From: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Date: Wed, 9 Dec 2009 03:29:44 +0000 (+0800)
Subject: perf_event: Allocate children's perf_event_ctxp at the right time
X-Git-Tag: v2.6.33-rc1~306^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b93f7978ad6b46133e9453b90ccc057dc2429e75;p=pandora-kernel.git

perf_event: Allocate children's perf_event_ctxp at the right time

In current code, children task will allocate memory for
'child->perf_event_ctxp' if the parent is counted, we can
do it only if the parent allowed children inherit it.

It can save memory and reduce overhead.

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Reviewed-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <4B1F19A8.5040805@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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