linux-kernel - Re: [GIT PULL] perf tools changes for v5.19: 2nd batch

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Message-ID: <CAHk-=wj1+W6VXeRG7XXO7zSsTe3mACdrPY4PccMNPhC3seLELg@mail.gmail.com>
Date:   Sun, 29 May 2022 10:28:26 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Clark Williams <williams@...hat.com>,
        Kate Carcia <kcarcia@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-perf-users@...r.kernel.org,
        Adrian Hunter <adrian.hunter@...el.com>,
        Carsten Haitzler <carsten.haitzler@....com>,
        Claire Jensen <cjense@...gle.com>,
        Dmitriy Vyukov <dvyukov@...gle.com>,
        Eelco Chaudron <echaudro@...hat.com>,
        Eric Lin <eric.lin@...ive.com>,
        Florian Fischer <florian.fischer@...q.space>,
        German Gomez <german.gomez@....com>,
        Ian Rogers <irogers@...gle.com>,
        James Clark <james.clark@....com>,
        Joe Mario <jmario@...hat.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Leo Yan <leo.yan@...aro.org>,
        Martin Liška <mliska@...e.cz>,
        Thomas Richter <tmricht@...ux.ibm.com>,
        Xing Zhengjun <zhengjun.xing@...ux.intel.com>,
        Yang Jihong <yangjihong1@...wei.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [GIT PULL] perf tools changes for v5.19: 2nd batch

On Sun, May 29, 2022 at 8:45 AM Arnaldo Carvalho de Melo
<acme@...nel.org> wrote:
>
> - Add BPF based off-CPU profiling.

I suspect this could have come with a bit more explanation of what
"off-CPU profiling" means.

It seems to be "account time when process was scheduled away to
caller", but I had to go look at the commits to figure that out.

Partly unrelated side note: I've occasionally looked for "useful perf
recipes". Not from kernel developers, but from people who solved real
performance problems using perf, giving useful examples.

                  Linus