perf: Optimize event scheduling locking

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Currently we only hold one ctx->lock at a time, which results in us
flipping back and forth between cpuctx->ctx.lock and task_ctx->lock.

Avoid this and gain large atomic regions by holding both locks. We
nest the task lock inside the cpu lock, since with task scheduling we
might have to change task ctx while holding the cpu ctx lock.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20110409192141.769881865@chello.nl
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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Peter Zijlstra 2011-04-09 21:17:42 +02:00 • committed by Ingo Molnar

parent 9137fb28ac

commit facc43071c

1 changed files with 36 additions and 25 deletions

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kernel/events/core.c

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