linux-kernel - Re: [PATCH 0/5] perf: add support for capturing skid IP

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Message-ID: <CABPqkBTuyDByke_uN_qOZhvdv5vLKtfFK5qxyFU9-mV=nakcRQ@mail.gmail.com>
Date:   Fri, 16 Jun 2017 12:15:14 -0700
From:   Stephane Eranian <eranian@...gle.com>
To:     Andi Kleen <ak@...ux.intel.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "mingo@...e.hu" <mingo@...e.hu>,
        "Liang, Kan" <kan.liang@...el.com>, Jiri Olsa <jolsa@...hat.com>
Subject: Re: [PATCH 0/5] perf: add support for capturing skid IP

On Fri, Jun 16, 2017 at 10:50 AM, Andi Kleen <ak@...ux.intel.com> wrote:
>> > Yeah, I think it is easier and more portable, especially on hardware with a
>> > PEBS-like mechanism but no branch buffer (like LBR). FYI, I did do a test
>> > implementation yesterday to evaluate the difficulty.
>> >
>> A more generalized usage of the feature is to evaluate the amount of skid
>> for any precise event.
>
> It should be always the same (one instruction), except for the control flow
> change case.
>
That's on Intel X86. What about the other arch?

> -Andi