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

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Date:   Sun, 19 Dec 2021 14:04:45 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     "Frank Ch. Eigler" <fche@...hat.com>
Cc:     Namhyung Kim <namhyung@...nel.org>,
        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>
Subject: Re: [RFC] perf record: Disable debuginfod by default

On Fri, Dec 10, 2021 at 11:50:10AM -0500, Frank Ch. Eigler wrote:
> Hi -
> 
> On Fri, Dec 10, 2021 at 01:23:32PM +0100, Jiri Olsa wrote:
> > [...]
> > at the end of the perf record we populate buildid cache
> > with profiled binaries for the current perf.data
> > 
> > **IF** there's DEBUGINFOD_URLS defined, that code will
> > also ask debuginfod for binaries it could not find on
> > the system
> 
> Consider doing this only at the end of the run, and in the background,
> just as a prefetch for the perf report step?  The main downside there
> could be if one runs many perf record jobs in close proximity,
> overlapping larger prefetch download tasks.  That might waste some
> network traffic.

right, IMO it's too much for default behaviour but I think could
do this under new (config) option, if there's a need for that

thanks,
jirka