diff options
| author | Jason Baron <jbaron@redhat.com> | 2009-02-26 10:11:05 -0500 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-02-26 18:43:50 +0100 |
| commit | af39241b90a345556b8884adff87096afe71b050 (patch) | |
| tree | a913e3f15b1fb91555b5cb5899270274ce4c2c46 | |
| parent | 8656e7a2fa6afcd8682990f804a2a9674568738f (diff) | |
tracing, genirq: add irq enter and exit trace events
Impact: add new tracepoints
Add them to the generic IRQ code, that way every architecture
gets these new tracepoints, not just x86.
Using Steve's new 'TRACE_FORMAT', I can get function graph
trace as follows using the original two IRQ tracepoints:
3) | handle_IRQ_event() {
3) | /* (irq_handler_entry) irq=28 handler=eth0 */
3) | e1000_intr_msi() {
3) 2.460 us | __napi_schedule();
3) 9.416 us | }
3) | /* (irq_handler_exit) irq=28 handler=eth0 return=handled */
3) + 22.935 us | }
Signed-off-by: Jason Baron <jbaron@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Mathieu Desnoyers <compudj@krystal.dyndns.org>
Cc: "Frank Ch. Eigler" <fche@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | include/trace/irq.h | 9 | ||||
| -rw-r--r-- | include/trace/irq_event_types.h | 17 | ||||
| -rw-r--r-- | kernel/irq/handle.c | 6 | ||||
| -rw-r--r-- | kernel/trace/events.c | 2 |
4 files changed, 34 insertions, 0 deletions
diff --git a/include/trace/irq.h b/include/trace/irq.h new file mode 100644 index 00000000000..ff5d4495dc3 --- /dev/null +++ b/include/trace/irq.h @@ -0,0 +1,9 @@ +#ifndef _TRACE_IRQ_H +#define _TRACE_IRQ_H + +#include <linux/interrupt.h> +#include <linux/tracepoint.h> + +#include <trace/irq_event_types.h> + +#endif diff --git a/include/trace/irq_event_types.h b/include/trace/irq_event_types.h new file mode 100644 index 00000000000..5d0919fdd2d --- /dev/null +++ b/include/trace/irq_event_types.h @@ -0,0 +1,17 @@ + +/* use <trace/irq.h> instead */ +#ifndef TRACE_FORMAT +# error Do not include this file directly. +# error Unless you know what you are doing. +#endif + +TRACE_FORMAT(irq_handler_entry, + TPPROTO(int irq, struct irqaction *action), + TPARGS(irq, action), + TPFMT("irq=%d handler=%s", irq, action->name)); + +TRACE_FORMAT(irq_handler_exit, + TPPROTO(int irq, struct irqaction *action, int ret), + TPARGS(irq, action, ret), + TPFMT("irq=%d handler=%s return=%s", + irq, action->name, ret ? "handled" : "unhandled")); diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c index 3aba8d12f32..4709a7c870d 100644 --- a/kernel/irq/handle.c +++ b/kernel/irq/handle.c @@ -17,6 +17,7 @@ #include <linux/kernel_stat.h> #include <linux/rculist.h> #include <linux/hash.h> +#include <trace/irq.h> #include "internals.h" @@ -316,6 +317,9 @@ irqreturn_t no_action(int cpl, void *dev_id) return IRQ_NONE; } +DEFINE_TRACE(irq_handler_entry); +DEFINE_TRACE(irq_handler_exit); + /** * handle_IRQ_event - irq action chain handler * @irq: the interrupt number @@ -332,7 +336,9 @@ irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action) local_irq_enable_in_hardirq(); do { + trace_irq_handler_entry(irq, action); ret = action->handler(irq, action->dev_id); + trace_irq_handler_exit(irq, action, ret); if (ret == IRQ_HANDLED) status |= action->flags; retval |= ret; diff --git a/kernel/trace/events.c b/kernel/trace/events.c index 38c89eef99e..3c75623893c 100644 --- a/kernel/trace/events.c +++ b/kernel/trace/events.c @@ -6,8 +6,10 @@ /* trace/<type>.h here */ #include <trace/sched.h> +#include <trace/irq.h> #include "trace_events.h" /* trace/<type>_event_types.h here */ #include <trace/sched_event_types.h> +#include <trace/irq_event_types.h> |