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perf_counter: add ioctl(PERF_COUNTER_IOC_RESET)

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Provide a way to reset an existing counter - this eases PAPI
libraries around perfcounters.

Similar to read() it doesn't collapse pending child counters.

[ Impact: new perfcounter fd ioctl method to reset counters ]

Suggested-by: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <20090505155437.022272933@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra
2009-05-05 17:50:23 +02:00
committed by Ingo Molnar
parent c66de4a5be
commit 6de6a7b957
2 changed files with 9 additions and 0 deletions
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include/linux/perf_counter.h
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@@ -160,6 +160,7 @@ struct perf_counter_hw_event {
#define PERF_COUNTER_IOC_ENABLE _IO ('$', 0)
#define PERF_COUNTER_IOC_DISABLE _IO ('$', 1)
#define PERF_COUNTER_IOC_REFRESH _IOW('$', 2, u32)
#define PERF_COUNTER_IOC_RESET _IO ('$', 3)
/*
* Structure of the page that can be mapped via mmap