linux-kernel - Re: [RFC] perf record: Disable debuginfod by default

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Message-ID: <CAM9d7cjyN_sxMe9yajgnuDRy5234NZQ5sd0e4ynBmCnQSv=WFQ@mail.gmail.com>
Date:   Thu, 9 Dec 2021 15:39:20 -0800
From:   Namhyung Kim <namhyung@...nel.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Arnaldo Carvalho de Melo <acme@...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>,
        Ian Rogers <irogers@...gle.com>,
        linux-perf-users <linux-perf-users@...r.kernel.org>,
        "Frank Ch. Eigler" <fche@...hat.com>
Subject: Re: [RFC] perf record: Disable debuginfod by default

Hi Jiri,

On Thu, Dec 9, 2021 at 12:04 PM Jiri Olsa <jolsa@...hat.com> wrote:
>
> hi,
> after migrating to fedora 35 I found perf record hanging on exit
> and it's because fedora 35 sets DEBUGINFOD_URLS that triggers
> debuginfod query which might take long time to process.
>
> I discussed this briefly with Frank and I'm sending the change
> to disable debuginfod by default in perf record.
>
> Frank had other idea we could discuss here to fork or just spawn
> "/usr/bin/debuginfod-find ...." into background after perf record.
>
> Perhaps there are other ways as well, hence this is RFC ;-)

I thought the debuginfod was for perf report, not record.
Maybe I'm missing something but how about moving it to
report?  We can talk to debuginfod after checking the local
build-id cache and binary on the system.

Still, we can have perf buildid-cache to move it from the
debuginfod to local cache.

Thanks,
Namhyung