d ", entry->cpu) &&
- trace_seq_printf(seq, "0x%016llx -> 0x%016llx ",
- it->from, it->to) &&
- (!it->from ||
- seq_print_ip_sym(seq, it->from, /* sym_flags = */ 0)) &&
+ seq_print_ip_sym(seq, it->to, symflags) &&
+ trace_seq_printf(seq, "\t <- ") &&
+ seq_print_ip_sym(seq, it->from, symflags) &&
trace_seq_printf(seq, "\n"))
return TRACE_TYPE_HANDLED;
return TRACE_TYPE_PARTIAL_LINE;;
@@ -103,26 +170,42 @@ static enum print_line_t bts_trace_print_line(struct trace_iterator *iter)
return TRACE_TYPE_UNHANDLED;
}
-void trace_hw_branch(struct trace_array *tr, u64 from, u64 to)
+void trace_hw_branch(u64 from, u64 to)
{
+ struct trace_array *tr = hw_branch_trace;
struct ring_buffer_event *event;
struct hw_branch_entry *entry;
- unsigned long irq;
+ unsigned long irq1, irq2;
+ int cpu;
- event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), &irq);
- if (!event)
+ if (unlikely(!tr))
return;
+
+ if (unlikely(!trace_hw_branches_enabled))
+ return;
+
+ local_irq_save(irq1);
+ cpu = raw_smp_processor_id();
+ if (atomic_inc_return(&tr->data[cpu]->disabled) != 1)
+ goto out;
+
+ event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry), &irq2);
+ if (!event)
+ goto out;
entry = ring_buffer_event_data(event);
tracing_generic_entry_update(&entry->ent, 0, from);
entry->ent.type = TRACE_HW_BRANCHES;
- entry->ent.cpu = smp_processor_id();
+ entry->ent.cpu = cpu;
entry->from = from;
entry->to = to;
- ring_buffer_unlock_commit(tr->buffer, event, irq);
+ ring_buffer_unlock_commit(tr->buffer, event, irq2);
+
+ out:
+ atomic_dec(&tr->data[cpu]->disabled);
+ local_irq_restore(irq1);
}
-static void trace_bts_at(struct trace_array *tr,
- const struct bts_trace *trace, void *at)
+static void trace_bts_at(const struct bts_trace *trace, void *at)
{
struct bts_struct bts;
int err = 0;
@@ -137,18 +220,29 @@ static void trace_bts_at(struct trace_array *tr,
switch (bts.qualifier) {
case BTS_BRANCH:
- trace_hw_branch(tr, bts.variant.lbr.from, bts.variant.lbr.to);
+ trace_hw_branch(bts.variant.lbr.from, bts.variant.lbr.to);
break;
}
}
+/*
+ * Collect the trace on the current cpu and write it into the ftrace buffer.
+ *
+ * pre: bts_tracer_mutex must be locked
+ */
static void trace_bts_cpu(void *arg)
{
struct trace_array *tr = (struct trace_array *) arg;
const struct bts_trace *trace;
unsigned char *at;
- if (!this_tracer)
+ if (unlikely(!tr))
+ return;
+
+ if (unlikely(atomic_read(&tr->data[raw_smp_processor_id()]->disabled)))
+ return;
+
+ if (unlikely(!this_tracer))
return;
ds_suspend_bts(this_tracer);
@@ -158,11 +252,11 @@ static void trace_bts_cpu(void *arg)
for (at = trace->ds.top; (void *)at < trace->ds.end;
at += trace->ds.size)
- trace_bts_at(tr, trace, at);
+ trace_bts_at(trace, at);
for (at = trace->ds.begin; (void *)at < trace->ds.top;
at += trace->ds.size)
- trace_bts_at(tr, trace, at);
+ trace_bts_at(trace, at);
out:
ds_resume_bts(this_tracer);
@@ -170,22 +264,38 @@ out:
static void trace_bts_prepare(struct trace_iterator *iter)
{
- int cpu;
+ mutex_lock(&bts_tracer_mutex);
+
+ on_each_cpu(trace_bts_cpu, iter->tr, 1);
+
+ mutex_unlock(&bts_tracer_mutex);
+}
+
+static void trace_bts_close(struct trace_iterator *iter)
+{
+ tracing_reset_online_cpus(iter->tr);
+}
+
+void trace_hw_branch_oops(void)
+{
+ mutex_lock(&bts_tracer_mutex);
+
+ trace_bts_cpu(hw_branch_trace);
- for_each_cpu(cpu, cpu_possible_mask)
- smp_call_function_single(cpu, trace_bts_cpu, iter->tr, 1);
+ mutex_unlock(&bts_tracer_mutex);
}
struct tracer bts_tracer __read_mostly =
{
.name = "hw-branch-tracer",
.init = bts_trace_init,
- .reset = bts_trace_stop,
+ .reset = bts_trace_reset,
.print_header = bts_trace_print_header,
.print_line = bts_trace_print_line,
.start = bts_trace_start,
.stop = bts_trace_stop,
- .open = trace_bts_prepare
+ .open = trace_bts_prepare,
+ .close = trace_bts_close
};
__init static int init_bts_trace(void)
diff --git a/kernel/trace/trace_irqsoff.c b/kernel/trace/trace_irqsoff.c
index 62a78d943534..ed344b022a14 100644
--- a/kernel/trace/trace_irqsoff.c
+++ b/kernel/trace/trace_irqsoff.c
@@ -353,28 +353,18 @@ void trace_preempt_off(unsigned long a0, unsigned long a1)
}
#endif /* CONFIG_PREEMPT_TRACER */
-/*
- * save_tracer_enabled is used to save the state of the tracer_enabled
- * variable when we disable it when we open a trace output file.
- */
-static int save_tracer_enabled;
-
static void start_irqsoff_tracer(struct trace_array *tr)
{
register_ftrace_function(&trace_ops);
- if (tracing_is_enabled()) {
+ if (tracing_is_enabled())
tracer_enabled = 1;
- save_tracer_enabled = 1;
- } else {
+ else
tracer_enabled = 0;
- save_tracer_enabled = 0;
- }
}
static void stop_irqsoff_tracer(struct trace_array *tr)
{
tracer_enabled = 0;
- save_tracer_enabled = 0;
unregister_ftrace_function(&trace_ops);
}
@@ -395,25 +385,11 @@ static void irqsoff_tracer_reset(struct trace_array *tr)
static void irqsoff_tracer_start(struct trace_array *tr)
{
tracer_enabled = 1;
- save_tracer_enabled = 1;
}
static void irqsoff_tracer_stop(struct trace_array *tr)
{
tracer_enabled = 0;
- save_tracer_enabled = 0;
-}
-
-static void irqsoff_tracer_open(struct trace_iterator *iter)
-{
- /* stop the trace while dumping */
- tracer_enabled = 0;
-}
-
-static void irqsoff_tracer_close(struct trace_iterator *iter)
-{
- /* restart tracing */
- tracer_enabled = save_tracer_enabled;
}
#ifdef CONFIG_IRQSOFF_TRACER
@@ -431,8 +407,6 @@ static struct tracer irqsoff_tracer __read_mostly =
.reset = irqsoff_tracer_reset,
.start = irqsoff_tracer_start,
.stop = irqsoff_tracer_stop,
- .open = irqsoff_tracer_open,
- .close = irqsoff_tracer_close,
.print_max = 1,
#ifdef CONFIG_FTRACE_SELFTEST
.selftest = trace_selftest_startup_irqsoff,
@@ -459,8 +433,6 @@ static struct tracer preemptoff_tracer __read_mostly =
.reset = irqsoff_tracer_reset,
.start = irqsoff_tracer_start,
.stop = irqsoff_tracer_stop,
- .open = irqsoff_tracer_open,
- .close = irqsoff_tracer_close,
.print_max = 1,
#ifdef CONFIG_FTRACE_SELFTEST
.selftest = trace_selftest_startup_preemptoff,
@@ -489,8 +461,6 @@ static struct tracer preemptirqsoff_tracer __read_mostly =
.reset = irqsoff_tracer_reset,
.start = irqsoff_tracer_start,
.stop = irqsoff_tracer_stop,
- .open = irqsoff_tracer_open,
- .close = irqsoff_tracer_close,
.print_max = 1,
#ifdef CONFIG_FTRACE_SELFTEST
.selftest = trace_selftest_startup_preemptirqsoff,
diff --git a/kernel/trace/trace_mmiotrace.c b/kernel/trace/trace_mmiotrace.c
index fffcb069f1dc..ec78e244242e 100644
--- a/kernel/trace/trace_mmiotrace.c
+++ b/kernel/trace/trace_mmiotrace.c
@@ -9,8 +9,10 @@
#include <linux/kernel.h>
#include <linux/mmiotrace.h>
#include <linux/pci.h>
+#include <asm/atomic.h>
#include "trace.h"
+#include "trace_output.h"
struct header_iter {
struct pci_dev *dev;
@@ -19,6 +21,7 @@ struct header_iter {
static struct trace_array *mmio_trace_array;
static bool overrun_detected;
static unsigned long prev_overruns;
+static atomic_t dropped_count;
static void mmio_reset_data(struct trace_array *tr)
{
@@ -121,11 +124,11 @@ static void mmio_close(struct trace_iterator *iter)
static unsigned long count_overruns(struct trace_iterator *iter)
{
- unsigned long cnt = 0;
+ unsigned long cnt = atomic_xchg(&dropped_count, 0);
unsigned long over = ring_buffer_overruns(iter->tr->buffer);
if (over > prev_overruns)
- cnt = over - prev_overruns;
+ cnt += over - prev_overruns;
prev_overruns = over;
return cnt;
}
@@ -181,21 +184,22 @@ static enum print_line_t mmio_print_rw(struct trace_iterator *iter)
switch (rw->opcode) {
case MMIO_READ:
ret = trace_seq_printf(s,
- "R %d %lu.%06lu %d 0x%llx 0x%lx 0x%lx %d\n",
+ "R %d %u.%06lu %d 0x%llx 0x%lx 0x%lx %d\n",
rw->width, secs, usec_rem, rw->map_id,
(unsigned long long)rw->phys,
rw->value, rw->pc, 0);
break;
case MMIO_WRITE:
ret = trace_seq_printf(s,
- "W %d %lu.%06lu %d 0x%llx 0x%lx 0x%lx %d\n",
+ "W %d %u.%06lu %d 0x%llx 0x%lx 0x%lx %d\n",
rw->width, secs, usec_rem, rw->map_id,
(unsigned long long)rw->phys,
rw->value, rw->pc, 0);
break;
case MMIO_UNKNOWN_OP:
ret = trace_seq_printf(s,
- "UNKNOWN %lu.%06lu %d 0x%llx %02x,%02x,%02x 0x%lx %d\n",
+ "UNKNOWN %u.%06lu %d 0x%llx %02lx,%02lx,"
+ "%02lx 0x%lx %d\n",
secs, usec_rem, rw->map_id,
(unsigned long long)rw->phys,
(rw->value >> 16) & 0xff, (rw->value >> 8) & 0xff,
@@ -227,14 +231,14 @@ static enum print_line_t mmio_print_map(struct trace_iterator *iter)
switch (m->opcode) {
case MMIO_PROBE:
ret = trace_seq_printf(s,
- "MAP %lu.%06lu %d 0x%llx 0x%lx 0x%lx 0x%lx %d\n",
+ "MAP %u.%06lu %d 0x%llx 0x%lx 0x%lx 0x%lx %d\n",
secs, usec_rem, m->map_id,
(unsigned long long)m->phys, m->virt, m->len,
0UL, 0);
break;
case MMIO_UNPROBE:
ret = trace_seq_printf(s,
- "UNMAP %lu.%06lu %d 0x%lx %d\n",
+ "UNMAP %u.%06lu %d 0x%lx %d\n",
secs, usec_rem, m->map_id, 0UL, 0);
break;
default:
@@ -258,13 +262,10 @@ static enum print_line_t mmio_print_mark(struct trace_iterator *iter)
int ret;
/* The trailing newline must be in the message. */
- ret = trace_seq_printf(s, "MARK %lu.%06lu %s", secs, usec_rem, msg);
+ ret = trace_seq_printf(s, "MARK %u.%06lu %s", secs, usec_rem, msg);
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
- if (entry->flags & TRACE_FLAG_CONT)
- trace_seq_print_cont(s, iter);
-
return TRACE_TYPE_HANDLED;
}
@@ -310,8 +311,10 @@ static void __trace_mmiotrace_rw(struct trace_array *tr,
event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
&irq_flags);
- if (!event)
+ if (!event) {
+ atomic_inc(&dropped_count);
return;
+ }
entry = ring_buffer_event_data(event);
tracing_generic_entry_update(&entry->ent, 0, preempt_count());
entry->ent.type = TRACE_MMIO_RW;
@@ -338,8 +341,10 @@ static void __trace_mmiotrace_map(struct trace_array *tr,
event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry),
&irq_flags);
- if (!event)
+ if (!event) {
+ atomic_inc(&dropped_count);
return;
+ }
entry = ring_buffer_event_data(event);
tracing_generic_entry_update(&entry->ent, 0, preempt_count());
entry->ent.type = TRACE_MMIO_MAP;
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c
new file mode 100644
index 000000000000..1a4e144a9f8f
--- /dev/null
+++ b/kernel/trace/trace_output.c
@@ -0,0 +1,829 @@
+/*
+ * trace_output.c
+ *
+ * Copyright (C) 2008 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/ftrace.h>
+
+#include "trace_output.h"
+
+/* must be a power of 2 */
+#define EVENT_HASHSIZE 128
+
+static DEFINE_MUTEX(trace_event_mutex);
+static struct hlist_head event_hash[EVENT_HASHSIZE] __read_mostly;
+
+static int next_event_type = __TRACE_LAST_TYPE + 1;
+
+/**
+ * trace_seq_printf - sequence printing of trace information
+ * @s: trace sequence descriptor
+ * @fmt: printf format string
+ *
+ * The tracer may use either sequence operations or its own
+ * copy to user routines. To simplify formating of a trace
+ * trace_seq_printf is used to store strings into a special
+ * buffer (@s). Then the output may be either used by
+ * the sequencer or pulled into another buffer.
+ */
+int
+trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
+{
+ int len = (PAGE_SIZE - 1) - s->len;
+ va_list ap;
+ int ret;
+
+ if (!len)
+ return 0;
+
+ va_start(ap, fmt);
+ ret = vsnprintf(s->buffer + s->len, len, fmt, ap);
+ va_end(ap);
+
+ /* If we can't write it all, don't bother writing anything */
+ if (ret >= len)
+ return 0;
+
+ s->len += ret;
+
+ return len;
+}
+
+/**
+ * trace_seq_puts - trace sequence printing of simple string
+ * @s: trace sequence descriptor
+ * @str: simple string to record
+ *
+ * The tracer may use either the sequence operations or its own
+ * copy to user routines. This function records a simple string
+ * into a special buffer (@s) for later retrieval by a sequencer
+ * or other mechanism.
+ */
+int trace_seq_puts(struct trace_seq *s, const char *str)
+{
+ int len = strlen(str);
+
+ if (len > ((PAGE_SIZE - 1) - s->len))
+ return 0;
+
+ memcpy(s->buffer + s->len, str, len);
+ s->len += len;
+
+ return len;
+}
+
+int trace_seq_putc(struct trace_seq *s, unsigned char c)
+{
+ if (s->len >= (PAGE_SIZE - 1))
+ return 0;
+
+ s->buffer[s->len++] = c;
+
+ return 1;
+}
+
+int trace_seq_putmem(struct trace_seq *s, void *mem, size_t len)
+{
+ if (len > ((PAGE_SIZE - 1) - s->len))
+ return 0;
+
+ memcpy(s->buffer + s->len, mem, len);
+ s->len += len;
+
+ return len;
+}
+
+int trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len)
+{
+ unsigned char hex[HEX_CHARS];
+ unsigned char *data = mem;
+ int i, j;
+
+#ifdef __BIG_ENDIAN
+ for (i = 0, j = 0; i < len; i++) {
+#else
+ for (i = len-1, j = 0; i >= 0; i--) {
+#endif
+ hex[j++] = hex_asc_hi(data[i]);
+ hex[j++] = hex_asc_lo(data[i]);
+ }
+ hex[j++] = ' ';
+
+ return trace_seq_putmem(s, hex, j);
+}
+
+int trace_seq_path(struct trace_seq *s, struct path *path)
+{
+ unsigned char *p;
+
+ if (s->len >= (PAGE_SIZE - 1))
+ return 0;
+ p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
+ if (!IS_ERR(p)) {
+ p = mangle_path(s->buffer + s->len, p, "\n");
+ if (p) {
+ s->len = p - s->buffer;
+ return 1;
+ }
+ } else {
+ s->buffer[s->len++] = '?';
+ return 1;
+ }
+
+ return 0;
+}
+
+#ifdef CONFIG_KRETPROBES
+static inline const char *kretprobed(const char *name)
+{
+ static const char tramp_name[] = "kretprobe_trampoline";
+ int size = sizeof(tramp_name);
+
+ if (strncmp(tramp_name, name, size) == 0)
+ return "[unknown/kretprobe'd]";
+ return name;
+}
+#else
+static inline const char *kretprobed(const char *name)
+{
+ return name;
+}
+#endif /* CONFIG_KRETPROBES */
+
+static int
+seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address)
+{
+#ifdef CONFIG_KALLSYMS
+ char str[KSYM_SYMBOL_LEN];
+ const char *name;
+
+ kallsyms_lookup(address, NULL, NULL, NULL, str);
+
+ name = kretprobed(str);
+
+ return trace_seq_printf(s, fmt, name);
+#endif
+ return 1;
+}
+
+static int
+seq_print_sym_offset(struct trace_seq *s, const char *fmt,
+ unsigned long address)
+{
+#ifdef CONFIG_KALLSYMS
+ char str[KSYM_SYMBOL_LEN];
+ const char *name;
+
+ sprint_symbol(str, address);
+ name = kretprobed(str);
+
+ return trace_seq_printf(s, fmt, name);
+#endif
+ return 1;
+}
+
+#ifndef CONFIG_64BIT
+# define IP_FMT "%08lx"
+#else
+# define IP_FMT "%016lx"
+#endif
+
+int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
+ unsigned long ip, unsigned long sym_flags)
+{
+ struct file *file = NULL;
+ unsigned long vmstart = 0;
+ int ret = 1;
+
+ if (mm) {
+ const struct vm_area_struct *vma;
+
+ down_read(&mm->mmap_sem);
+ vma = find_vma(mm, ip);
+ if (vma) {
+ file = vma->vm_file;
+ vmstart = vma->vm_start;
+ }
+ if (file) {
+ ret = trace_seq_path(s, &file->f_path);
+ if (ret)
+ ret = trace_seq_printf(s, "[+0x%lx]",
+ ip - vmstart);
+ }
+ up_read(&mm->mmap_sem);
+ }
+ if (ret && ((sym_flags & TRACE_ITER_SYM_ADDR) || !file))
+ ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
+ return ret;
+}
+
+int
+seq_print_userip_objs(const struct userstack_entry *entry, struct trace_seq *s,
+ unsigned long sym_flags)
+{
+ struct mm_struct *mm = NULL;
+ int ret = 1;
+ unsigned int i;
+
+ if (trace_flags & TRACE_ITER_SYM_USEROBJ) {
+ struct task_struct *task;
+ /*
+ * we do the lookup on the thread group leader,
+ * since individual threads might have already quit!
+ */
+ rcu_read_lock();
+ task = find_task_by_vpid(entry->ent.tgid);
+ if (task)
+ mm = get_task_mm(task);
+ rcu_read_unlock();
+ }
+
+ for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
+ unsigned long ip = entry->caller[i];
+
+ if (ip == ULONG_MAX || !ret)
+ break;
+ if (i && ret)
+ ret = trace_seq_puts(s, " <- ");
+ if (!ip) {
+ if (ret)
+ ret = trace_seq_puts(s, "??");
+ continue;
+ }
+ if (!ret)
+ break;
+ if (ret)
+ ret = seq_print_user_ip(s, mm, ip, sym_flags);
+ }
+
+ if (mm)
+ mmput(mm);
+ return ret;
+}
+
+int
+seq_print_ip_sym(struct trace_seq *s, unsigned long ip, unsigned long sym_flags)
+{
+ int ret;
+
+ if (!ip)
+ return trace_seq_printf(s, "0");
+
+ if (sym_flags & TRACE_ITER_SYM_OFFSET)
+ ret = seq_print_sym_offset(s, "%s", ip);
+ else
+ ret = seq_print_sym_short(s, "%s", ip);
+
+ if (!ret)
+ return 0;
+
+ if (sym_flags & TRACE_ITER_SYM_ADDR)
+ ret = trace_seq_printf(s, " <" IP_FMT ">", ip);
+ return ret;
+}
+
+static const char state_to_char[] = TASK_STATE_TO_CHAR_STR;
+
+static int task_state_char(unsigned long state)
+{
+ int bit = state ? __ffs(state) + 1 : 0;
+
+ return bit < sizeof(state_to_char) - 1 ? state_to_char[bit] : '?';
+}
+
+/**
+ * ftrace_find_event - find a registered event
+ * @type: the type of event to look for
+ *
+ * Returns an event of type @type otherwise NULL
+ */
+struct trace_event *ftrace_find_event(int type)
+{
+ struct trace_event *event;
+ struct hlist_node *n;
+ unsigned key;
+
+ key = type & (EVENT_HASHSIZE - 1);
+
+ hlist_for_each_entry_rcu(event, n, &event_hash[key], node) {
+ if (event->type == type)
+ return event;
+ }
+
+ return NULL;
+}
+
+/**
+ * register_ftrace_event - register output for an event type
+ * @event: the event type to register
+ *
+ * Event types are stored in a hash and this hash is used to
+ * find a way to print an event. If the @event->type is set
+ * then it will use that type, otherwise it will assign a
+ * type to use.
+ *
+ * If you assign your own type, please make sure it is added
+ * to the trace_type enum in trace.h, to avoid collisions
+ * with the dynamic types.
+ *
+ * Returns the event type number or zero on error.
+ */
+int register_ftrace_event(struct trace_event *event)
+{
+ unsigned key;
+ int ret = 0;
+
+ mutex_lock(&trace_event_mutex);
+
+ if (!event->type)
+ event->type = next_event_type++;
+ else if (event->type > __TRACE_LAST_TYPE) {
+ printk(KERN_WARNING "Need to add type to trace.h\n");
+ WARN_ON(1);
+ }
+
+ if (ftrace_find_event(event->type))
+ goto out;
+
+ key = event->type & (EVENT_HASHSIZE - 1);
+
+ hlist_add_head_rcu(&event->node, &event_hash[key]);
+
+ ret = event->type;
+ out:
+ mutex_unlock(&trace_event_mutex);
+
+ return ret;
+}
+
+/**
+ * unregister_ftrace_event - remove a no longer used event
+ * @event: the event to remove
+ */
+int unregister_ftrace_event(struct trace_event *event)
+{
+ mutex_lock(&trace_event_mutex);
+ hlist_del(&event->node);
+ mutex_unlock(&trace_event_mutex);
+
+ return 0;
+}
+
+/*
+ * Standard events
+ */
+
+int
+trace_nop_print(struct trace_seq *s, struct trace_entry *entry, int flags)
+{
+ return 0;
+}
+
+/* TRACE_FN */
+static int
+trace_fn_latency(struct trace_seq *s, struct trace_entry *entry, int flags)
+{
+ struct ftrace_entry *field;
+
+ trace_assign_type(field, entry);
+
+ if (!seq_print_ip_sym(s, field->ip, flags))
+ goto partial;
+ if (!trace_seq_puts(s, " ("))
+ goto partial;
+ if (!seq_print_ip_sym(s, field->parent_ip, flags))
+ goto partial;
+ if (!trace_seq_puts(s, ")\n"))
+ goto partial;
+
+ return 0;
+
+ partial:
+ return TRACE_TYPE_PARTIAL_LINE;
+}
+
+static int
+trace_fn_trace(struct trace_seq *s, struct trace_entry *entry, int flags)
+{
+ struct ftrace_entry *field;
+
+ trace_assign_type(field, entry);
+
+ if (!seq_print_ip_sym(s, field->ip, flags))
+ goto partial;
+
+ if ((flags & TRACE_ITER_PRINT_PARENT) && field->parent_ip) {
+ if (!trace_seq_printf(s, " <-"))
+ goto partial;
+ if (!seq_print_ip_sym(s,
+ field->parent_ip,
+ flags))
+ goto partial;
+ }
+ if (!trace_seq_printf(s, "\n"))
+ goto partial;
+
+ return 0;
+
+ partial:
+ return TRACE_TYPE_PARTIAL_LINE;
+}
+
+static int
+trace_fn_raw(struct trace_seq *s, struct trace_entry *entry, int flags)
+{
+ struct ftrace_entry *field;
+
+ trace_assign_type(field, entry);
+
+ if (!trace_seq_printf(s, "%lx %lx\n",
+ field->ip,
+ field->parent_ip))
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ return 0;
+}
+
+static int
+trace_fn_hex(struct trace_seq *s, struct trace_entry *entry, int flags)
+{
+ struct ftrace_entry *field;
+
+ trace_assign_type(field, entry);
+
+ SEQ_PUT_HEX_FIELD_RET(s, field->ip);
+ SEQ_PUT_HEX_FIELD_RET(s, field->parent_ip);
+
+ return 0;
+}
+
+static int
+trace_fn_bin(struct trace_seq *s, struct trace_entry *entry, int flags)
+{
+ struct ftrace_entry *field;
+
+ trace_assign_type(field, entry);
+
+ SEQ_PUT_FIELD_RET(s, field->ip);
+ SEQ_PUT_FIELD_RET(s, field->parent_ip);
+
+ return 0;
+}
+
+static struct trace_event trace_fn_event = {
+ .type = TRACE_FN,
+ .trace = trace_fn_trace,
+ .latency_trace = trace_fn_latency,
+ .raw = trace_fn_raw,
+ .hex = trace_fn_hex,
+ .binary = trace_fn_bin,
+};
+
+/* TRACE_CTX an TRACE_WAKE */
+static int
+trace_ctxwake_print(struct trace_seq *s, struct trace_entry *entry, int flags,
+ char *delim)
+{
+ struct ctx_switch_entry *field;
+ char *comm;
+ int S, T;
+
+ trace_assign_type(field, entry);
+
+ T = task_state_char(field->next_state);
+ S = task_state_char(field->prev_state);
+ comm = trace_find_cmdline(field->next_pid);
+ if (!trace_seq_printf(s, " %5d:%3d:%c %s [%03d] %5d:%3d:%c %s\n",
+ field->prev_pid,
+ field->prev_prio,
+ S, delim,
+ field->next_cpu,
+ field->next_pid,
+ field->next_prio,
+ T, comm))
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ return 0;
+}
+
+static int
+trace_ctx_print(struct trace_seq *s, struct trace_entry *entry, int flags)
+{
+ return trace_ctxwake_print(s, entry, flags, "==>");
+}
+
+static int
+trace_wake_print(struct trace_seq *s, struct trace_entry *entry, int flags)
+{
+ return trace_ctxwake_print(s, entry, flags, " +");
+}
+
+static int
+trace_ctxwake_raw(struct trace_seq *s, struct trace_entry *entry, int flags,
+ char S)
+{
+ struct ctx_switch_entry *field;
+ int T;
+
+ trace_assign_type(field, entry);
+
+ if (!S)
+ task_state_char(field->prev_state);
+ T = task_state_char(field->next_state);
+ if (!trace_seq_printf(s, "%d %d %c %d %d %d %c\n",
+ field->prev_pid,
+ field->prev_prio,
+ S,
+ field->next_cpu,
+ field->next_pid,
+ field->next_prio,
+ T))
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ return 0;
+}
+
+static int
+trace_ctx_raw(struct trace_seq *s, struct trace_entry *entry, int flags)
+{
+ return trace_ctxwake_raw(s, entry, flags, 0);
+}
+
+static int
+trace_wake_raw(struct trace_seq *s, struct trace_entry *entry, int flags)
+{
+ return trace_ctxwake_raw(s, entry, flags, '+');
+}
+
+
+static int
+trace_ctxwake_hex(struct trace_seq *s, struct trace_entry *entry, int flags,
+ char S)
+{
+ struct ctx_switch_entry *field;
+ int T;
+
+ trace_assign_type(field, entry);
+
+ if (!S)
+ task_state_char(field->prev_state);
+ T = task_state_char(field->next_state);
+
+ SEQ_PUT_HEX_FIELD_RET(s, field->prev_pid);
+ SEQ_PUT_HEX_FIELD_RET(s, field->prev_prio);
+ SEQ_PUT_HEX_FIELD_RET(s, S);
+ SEQ_PUT_HEX_FIELD_RET(s, field->next_cpu);
+ SEQ_PUT_HEX_FIELD_RET(s, field->next_pid);
+ SEQ_PUT_HEX_FIELD_RET(s, field->next_prio);
+ SEQ_PUT_HEX_FIELD_RET(s, T);
+
+ return 0;
+}
+
+static int
+trace_ctx_hex(struct trace_seq *s, struct trace_entry *entry, int flags)
+{
+ return trace_ctxwake_hex(s, entry, flags, 0);
+}
+
+static int
+trace_wake_hex(struct trace_seq *s, struct trace_entry *entry, int flags)
+{
+ return trace_ctxwake_hex(s, entry, flags, '+');
+}
+
+static int
+trace_ctxwake_bin(struct trace_seq *s, struct trace_entry *entry, int flags)
+{
+ struct ctx_switch_entry *field;
+
+ trace_assign_type(field, entry);
+
+ SEQ_PUT_FIELD_RET(s, field->prev_pid);
+ SEQ_PUT_FIELD_RET(s, field->prev_prio);
+ SEQ_PUT_FIELD_RET(s, field->prev_state);
+ SEQ_PUT_FIELD_RET(s, field->next_pid);
+ SEQ_PUT_FIELD_RET(s, field->next_prio);
+ SEQ_PUT_FIELD_RET(s, field->next_state);
+
+ return 0;
+}
+
+static struct trace_event trace_ctx_event = {
+ .type = TRACE_CTX,
+ .trace = trace_ctx_print,
+ .latency_trace = trace_ctx_print,
+ .raw = trace_ctx_raw,
+ .hex = trace_ctx_hex,
+ .binary = trace_ctxwake_bin,
+};
+
+static struct trace_event trace_wake_event = {
+ .type = TRACE_WAKE,
+ .trace = trace_wake_print,
+ .latency_trace = trace_wake_print,
+ .raw = trace_wake_raw,
+ .hex = trace_wake_hex,
+ .binary = trace_ctxwake_bin,
+};
+
+/* TRACE_SPECIAL */
+static int
+trace_special_print(struct trace_seq *s, struct trace_entry *entry, int flags)
+{
+ struct special_entry *field;
+
+ trace_assign_type(field, entry);
+
+ if (!trace_seq_printf(s, "# %ld %ld %ld\n",
+ field->arg1,
+ field->arg2,
+ field->arg3))
+ return TRACE_TYPE_PARTIAL_LINE;
+
+ return 0;
+}
+
+static int
+trace_special_hex(struct trace_seq *s, struct trace_entry *entry, int flags)
+{
+ struct special_entry *field;
+
+ trace_assign_type(field, entry);
+
+ SEQ_PUT_HEX_FIELD_RET(s, field->arg1);
+ SEQ_PUT_HEX_FIELD_RET(s, field->arg2);
+ SEQ_PUT_HEX_FIELD_RET(s, field->arg3);
+
+ return 0;
+}
+
+static int
+trace_special_bin(struct trace_seq *s, struct trace_entry *entry, int flags)
+{
+ struct special_entry *field;
+
+ trace_assign_type(field, entry);
+
+ SEQ_PUT_FIELD_RET(s, field->arg1);
+ SEQ_PUT_FIELD_RET(s, field->arg2);
+ SEQ_PUT_FIELD_RET(s, field->arg3);
+
+ return 0;
+}
+
+static struct trace_event trace_special_event = {
+ .type = TRACE_SPECIAL,
+ .trace = trace_special_print,
+ .latency_trace = trace_special_print,
+ .raw = trace_special_print,
+ .hex = trace_special_hex,
+ .binary = trace_special_bin,
+};
+
+/* TRACE_STACK */
+
+static int
+trace_stack_print(struct trace_seq *s, struct trace_entry *entry, int flags)
+{
+ struct stack_entry *field;
+ int i;
+
+ trace_assign_type(field, entry);
+
+ for (i = 0; i < FTRACE_STACK_ENTRIES; i++) {
+ if (i) {
+ if (!trace_seq_puts(s, " <= "))
+ goto partial;
+
+ if (!seq_print_ip_sym(s, field->caller[i], flags))
+ goto partial;
+ }
+ if (!trace_seq_puts(s, "\n"))
+ goto partial;
+ }
+
+ return 0;
+
+ partial:
+ return TRACE_TYPE_PARTIAL_LINE;
+}
+
+static struct trace_event trace_stack_event = {
+ .type = TRACE_STACK,
+ .trace = trace_stack_print,
+ .latency_trace = trace_stack_print,
+ .raw = trace_special_print,
+ .hex = trace_special_hex,
+ .binary = trace_special_bin,
+};
+
+/* TRACE_USER_STACK */
+static int
+trace_user_stack_print(struct trace_seq *s, struct trace_entry *entry,
+ int flags)
+{
+ struct userstack_entry *field;
+
+ trace_assign_type(field, entry);
+
+ if (!seq_print_userip_objs(field, s, flags))
+ goto partial;
+
+ if (!trace_seq_putc(s, '\n'))
+ goto partial;
+
+ return 0;
+
+ partial:
+ return TRACE_TYPE_PARTIAL_LINE;
+}
+
+static struct trace_event trace_user_stack_event = {
+ .type = TRACE_USER_STACK,
+ .trace = trace_user_stack_print,
+ .latency_trace = trace_user_stack_print,
+ .raw = trace_special_print,
+ .hex = trace_special_hex,
+ .binary = trace_special_bin,
+};
+
+/* TRACE_PRINT */
+static int
+trace_print_print(struct trace_seq *s, struct trace_entry *entry, int flags)
+{
+ struct print_entry *field;
+
+ trace_assign_type(field, entry);
+
+ if (!seq_print_ip_sym(s, field->ip, flags))
+ goto partial;
+
+ if (!trace_seq_printf(s, ": %s", field->buf))
+ goto partial;
+
+ return 0;
+
+ partial:
+ return TRACE_TYPE_PARTIAL_LINE;
+}
+
+static int
+trace_print_raw(struct trace_seq *s, struct trace_entry *entry, int flags)
+{
+ struct print_entry *field;
+
+ trace_assign_type(field, entry);
+
+ if (!trace_seq_printf(s, "# %lx %s", field->ip, field->buf))
+ goto partial;
+
+ return 0;
+
+ partial:
+ return TRACE_TYPE_PARTIAL_LINE;
+}
+
+static struct trace_event trace_print_event = {
+ .type = TRACE_PRINT,
+ .trace = trace_print_print,
+ .latency_trace = trace_print_print,
+ .raw = trace_print_raw,
+ .hex = trace_nop_print,
+ .binary = trace_nop_print,
+};
+
+static struct trace_event *events[] __initdata = {
+ &trace_fn_event,
+ &trace_ctx_event,
+ &trace_wake_event,
+ &trace_special_event,
+ &trace_stack_event,
+ &trace_user_stack_event,
+ &trace_print_event,
+ NULL
+};
+
+__init static int init_events(void)
+{
+ struct trace_event *event;
+ int i, ret;
+
+ for (i = 0; events[i]; i++) {
+ event = events[i];
+
+ ret = register_ftrace_event(event);
+ if (!ret) {
+ printk(KERN_WARNING "event %d failed to register\n",
+ event->type);
+ WARN_ON_ONCE(1);
+ }
+ }
+
+ return 0;
+}
+device_initcall(init_events);
diff --git a/kernel/trace/trace_output.h b/kernel/trace/trace_output.h
new file mode 100644
index 000000000000..1cbab5e3dc99
--- /dev/null
+++ b/kernel/trace/trace_output.h
@@ -0,0 +1,60 @@
+#ifndef __TRACE_EVENTS_H
+#define __TRACE_EVENTS_H
+
+#include "trace.h"
+
+typedef int (*trace_print_func)(struct trace_seq *s, struct trace_entry *entry,
+ int flags);
+
+struct trace_event {
+ struct hlist_node node;
+ int type;
+ trace_print_func trace;
+ trace_print_func latency_trace;
+ trace_print_func raw;
+ trace_print_func hex;
+ trace_print_func binary;
+};
+
+extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
+ __attribute__ ((format (printf, 2, 3)));
+extern int
+seq_print_ip_sym(struct trace_seq *s, unsigned long ip,
+ unsigned long sym_flags);
+extern ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
+ size_t cnt);
+int trace_seq_puts(struct trace_seq *s, const char *str);
+int trace_seq_putc(struct trace_seq *s, unsigned char c);
+int trace_seq_putmem(struct trace_seq *s, void *mem, size_t len);
+int trace_seq_putmem_hex(struct trace_seq *s, void *mem, size_t len);
+int trace_seq_path(struct trace_seq *s, struct path *path);
+int seq_print_userip_objs(const struct userstack_entry *entry,
+ struct trace_seq *s, unsigned long sym_flags);
+int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
+ unsigned long ip, unsigned long sym_flags);
+
+struct trace_event *ftrace_find_event(int type);
+int register_ftrace_event(struct trace_event *event);
+int unregister_ftrace_event(struct trace_event *event);
+
+int
+trace_nop_print(struct trace_seq *s, struct trace_entry *entry, int flags);
+
+#define MAX_MEMHEX_BYTES 8
+#define HEX_CHARS (MAX_MEMHEX_BYTES*2 + 1)
+
+#define SEQ_PUT_FIELD_RET(s, x) \
+do { \
+ if (!trace_seq_putmem(s, &(x), sizeof(x))) \
+ return TRACE_TYPE_PARTIAL_LINE; \
+} while (0)
+
+#define SEQ_PUT_HEX_FIELD_RET(s, x) \
+do { \
+ BUILD_BUG_ON(sizeof(x) > MAX_MEMHEX_BYTES); \
+ if (!trace_seq_putmem_hex(s, &(x), sizeof(x))) \
+ return TRACE_TYPE_PARTIAL_LINE; \
+} while (0)
+
+#endif
+
diff --git a/kernel/trace/trace_power.c b/kernel/trace/trace_power.c
index 7bda248daf55..faa6ab7a1f5c 100644
--- a/kernel/trace/trace_power.c
+++ b/kernel/trace/trace_power.c
@@ -16,6 +16,7 @@
#include <linux/module.h>
#include "trace.h"
+#include "trace_output.h"
static struct trace_array *power_trace;
static int __read_mostly trace_power_enabled;
diff --git a/kernel/trace/trace_sched_wakeup.c b/kernel/trace/trace_sched_wakeup.c
index 42ae1e77b6b3..93cecda650b2 100644
--- a/kernel/trace/trace_sched_wakeup.c
+++ b/kernel/trace/trace_sched_wakeup.c
@@ -25,6 +25,7 @@ static int __read_mostly tracer_enabled;
static struct task_struct *wakeup_task;
static int wakeup_cpu;
static unsigned wakeup_prio = -1;
+static int wakeup_rt;
static raw_spinlock_t wakeup_lock =
(raw_spinlock_t)__RAW_SPIN_LOCK_UNLOCKED;
@@ -152,6 +153,7 @@ probe_wakeup_sched_switch(struct rq *rq, struct task_struct *prev,
goto out_unlock;
trace_function(wakeup_trace, data, CALLER_ADDR1, CALLER_ADDR2, flags, pc);
+ tracing_sched_switch_trace(wakeup_trace, data, prev, next, flags, pc);
/*
* usecs conversion is slow so we try to delay the conversion
@@ -213,6 +215,7 @@ static void wakeup_reset(struct trace_array *tr)
static void
probe_wakeup(struct rq *rq, struct task_struct *p, int success)
{
+ struct trace_array_cpu *data;
int cpu = smp_processor_id();
unsigned long flags;
long disabled;
@@ -224,7 +227,7 @@ probe_wakeup(struct rq *rq, struct task_struct *p, int success)
tracing_record_cmdline(p);
tracing_record_cmdline(current);
- if (likely(!rt_task(p)) ||
+ if ((wakeup_rt && !rt_task(p)) ||
p->prio >= wakeup_prio ||
p->prio >= current->prio)
return;
@@ -252,9 +255,12 @@ probe_wakeup(struct rq *rq, struct task_struct *p, int success)
local_save_flags(flags);
- wakeup_trace->data[wakeup_cpu]->preempt_timestamp = ftrace_now(cpu);
- trace_function(wakeup_trace, wakeup_trace->data[wakeup_cpu],
- CALLER_ADDR1, CALLER_ADDR2, flags, pc);
+ data = wakeup_trace->data[wakeup_cpu];
+ data->preempt_timestamp = ftrace_now(cpu);
+ tracing_sched_wakeup_trace(wakeup_trace, data, p, current,
+ flags, pc);
+ trace_function(wakeup_trace, data, CALLER_ADDR1, CALLER_ADDR2,
+ flags, pc);
out_locked:
__raw_spin_unlock(&wakeup_lock);
@@ -262,12 +268,6 @@ out:
atomic_dec(&wakeup_trace->data[cpu]->disabled);
}
-/*
- * save_tracer_enabled is used to save the state of the tracer_enabled
- * variable when we disable it when we open a trace output file.
- */
-static int save_tracer_enabled;
-
static void start_wakeup_tracer(struct trace_array *tr)
{
int ret;
@@ -306,13 +306,10 @@ static void start_wakeup_tracer(struct trace_array *tr)
register_ftrace_function(&trace_ops);
- if (tracing_is_enabled()) {
+ if (tracing_is_enabled())
tracer_enabled = 1;
- save_tracer_enabled = 1;
- } else {
+ else
tracer_enabled = 0;
- save_tracer_enabled = 0;
- }
return;
fail_deprobe_wake_new:
@@ -324,14 +321,13 @@ fail_deprobe:
static void stop_wakeup_tracer(struct trace_array *tr)
{
tracer_enabled = 0;
- save_tracer_enabled = 0;
unregister_ftrace_function(&trace_ops);
unregister_trace_sched_switch(probe_wakeup_sched_switch);
unregister_trace_sched_wakeup_new(probe_wakeup);
unregister_trace_sched_wakeup(probe_wakeup);
}
-static int wakeup_tracer_init(struct trace_array *tr)
+static int __wakeup_tracer_init(struct trace_array *tr)
{
tracing_max_latency = 0;
wakeup_trace = tr;
@@ -339,6 +335,18 @@ static int wakeup_tracer_init(struct trace_array *tr)
return 0;
}
+static int wakeup_tracer_init(struct trace_array *tr)
+{
+ wakeup_rt = 0;
+ return __wakeup_tracer_init(tr);
+}
+
+static int wakeup_rt_tracer_init(struct trace_array *tr)
+{
+ wakeup_rt = 1;
+ return __wakeup_tracer_init(tr);
+}
+
static void wakeup_tracer_reset(struct trace_array *tr)
{
stop_wakeup_tracer(tr);
@@ -350,28 +358,11 @@ static void wakeup_tracer_start(struct trace_array *tr)
{
wakeup_reset(tr);
tracer_enabled = 1;
- save_tracer_enabled = 1;
}
static void wakeup_tracer_stop(struct trace_array *tr)
{
tracer_enabled = 0;
- save_tracer_enabled = 0;
-}
-
-static void wakeup_tracer_open(struct trace_iterator *iter)
-{
- /* stop the trace while dumping */
- tracer_enabled = 0;
-}
-
-static void wakeup_tracer_close(struct trace_iterator *iter)
-{
- /* forget about any processes we were recording */
- if (save_tracer_enabled) {
- wakeup_reset(iter->tr);
- tracer_enabled = 1;
- }
}
static struct tracer wakeup_tracer __read_mostly =
@@ -381,8 +372,19 @@ static struct tracer wakeup_tracer __read_mostly =
.reset = wakeup_tracer_reset,
.start = wakeup_tracer_start,
.stop = wakeup_tracer_stop,
- .open = wakeup_tracer_open,
- .close = wakeup_tracer_close,
+ .print_max = 1,
+#ifdef CONFIG_FTRACE_SELFTEST
+ .selftest = trace_selftest_startup_wakeup,
+#endif
+};
+
+static struct tracer wakeup_rt_tracer __read_mostly =
+{
+ .name = "wakeup_rt",
+ .init = wakeup_rt_tracer_init,
+ .reset = wakeup_tracer_reset,
+ .start = wakeup_tracer_start,
+ .stop = wakeup_tracer_stop,
.print_max = 1,
#ifdef CONFIG_FTRACE_SELFTEST
.selftest = trace_selftest_startup_wakeup,
@@ -397,6 +399,10 @@ __init static int init_wakeup_tracer(void)
if (ret)
return ret;
+ ret = register_tracer(&wakeup_rt_tracer);
+ if (ret)
+ return ret;
+
return 0;
}
device_initcall(init_wakeup_tracer);
diff --git a/kernel/trace/trace_selftest.c b/kernel/trace/trace_selftest.c
index 88c8eb70f54a..5013812578b1 100644
--- a/kernel/trace/trace_selftest.c
+++ b/kernel/trace/trace_selftest.c
@@ -9,7 +9,6 @@ static inline int trace_valid_entry(struct trace_entry *entry)
case TRACE_FN:
case TRACE_CTX:
case TRACE_WAKE:
- case TRACE_CONT:
case TRACE_STACK:
case TRACE_PRINT:
case TRACE_SPECIAL:
diff --git a/kernel/trace/trace_stat.c b/kernel/trace/trace_stat.c
new file mode 100644
index 000000000000..eae9cef39291
--- /dev/null
+++ b/kernel/trace/trace_stat.c
@@ -0,0 +1,319 @@
+/*
+ * Infrastructure for statistic tracing (histogram output).
+ *
+ * Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com>
+ *
+ * Based on the code from trace_branch.c which is
+ * Copyright (C) 2008 Steven Rostedt <srostedt@redhat.com>
+ *
+ */
+
+
+#include <linux/list.h>
+#include <linux/debugfs.h>
+#include "trace_stat.h"
+#include "trace.h"
+
+
+/* List of stat entries from a tracer */
+struct trace_stat_list {
+ struct list_head list;
+ void *stat;
+};
+
+/* A stat session is the stats output in one file */
+struct tracer_stat_session {
+ struct list_head session_list;
+ struct tracer_stat *ts;
+ struct list_head stat_list;
+ struct mutex stat_mutex;
+ struct dentry *file;
+};
+
+/* All of the sessions currently in use. Each stat file embeed one session */
+static LIST_HEAD(all_stat_sessions);
+static DEFINE_MUTEX(all_stat_sessions_mutex);
+
+/* The root directory for all stat files */
+static struct dentry *stat_dir;
+
+
+static void reset_stat_session(struct tracer_stat_session *session)
+{
+ struct trace_stat_list *node, *next;
+
+ list_for_each_entry_safe(node, next, &session->stat_list, list)
+ kfree(node);
+
+ INIT_LIST_HEAD(&session->stat_list);
+}
+
+static void destroy_session(struct tracer_stat_session *session)
+{
+ debugfs_remove(session->file);
+ reset_stat_session(session);
+ mutex_destroy(&session->stat_mutex);
+ kfree(session);
+}
+
+/*
+ * For tracers that don't provide a stat_cmp callback.
+ * This one will force an immediate insertion on tail of
+ * the list.
+ */
+static int dummy_cmp(void *p1, void *p2)
+{
+ return 1;
+}
+
+/*
+ * Initialize the stat list at each trace_stat file opening.
+ * All of these copies and sorting are required on all opening
+ * since the stats could have changed between two file sessions.
+ */
+static int stat_seq_init(struct tracer_stat_session *session)
+{
+ struct trace_stat_list *iter_entry, *new_entry;
+ struct tracer_stat *ts = session->ts;
+ void *prev_stat;
+ int ret = 0;
+ int i;
+
+ mutex_lock(&session->stat_mutex);
+ reset_stat_session(session);
+
+ if (!ts->stat_cmp)
+ ts->stat_cmp = dummy_cmp;
+
+ /*
+ * The first entry. Actually this is the second, but the first
+ * one (the stat_list head) is pointless.
+ */
+ new_entry = kmalloc(sizeof(struct trace_stat_list), GFP_KERNEL);
+ if (!new_entry) {
+ ret = -ENOMEM;
+ goto exit;
+ }
+
+ INIT_LIST_HEAD(&new_entry->list);
+
+ list_add(&new_entry->list, &session->stat_list);
+
+ new_entry->stat = ts->stat_start();
+ prev_stat = new_entry->stat;
+
+ /*
+ * Iterate over the tracer stat entries and store them in a sorted
+ * list.
+ */
+ for (i = 1; ; i++) {
+ new_entry = kmalloc(sizeof(struct trace_stat_list), GFP_KERNEL);
+ if (!new_entry) {
+ ret = -ENOMEM;
+ goto exit_free_list;
+ }
+
+ INIT_LIST_HEAD(&new_entry->list);
+ new_entry->stat = ts->stat_next(prev_stat, i);
+
+ /* End of insertion */
+ if (!new_entry->stat)
+ break;
+
+ list_for_each_entry(iter_entry, &session->stat_list, list) {
+
+ /* Insertion with a descendent sorting */
+ if (ts->stat_cmp(new_entry->stat,
+ iter_entry->stat) > 0) {
+
+ list_add_tail(&new_entry->list,
+ &iter_entry->list);
+ break;
+
+ /* The current smaller value */
+ } else if (list_is_last(&iter_entry->list,
+ &session->stat_list)) {
+ list_add(&new_entry->list, &iter_entry->list);
+ break;
+ }
+ }
+
+ prev_stat = new_entry->stat;
+ }
+exit:
+ mutex_unlock(&session->stat_mutex);
+ return ret;
+
+exit_free_list:
+ reset_stat_session(session);
+ mutex_unlock(&session->stat_mutex);
+ return ret;
+}
+
+
+static void *stat_seq_start(struct seq_file *s, loff_t *pos)
+{
+ struct tracer_stat_session *session = s->private;
+
+ /* Prevent from tracer switch or stat_list modification */
+ mutex_lock(&session->stat_mutex);
+
+ /* If we are in the beginning of the file, print the headers */
+ if (!*pos && session->ts->stat_headers)
+ session->ts->stat_headers(s);
+
+ return seq_list_start(&session->stat_list, *pos);
+}
+
+static void *stat_seq_next(struct seq_file *s, void *p, loff_t *pos)
+{
+ struct tracer_stat_session *session = s->private;
+
+ return seq_list_next(p, &session->stat_list, pos);
+}
+
+static void stat_seq_stop(struct seq_file *s, void *p)
+{
+ struct tracer_stat_session *session = s->private;
+ mutex_unlock(&session->stat_mutex);
+}
+
+static int stat_seq_show(struct seq_file *s, void *v)
+{
+ struct tracer_stat_session *session = s->private;
+ struct trace_stat_list *l = list_entry(v, struct trace_stat_list, list);
+
+ return session->ts->stat_show(s, l->stat);
+}
+
+static const struct seq_operations trace_stat_seq_ops = {
+ .start = stat_seq_start,
+ .next = stat_seq_next,
+ .stop = stat_seq_stop,
+ .show = stat_seq_show
+};
+
+/* The session stat is refilled and resorted at each stat file opening */
+static int tracing_stat_open(struct inode *inode, struct file *file)
+{
+ int ret;
+
+ struct tracer_stat_session *session = inode->i_private;
+
+ ret = seq_open(file, &trace_stat_seq_ops);
+ if (!ret) {
+ struct seq_file *m = file->private_data;
+ m->private = session;
+ ret = stat_seq_init(session);
+ }
+
+ return ret;
+}
+
+/*
+ * Avoid consuming memory with our now useless list.
+ */
+static int tracing_stat_release(struct inode *i, struct file *f)
+{
+ struct tracer_stat_session *session = i->i_private;
+
+ mutex_lock(&session->stat_mutex);
+ reset_stat_session(session);
+ mutex_unlock(&session->stat_mutex);
+
+ return 0;
+}
+
+static const struct file_operations tracing_stat_fops = {
+ .open = tracing_stat_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = tracing_stat_release
+};
+
+static int tracing_stat_init(void)
+{
+ struct dentry *d_tracing;
+
+ d_tracing = tracing_init_dentry();
+
+ stat_dir = debugfs_create_dir("trace_stat", d_tracing);
+ if (!stat_dir)
+ pr_warning("Could not create debugfs "
+ "'trace_stat' entry\n");
+ return 0;
+}
+
+static int init_stat_file(struct tracer_stat_session *session)
+{
+ if (!stat_dir && tracing_stat_init())
+ return -ENODEV;
+
+ session->file = debugfs_create_file(session->ts->name, 0644,
+ stat_dir,
+ session, &tracing_stat_fops);
+ if (!session->file)
+ return -ENOMEM;
+ return 0;
+}
+
+int register_stat_tracer(struct tracer_stat *trace)
+{
+ struct tracer_stat_session *session, *node, *tmp;
+ int ret;
+
+ if (!trace)
+ return -EINVAL;
+
+ if (!trace->stat_start || !trace->stat_next || !trace->stat_show)
+ return -EINVAL;
+
+ /* Already registered? */
+ mutex_lock(&all_stat_sessions_mutex);
+ list_for_each_entry_safe(node, tmp, &all_stat_sessions, session_list) {
+ if (node->ts == trace) {
+ mutex_unlock(&all_stat_sessions_mutex);
+ return -EINVAL;
+ }
+ }
+ mutex_unlock(&all_stat_sessions_mutex);
+
+ /* Init the session */
+ session = kmalloc(sizeof(struct tracer_stat_session), GFP_KERNEL);
+ if (!session)
+ return -ENOMEM;
+
+ session->ts = trace;
+ INIT_LIST_HEAD(&session->session_list);
+ INIT_LIST_HEAD(&session->stat_list);
+ mutex_init(&session->stat_mutex);
+ session->file = NULL;
+
+ ret = init_stat_file(session);
+ if (ret) {
+ destroy_session(session);
+ return ret;
+ }
+
+ /* Register */
+ mutex_lock(&all_stat_sessions_mutex);
+ list_add_tail(&session->session_list, &all_stat_sessions);
+ mutex_unlock(&all_stat_sessions_mutex);
+
+ return 0;
+}
+
+void unregister_stat_tracer(struct tracer_stat *trace)
+{
+ struct tracer_stat_session *node, *tmp;
+
+ mutex_lock(&all_stat_sessions_mutex);
+ list_for_each_entry_safe(node, tmp, &all_stat_sessions, session_list) {
+ if (node->ts == trace) {
+ list_del(&node->session_list);
+ destroy_session(node);
+ break;
+ }
+ }
+ mutex_unlock(&all_stat_sessions_mutex);
+}
diff --git a/kernel/trace/trace_stat.h b/kernel/trace/trace_stat.h
new file mode 100644
index 000000000000..202274cf7f3d
--- /dev/null
+++ b/kernel/trace/trace_stat.h
@@ -0,0 +1,31 @@
+#ifndef __TRACE_STAT_H
+#define __TRACE_STAT_H
+
+#include <linux/seq_file.h>
+
+/*
+ * If you want to provide a stat file (one-shot statistics), fill
+ * an iterator with stat_start/stat_next and a stat_show callbacks.
+ * The others callbacks are optional.
+ */
+struct tracer_stat {
+ /* The name of your stat file */
+ const char *name;
+ /* Iteration over statistic entries */
+ void *(*stat_start)(void);
+ void *(*stat_next)(void *prev, int idx);
+ /* Compare two entries for stats sorting */
+ int (*stat_cmp)(void *p1, void *p2);
+ /* Print a stat entry */
+ int (*stat_show)(struct seq_file *s, void *p);
+ /* Print the headers of your stat entries */
+ int (*stat_headers)(struct seq_file *s);
+};
+
+/*
+ * Destroy or create a stat file
+ */
+extern int register_stat_tracer(struct tracer_stat *trace);
+extern void unregister_stat_tracer(struct tracer_stat *trace);
+
+#endif /* __TRACE_STAT_H */
diff --git a/kernel/trace/trace_workqueue.c b/kernel/trace/trace_workqueue.c
new file mode 100644
index 000000000000..4664990fe9c5
--- /dev/null
+++ b/kernel/trace/trace_workqueue.c
@@ -0,0 +1,281 @@
+/*
+ * Workqueue statistical tracer.
+ *
+ * Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com>
+ *
+ */
+
+
+#include <trace/workqueue.h>
+#include <linux/list.h>
+#include <linux/percpu.h>
+#include "trace_stat.h"
+#include "trace.h"
+
+
+/* A cpu workqueue thread */
+struct cpu_workqueue_stats {
+ struct list_head list;
+/* Useful to know if we print the cpu headers */
+ bool first_entry;
+ int cpu;
+ pid_t pid;
+/* Can be inserted from interrupt or user context, need to be atomic */
+ atomic_t inserted;
+/*
+ * Don't need to be atomic, works are serialized in a single workqueue thread
+ * on a single CPU.
+ */
+ unsigned int executed;
+};
+
+/* List of workqueue threads on one cpu */
+struct workqueue_global_stats {
+ struct list_head list;
+ spinlock_t lock;
+};
+
+/* Don't need a global lock because allocated before the workqueues, and
+ * never freed.
+ */
+static DEFINE_PER_CPU(struct workqueue_global_stats, all_workqueue_stat);
+#define workqueue_cpu_stat(cpu) (&per_cpu(all_workqueue_stat, cpu))
+
+/* Insertion of a work */
+static void
+probe_workqueue_insertion(struct task_struct *wq_thread,
+ struct work_struct *work)
+{
+ int cpu = cpumask_first(&wq_thread->cpus_allowed);
+ struct cpu_workqueue_stats *node, *next;
+ unsigned long flags;
+
+ spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
+ list_for_each_entry_safe(node, next, &workqueue_cpu_stat(cpu)->list,
+ list) {
+ if (node->pid == wq_thread->pid) {
+ atomic_inc(&node->inserted);
+ goto found;
+ }
+ }
+ pr_debug("trace_workqueue: entry not found\n");
+found:
+ spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
+}
+
+/* Execution of a work */
+static void
+probe_workqueue_execution(struct task_struct *wq_thread,
+ struct work_struct *work)
+{
+ int cpu = cpumask_first(&wq_thread->cpus_allowed);
+ struct cpu_workqueue_stats *node, *next;
+ unsigned long flags;
+
+ spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
+ list_for_each_entry_safe(node, next, &workqueue_cpu_stat(cpu)->list,
+ list) {
+ if (node->pid == wq_thread->pid) {
+ node->executed++;
+ goto found;
+ }
+ }
+ pr_debug("trace_workqueue: entry not found\n");
+found:
+ spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
+}
+
+/* Creation of a cpu workqueue thread */
+static void probe_workqueue_creation(struct task_struct *wq_thread, int cpu)
+{
+ struct cpu_workqueue_stats *cws;
+ unsigned long flags;
+
+ WARN_ON(cpu < 0 || cpu >= num_possible_cpus());
+
+ /* Workqueues are sometimes created in atomic context */
+ cws = kzalloc(sizeof(struct cpu_workqueue_stats), GFP_ATOMIC);
+ if (!cws) {
+ pr_warning("trace_workqueue: not enough memory\n");
+ return;
+ }
+ tracing_record_cmdline(wq_thread);
+
+ INIT_LIST_HEAD(&cws->list);
+ cws->cpu = cpu;
+
+ cws->pid = wq_thread->pid;
+
+ spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
+ if (list_empty(&workqueue_cpu_stat(cpu)->list))
+ cws->first_entry = true;
+ list_add_tail(&cws->list, &workqueue_cpu_stat(cpu)->list);
+ spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
+}
+
+/* Destruction of a cpu workqueue thread */
+static void probe_workqueue_destruction(struct task_struct *wq_thread)
+{
+ /* Workqueue only execute on one cpu */
+ int cpu = cpumask_first(&wq_thread->cpus_allowed);
+ struct cpu_workqueue_stats *node, *next;
+ unsigned long flags;
+
+ spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
+ list_for_each_entry_safe(node, next, &workqueue_cpu_stat(cpu)->list,
+ list) {
+ if (node->pid == wq_thread->pid) {
+ list_del(&node->list);
+ kfree(node);
+ goto found;
+ }
+ }
+
+ pr_debug("trace_workqueue: don't find workqueue to destroy\n");
+found:
+ spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
+
+}
+
+static struct cpu_workqueue_stats *workqueue_stat_start_cpu(int cpu)
+{
+ unsigned long flags;
+ struct cpu_workqueue_stats *ret = NULL;
+
+
+ spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
+
+ if (!list_empty(&workqueue_cpu_stat(cpu)->list))
+ ret = list_entry(workqueue_cpu_stat(cpu)->list.next,
+ struct cpu_workqueue_stats, list);
+
+ spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
+
+ return ret;
+}
+
+static void *workqueue_stat_start(void)
+{
+ int cpu;
+ void *ret = NULL;
+
+ for_each_possible_cpu(cpu) {
+ ret = workqueue_stat_start_cpu(cpu);
+ if (ret)
+ return ret;
+ }
+ return NULL;
+}
+
+static void *workqueue_stat_next(void *prev, int idx)
+{
+ struct cpu_workqueue_stats *prev_cws = prev;
+ int cpu = prev_cws->cpu;
+ unsigned long flags;
+ void *ret = NULL;
+
+ spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
+ if (list_is_last(&prev_cws->list, &workqueue_cpu_stat(cpu)->list)) {
+ spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
+ for (++cpu ; cpu < num_possible_cpus(); cpu++) {
+ ret = workqueue_stat_start_cpu(cpu);
+ if (ret)
+ return ret;
+ }
+ return NULL;
+ }
+ spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
+
+ return list_entry(prev_cws->list.next, struct cpu_workqueue_stats,
+ list);
+}
+
+static int workqueue_stat_show(struct seq_file *s, void *p)
+{
+ struct cpu_workqueue_stats *cws = p;
+ unsigned long flags;
+ int cpu = cws->cpu;
+
+ seq_printf(s, "%3d %6d %6u %s\n", cws->cpu,
+ atomic_read(&cws->inserted),
+ cws->executed,
+ trace_find_cmdline(cws->pid));
+
+ spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
+ if (&cws->list == workqueue_cpu_stat(cpu)->list.next)
+ seq_printf(s, "\n");
+ spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
+
+ return 0;
+}
+
+static int workqueue_stat_headers(struct seq_file *s)
+{
+ seq_printf(s, "# CPU INSERTED EXECUTED NAME\n");
+ seq_printf(s, "# | | | |\n\n");
+ return 0;
+}
+
+struct tracer_stat workqueue_stats __read_mostly = {
+ .name = "workqueues",
+ .stat_start = workqueue_stat_start,
+ .stat_next = workqueue_stat_next,
+ .stat_show = workqueue_stat_show,
+ .stat_headers = workqueue_stat_headers
+};
+
+
+int __init stat_workqueue_init(void)
+{
+ if (register_stat_tracer(&workqueue_stats)) {
+ pr_warning("Unable to register workqueue stat tracer\n");
+ return 1;
+ }
+
+ return 0;
+}
+fs_initcall(stat_workqueue_init);
+
+/*
+ * Workqueues are created very early, just after pre-smp initcalls.
+ * So we must register our tracepoints at this stage.
+ */
+int __init trace_workqueue_early_init(void)
+{
+ int ret, cpu;
+
+ ret = register_trace_workqueue_insertion(probe_workqueue_insertion);
+ if (ret)
+ goto out;
+
+ ret = register_trace_workqueue_execution(probe_workqueue_execution);
+ if (ret)
+ goto no_insertion;
+
+ ret = register_trace_workqueue_creation(probe_workqueue_creation);
+ if (ret)
+ goto no_execution;
+
+ ret = register_trace_workqueue_destruction(probe_workqueue_destruction);
+ if (ret)
+ goto no_creation;
+
+ for_each_possible_cpu(cpu) {
+ spin_lock_init(&workqueue_cpu_stat(cpu)->lock);
+ INIT_LIST_HEAD(&workqueue_cpu_stat(cpu)->list);
+ }
+
+ return 0;
+
+no_creation:
+ unregister_trace_workqueue_creation(probe_workqueue_creation);
+no_execution:
+ unregister_trace_workqueue_execution(probe_workqueue_execution);
+no_insertion:
+ unregister_trace_workqueue_insertion(probe_workqueue_insertion);
+out:
+ pr_warning("trace_workqueue: unable to trace workqueues\n");
+
+ return 1;
+}
+early_initcall(trace_workqueue_early_init);
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 2f445833ae37..1fc2bc20603f 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -33,6 +33,7 @@
#include <linux/kallsyms.h>
#include <linux/debug_locks.h>
#include <linux/lockdep.h>
+#include <trace/workqueue.h>
/*
* The per-CPU workqueue (if single thread, we always use the first
@@ -125,9 +126,13 @@ struct cpu_workqueue_struct *get_wq_data(struct work_struct *work)
return (void *) (atomic_long_read(&work->data) & WORK_STRUCT_WQ_DATA_MASK);
}
+DEFINE_TRACE(workqueue_insertion);
+
static void insert_work(struct cpu_workqueue_struct *cwq,
struct work_struct *work, struct list_head *head)
{
+ trace_workqueue_insertion(cwq->thread, work);
+
set_wq_data(work, cwq);
/*
* Ensure that we get the right work->data if we see the
@@ -259,6 +264,8 @@ int queue_delayed_work_on(int cpu, struct workqueue_struct *wq,
}
EXPORT_SYMBOL_GPL(queue_delayed_work_on);
+DEFINE_TRACE(workqueue_execution);
+
static void run_workqueue(struct cpu_workqueue_struct *cwq)
{
spin_lock_irq(&cwq->lock);
@@ -284,7 +291,7 @@ static void run_workqueue(struct cpu_workqueue_struct *cwq)
*/
struct lockdep_map lockdep_map = work->lockdep_map;
#endif
-
+ trace_workqueue_execution(cwq->thread, work);
cwq->current_work = work;
list_del_init(cwq->worklist.next);
spin_unlock_irq(&cwq->lock);
@@ -765,6 +772,8 @@ init_cpu_workqueue(struct workqueue_struct *wq, int cpu)
return cwq;
}
+DEFINE_TRACE(workqueue_creation);
+
static int create_workqueue_thread(struct cpu_workqueue_struct *cwq, int cpu)
{
struct sched_param param = { .sched_priority = MAX_RT_PRIO-1 };
@@ -787,6 +796,8 @@ static int create_workqueue_thread(struct cpu_workqueue_struct *cwq, int cpu)
sched_setscheduler_nocheck(p, SCHED_FIFO, &param);
cwq->thread = p;
+ trace_workqueue_creation(cwq->thread, cpu);
+
return 0;
}
@@ -868,6 +879,8 @@ struct workqueue_struct *__create_workqueue_key(const char *name,
}
EXPORT_SYMBOL_GPL(__create_workqueue_key);
+DEFINE_TRACE(workqueue_destruction);
+
static void cleanup_workqueue_thread(struct cpu_workqueue_struct *cwq)
{
/*
@@ -891,6 +904,7 @@ static void cleanup_workqueue_thread(struct cpu_workqueue_struct *cwq)
* checks list_empty(), and a "normal" queue_work() can't use
* a dead CPU.
*/
+ trace_workqueue_destruction(cwq->thread);
kthread_stop(cwq->thread);
cwq->thread = NULL;
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-22 03:57:00 +0000