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

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Message-ID: <20210315153359.s47atiznpxkrc7oq@two.firstfloor.org>
Date:   Mon, 15 Mar 2021 08:34:00 -0700
From:   Andi Kleen <andi@...stfloor.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Song Liu <songliubraving@...com>, Andi Kleen <andi@...stfloor.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

> 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.


-Andi