perf_counter: uncouple data_head updates from wakeups

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Keep data_head up-to-date irrespective of notifications. This fixes
the case where you disable a counter and don't get a notification for
the last few pending events, and it also allows polling usage.

[ Impact: increase precision of perfcounter mmap-ed fields ]

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: <20090505155436.925084300@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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This commit is contained in:

Peter Zijlstra 2009-05-05 17:50:22 +02:00 • committed by Ingo Molnar

parent 066d7dea32

commit c66de4a5be

2 changed files with 12 additions and 12 deletions

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4

include/linux/perf_counter.h

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20

kernel/perf_counter.c

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