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perf_counter: Log irq_period changes

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For the dynamic irq_period code, log whenever we change the period so that
analyzing code can normalize the event flow.

[ Impact: add new feature to allow more precise profiling ]

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: John Kacur <jkacur@redhat.com>
LKML-Reference: <20090520102553.298769743@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra
2009-05-20 12:21:20 +02:00
committed by Ingo Molnar
parent d7b629a34f
commit 26b119bc81
2 changed files with 47 additions and 1 deletions
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8
include/linux/perf_counter.h
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@@ -257,6 +257,14 @@ enum perf_event_type {
*/
PERF_EVENT_COMM = 3,
/*
* struct {
* struct perf_event_header header;
* u64 irq_period;
* };
*/
PERF_EVENT_PERIOD = 4,
/*
* When header.misc & PERF_EVENT_MISC_OVERFLOW the event_type field
* will be PERF_RECORD_*