Re: [PATCH 1/3 v2] perf_event: fix race inperf_swevent_get_recursion_context()

From: Peter Zijlstra
Date: Tue Jan 19 2010 - 03:46:57 EST

On Tue, 2010-01-19 at 16:37 +0800, Xiao Guangrong wrote:
> It only disable preemption in perf_swevent_get_recursion_context(),
> it can't avoid race of hard-irq and NMI since they are nested that
> will re-enter this path and make the recursion value chaotic
> In this patch, we use atomic operation to avoid it and reduce
> cpu_ctx->recursion size, it also make this patch no need disable
> preemption


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