linux-kernel - Re: [PATCH] perf-stat: introduce bperf, share hardware PMCs with BPF

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Date:   Mon, 15 Mar 2021 18:29:03 +0000
From:   Song Liu <songliubraving@...com>
To:     Andi Kleen <andi@...stfloor.org>
CC:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Kernel Team <Kernel-team@...com>,
        "namhyung@...nel.org" <namhyung@...nel.org>,
        "linux-perf-users@...stprotocols.net" 
        <linux-perf-users@...stprotocols.net>
Subject: Re: [PATCH] perf-stat: introduce bperf, share hardware PMCs with BPF



> On Mar 15, 2021, at 8:34 AM, Andi Kleen <andi@...stfloor.org> wrote:
> 
>> I still think that there is value in taking those measurements after we
>> enable the counters, as, for instance, for interval mode we want
>> measurements with the counters enabled, whatever happens before the
>> counters are enabled is just startup time, etc. Jiri, Andi?
> 
> Yes I agree. Only the time with counters enabled matters.

I see. This change itself is a valid fix. I will create a separate patch.

Thanks,
Song