linux-kernel - Re: [PATCH 01/10] perf,x86: Fix event/group validation

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Message-ID: <20150521132015.GS3644@twins.programming.kicks-ass.net>
Date:	Thu, 21 May 2015 15:20:15 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Vince Weaver <vincent.weaver@...ne.edu>,
	Jiri Olsa <jolsa@...hat.com>,
	"Liang, Kan" <kan.liang@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Andrew Hunter <ahh@...gle.com>,
	Maria Dimakopoulou <maria.n.dimakopoulou@...il.com>
Subject: Re: [PATCH 01/10] perf,x86: Fix event/group validation

On Thu, May 21, 2015 at 06:18:15AM -0700, Stephane Eranian wrote:
> Yes, it does modify the cpuc->event_list[]->hwc, because it is used as a
> cache for *EACH* invocation of the function. It is irrelevant outside the
> function.

Yes, but the problem is that they _nest_.

So you get to use the one from the nested call in the outer call.
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