]> git.baikalelectronics.ru Git - kernel.git/commit
perf_counter: uncouple data_head updates from wakeups
authorPeter Zijlstra <a.p.zijlstra@chello.nl>
Tue, 5 May 2009 15:50:22 +0000 (17:50 +0200)
committerIngo Molnar <mingo@elte.hu>
Tue, 5 May 2009 18:18:30 +0000 (20:18 +0200)
commit45db363f2b57ee4e871ca3bf17486979d09813be
treec671172166d94be75ad9d6df1fdafa0c006c4609
parent33467cf3fd3de1a7f51a9f572f4f9fea9209b31f
perf_counter: uncouple data_head updates from wakeups

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>
include/linux/perf_counter.h
kernel/perf_counter.c