linux-kernel - Re: [RFC 00/26] perf: Add mmap3 support

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Message-ID: <20200914151310.GA160517@kernel.org>
Date:   Mon, 14 Sep 2020 12:13:10 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Jiri Olsa <jolsa@...nel.org>, Alexei Starovoitov <ast@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Michael Petlan <mpetlan@...hat.com>,
        Song Liu <songliubraving@...com>,
        "Frank Ch. Eigler" <fche@...hat.com>,
        Ian Rogers <irogers@...gle.com>,
        Stephane Eranian <eranian@...gle.com>,
        Alexey Budankov <alexey.budankov@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [RFC 00/26] perf: Add mmap3 support

Em Mon, Sep 14, 2020 at 02:25:25PM +0900, Namhyung Kim escreveu:
> On Mon, Sep 14, 2020 at 6:03 AM Jiri Olsa <jolsa@...nel.org> wrote:
> > while playing with perf daemon support I realized I need
> > the build id data in mmap events, so we don't need to care
> > about removed/updated binaries during long perf runs.

> > This RFC patchset adds new mmap3 events that copies mmap2
> > event and adds build id in it. It makes mmap3 the default
> > mmap event for synthesizing kernel/modules/tasks and adds
> > some tooling enhancements to enable the workflow below.

> Cool! It's nice that we can skip the final build-id collection stage
> with this while data size will be bigger.

Yeah, this is something long overdue, comes with extra cost for people
not wanting build-ids, but then they can just use MMAP2 or even MMAP if
that is enough.

More comments on the other patches.

- Arnaldo