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Diffstat (limited to 'kernel/trace/trace.c')
-rw-r--r--kernel/trace/trace.c94
1 files changed, 81 insertions, 13 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index ff1c4b20cd0a..c4238b441624 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1431,7 +1431,7 @@ update_max_tr_single(struct trace_array *tr, struct task_struct *tsk, int cpu)
}
#endif /* CONFIG_TRACER_MAX_TRACE */
-static int wait_on_pipe(struct trace_iterator *iter, bool full)
+static int wait_on_pipe(struct trace_iterator *iter, int full)
{
/* Iterators are static, they should be filled or empty */
if (trace_buffer_iter(iter, iter->cpu_file))
@@ -1681,7 +1681,7 @@ void tracing_reset(struct trace_buffer *buf, int cpu)
ring_buffer_record_disable(buffer);
/* Make sure all commits have finished */
- synchronize_sched();
+ synchronize_rcu();
ring_buffer_reset_cpu(buffer, cpu);
ring_buffer_record_enable(buffer);
@@ -1698,7 +1698,7 @@ void tracing_reset_online_cpus(struct trace_buffer *buf)
ring_buffer_record_disable(buffer);
/* Make sure all commits have finished */
- synchronize_sched();
+ synchronize_rcu();
buf->time_start = buffer_ftrace_now(buf, buf->cpu);
@@ -2250,7 +2250,7 @@ void trace_buffered_event_disable(void)
preempt_enable();
/* Wait for all current users to finish */
- synchronize_sched();
+ synchronize_rcu();
for_each_tracing_cpu(cpu) {
free_page((unsigned long)per_cpu(trace_buffered_event, cpu));
@@ -2452,7 +2452,7 @@ static inline void ftrace_exports_disable(void)
static_branch_disable(&ftrace_exports_enabled);
}
-void ftrace_exports(struct ring_buffer_event *event)
+static void ftrace_exports(struct ring_buffer_event *event)
{
struct trace_export *export;
@@ -3384,6 +3384,8 @@ static void print_func_help_header_irq(struct trace_buffer *buf, struct seq_file
const char tgid_space[] = " ";
const char space[] = " ";
+ print_event_info(buf, m);
+
seq_printf(m, "# %s _-----=> irqs-off\n",
tgid ? tgid_space : space);
seq_printf(m, "# %s / _----=> need-resched\n",
@@ -4408,13 +4410,15 @@ static int trace_set_options(struct trace_array *tr, char *option)
int neg = 0;
int ret;
size_t orig_len = strlen(option);
+ int len;
cmp = strstrip(option);
- if (strncmp(cmp, "no", 2) == 0) {
+ len = str_has_prefix(cmp, "no");
+ if (len)
neg = 1;
- cmp += 2;
- }
+
+ cmp += len;
mutex_lock(&trace_types_lock);
@@ -4604,6 +4608,10 @@ static const char readme_msg[] =
"\t\t\t traces\n"
#endif
#endif /* CONFIG_STACK_TRACER */
+#ifdef CONFIG_DYNAMIC_EVENTS
+ " dynamic_events\t\t- Add/remove/show the generic dynamic events\n"
+ "\t\t\t Write into this file to define/undefine new trace events.\n"
+#endif
#ifdef CONFIG_KPROBE_EVENTS
" kprobe_events\t\t- Add/remove/show the kernel dynamic events\n"
"\t\t\t Write into this file to define/undefine new trace events.\n"
@@ -4616,6 +4624,9 @@ static const char readme_msg[] =
"\t accepts: event-definitions (one definition per line)\n"
"\t Format: p[:[<group>/]<event>] <place> [<args>]\n"
"\t r[maxactive][:[<group>/]<event>] <place> [<args>]\n"
+#ifdef CONFIG_HIST_TRIGGERS
+ "\t s:[synthetic/]<event> <field> [<field>]\n"
+#endif
"\t -:[<group>/]<event>\n"
#ifdef CONFIG_KPROBE_EVENTS
"\t place: [<module>:]<symbol>[+<offset>]|<memaddr>\n"
@@ -4634,6 +4645,11 @@ static const char readme_msg[] =
"\t type: s8/16/32/64, u8/16/32/64, x8/16/32/64, string, symbol,\n"
"\t b<bit-width>@<bit-offset>/<container-size>,\n"
"\t <type>\\[<array-size>\\]\n"
+#ifdef CONFIG_HIST_TRIGGERS
+ "\t field: <stype> <name>;\n"
+ "\t stype: u8/u16/u32/u64, s8/s16/s32/s64, pid_t,\n"
+ "\t [unsigned] char/int/long\n"
+#endif
#endif
" events/\t\t- Directory containing all trace event subsystems:\n"
" enable\t\t- Write 0/1 to enable/disable tracing of all events\n"
@@ -5398,7 +5414,7 @@ static int tracing_set_tracer(struct trace_array *tr, const char *buf)
if (tr->current_trace->reset)
tr->current_trace->reset(tr);
- /* Current trace needs to be nop_trace before synchronize_sched */
+ /* Current trace needs to be nop_trace before synchronize_rcu */
tr->current_trace = &nop_trace;
#ifdef CONFIG_TRACER_MAX_TRACE
@@ -5412,7 +5428,7 @@ static int tracing_set_tracer(struct trace_array *tr, const char *buf)
* The update_max_tr is called from interrupts disabled
* so a synchronized_sched() is sufficient.
*/
- synchronize_sched();
+ synchronize_rcu();
free_snapshot(tr);
}
#endif
@@ -5693,7 +5709,7 @@ static int tracing_wait_pipe(struct file *filp)
mutex_unlock(&iter->mutex);
- ret = wait_on_pipe(iter, false);
+ ret = wait_on_pipe(iter, 0);
mutex_lock(&iter->mutex);
@@ -6751,7 +6767,7 @@ tracing_buffers_read(struct file *filp, char __user *ubuf,
if ((filp->f_flags & O_NONBLOCK))
return -EAGAIN;
- ret = wait_on_pipe(iter, false);
+ ret = wait_on_pipe(iter, 0);
if (ret)
return ret;
@@ -6948,7 +6964,7 @@ tracing_buffers_splice_read(struct file *file, loff_t *ppos,
if ((file->f_flags & O_NONBLOCK) || (flags & SPLICE_F_NONBLOCK))
goto out;
- ret = wait_on_pipe(iter, true);
+ ret = wait_on_pipe(iter, iter->tr->buffer_percent);
if (ret)
goto out;
@@ -7662,6 +7678,53 @@ static const struct file_operations rb_simple_fops = {
.llseek = default_llseek,
};
+static ssize_t
+buffer_percent_read(struct file *filp, char __user *ubuf,
+ size_t cnt, loff_t *ppos)
+{
+ struct trace_array *tr = filp->private_data;
+ char buf[64];
+ int r;
+
+ r = tr->buffer_percent;
+ r = sprintf(buf, "%d\n", r);
+
+ return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
+}
+
+static ssize_t
+buffer_percent_write(struct file *filp, const char __user *ubuf,
+ size_t cnt, loff_t *ppos)
+{
+ struct trace_array *tr = filp->private_data;
+ unsigned long val;
+ int ret;
+
+ ret = kstrtoul_from_user(ubuf, cnt, 10, &val);
+ if (ret)
+ return ret;
+
+ if (val > 100)
+ return -EINVAL;
+
+ if (!val)
+ val = 1;
+
+ tr->buffer_percent = val;
+
+ (*ppos)++;
+
+ return cnt;
+}
+
+static const struct file_operations buffer_percent_fops = {
+ .open = tracing_open_generic_tr,
+ .read = buffer_percent_read,
+ .write = buffer_percent_write,
+ .release = tracing_release_generic_tr,
+ .llseek = default_llseek,
+};
+
struct dentry *trace_instance_dir;
static void
@@ -7970,6 +8033,11 @@ init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer)
trace_create_file("timestamp_mode", 0444, d_tracer, tr,
&trace_time_stamp_mode_fops);
+ tr->buffer_percent = 50;
+
+ trace_create_file("buffer_percent", 0444, d_tracer,
+ tr, &buffer_percent_fops);
+
create_trace_options_dir(tr);
#if defined(CONFIG_TRACER_MAX_TRACE) || defined(CONFIG_HWLAT_TRACER)
generated by cgit v1.2.3 (git 2.39.1) at 2025-04-27 06:48:00 +0000