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>

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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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1

include/linux/perf_counter.h

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8

kernel/perf_counter.c

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