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authorJason Baron <jbaron@redhat.com>2009-02-26 10:11:05 -0500
committerIngo Molnar <mingo@elte.hu>2009-02-26 12:43:50 -0500
commitaf39241b90a345556b8884adff87096afe71b050 (patch)
treea913e3f15b1fb91555b5cb5899270274ce4c2c46 /kernel/irq/handle.c
parent8656e7a2fa6afcd8682990f804a2a9674568738f (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>
Diffstat (limited to 'kernel/irq/handle.c')
-rw-r--r--kernel/irq/handle.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/irq/handle.c b/kernel/irq/handle.c
index 3aba8d12f328..4709a7c870d7 100644
--- a/kernel/irq/handle.c
+++ b/kernel/irq/handle.c
@@ -17,6 +17,7 @@
17#include <linux/kernel_stat.h> 17#include <linux/kernel_stat.h>
18#include <linux/rculist.h> 18#include <linux/rculist.h>
19#include <linux/hash.h> 19#include <linux/hash.h>
20#include <trace/irq.h>
20 21
21#include "internals.h" 22#include "internals.h"
22 23
@@ -316,6 +317,9 @@ irqreturn_t no_action(int cpl, void *dev_id)
316 return IRQ_NONE; 317 return IRQ_NONE;
317} 318}
318 319
320DEFINE_TRACE(irq_handler_entry);
321DEFINE_TRACE(irq_handler_exit);
322
319/** 323/**
320 * handle_IRQ_event - irq action chain handler 324 * handle_IRQ_event - irq action chain handler
321 * @irq: the interrupt number 325 * @irq: the interrupt number
@@ -332,7 +336,9 @@ irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action)
332 local_irq_enable_in_hardirq(); 336 local_irq_enable_in_hardirq();
333 337
334 do { 338 do {
339 trace_irq_handler_entry(irq, action);
335 ret = action->handler(irq, action->dev_id); 340 ret = action->handler(irq, action->dev_id);
341 trace_irq_handler_exit(irq, action, ret);
336 if (ret == IRQ_HANDLED) 342 if (ret == IRQ_HANDLED)
337 status |= action->flags; 343 status |= action->flags;
338 retval |= ret; 344 retval |= ret;