From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Tue, 5 May 2009 15:50:22 +0000 (+0200)
Subject: perf_counter: uncouple data_head updates from wakeups
X-Git-Tag: v2.6.31-rc1~383^2~301
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c66de4a5be7913247bd83d79168f8e4420c9cfbc;p=pandora-kernel.git

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>
---

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