linux-kernel - Re: [PATCH] perf/x86: Fix overlap counter scheduling bug

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Message-ID: <20161110164128.GZ3142@twins.programming.kicks-ass.net>
Date:   Thu, 10 Nov 2016 17:41:28 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     Robert Richter <rric@...nel.org>,
        "Liang, Kan" <kan.liang@...el.com>,
        Andi Kleen <andi@...stfloor.org>, Jiri Olsa <jolsa@...nel.org>,
        Vince Weaver <vince@...ter.net>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perf/x86: Fix overlap counter scheduling bug

On Thu, Nov 10, 2016 at 09:00:13AM +0100, Ingo Molnar wrote:
> Would it be possible to also add debug code (or some other mechanism) to disallow
> such buggy EVENT_CONSTRAINT_OVERLAP() definitions?

Should certainly be possible if someone has the time for it I think. The
rules are fairly straight forward, the only tricky bit is detectoring
the actual overlap condition.