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Date: Thu, 21 May 2015 06:27:17 -0700
Message-ID: <CABPqkBTvAd3RAp2AuM6DUMk4-dKs6cAXOt-Ewfw58DodmTtU4Q@mail.gmail.com>
Subject: Re: [PATCH 01/10] perf,x86: Fix event/group validation
From: Stephane Eranian <eranian@google.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>, Vince Weaver <vincent.weaver@maine.edu>,
        Jiri Olsa <jolsa@redhat.com>, "Liang, Kan" <kan.liang@intel.com>,
        LKML <linux-kernel@vger.kernel.org>, Andrew Hunter <ahh@google.com>,
        Maria Dimakopoulou <maria.n.dimakopoulou@gmail.com>
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On Thu, May 21, 2015 at 6:20 AM, Peter Zijlstra <peterz@infradead.org> wrote:
> 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.

You mean x86_schedule_events() calls x86_schedule_events()?
Or are you talking about a preemption while executing x86_schedule_events()?
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