From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Fri, 8 May 2009 16:52:22 +0000 (+0200)
Subject: perf_counter: rework ioctl()s
X-Git-Tag: v2.6.31-rc1~383^2~293
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3df5edad87a998273aa5a9a8c728c05d855ad00e;p=pandora-kernel.git

perf_counter: rework ioctl()s

Corey noticed that ioctl()s on grouped counters didn't work on
the whole group. This extends the ioctl() interface to take a
second argument that is interpreted as a flags field. We then
provide PERF_IOC_FLAG_GROUP to toggle the behaviour.

Having this flag gives the greatest flexibility, allowing you
to individually enable/disable/reset counters in a group, or
all together.

[ Impact: fix group counter enable/disable semantics ]

Reported-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: <20090508170028.837558214@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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