linux-kernel - Re: [PATCH V2 2/6] perf/x86/intel/pebs: Fix PEBS timestamps overwritten

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Message-ID: <CAM9d7chpXGm9vDf4qN0JQQWdgWDNR05vPuqnDo4=F2jWdo0S3A@mail.gmail.com>
Date:   Wed, 12 Oct 2022 09:12:32 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Peter Zijlstra <peterz@...radead.org>,
        Kan Liang <kan.liang@...ux.intel.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Stephane Eranian <eranian@...gle.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>, andreas.kogler.0x@...il.com,
        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
        Ravi Bangoria <ravi.bangoria@....com>
Subject: Re: [PATCH V2 2/6] perf/x86/intel/pebs: Fix PEBS timestamps overwritten

Hi Peter,

On Wed, Oct 12, 2022 at 1:05 AM Peter Zijlstra <peterz@...radead.org> wrote:
>
> On Tue, Oct 11, 2022 at 11:20:54AM -0700, Namhyung Kim wrote:
>
> > One thing I noticed is that the system has a config option
> > CONFIG_HAVE_UNSTABLE_SCHED_CLOCK=y.
>
> You can't build x86 without that.

Oh, I didn't know that..  so it's not a config problem.

Kan, could you check the following command?

  $ perf record -e cycles:upp dd if=/dev/zero of=/dev/null count=10000

Thanks,
Namhyung