perf_event: Allocate children's perf_event_ctxp at the right time

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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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Xiao Guangrong 2009-12-09 11:29:44 +08:00 • committed by Ingo Molnar

parent aa5452d70c

commit b93f7978ad

1 changed files with 22 additions and 15 deletions

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kernel/perf_event.c

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