linux-kernel - Re: [PATCH] perf record: Cache build-ID of hit DSOs only

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Message-Id: <175406907739.1475083.17263250122048351650.b4-ty@kernel.org>
Date: Fri, 01 Aug 2025 10:24:37 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Arnaldo Carvalho de Melo <acme@...nel.org>, 
 Ian Rogers <irogers@...gle.com>, Kan Liang <kan.liang@...ux.intel.com>, 
 Namhyung Kim <namhyung@...nel.org>
Cc: Jiri Olsa <jolsa@...nel.org>, Adrian Hunter <adrian.hunter@...el.com>, 
 Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...nel.org>, 
 LKML <linux-kernel@...r.kernel.org>, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH] perf record: Cache build-ID of hit DSOs only

On Thu, 31 Jul 2025 00:03:30 -0700, Namhyung Kim wrote:
> It post-processes samples to find which DSO has samples.  Based on that
> info, it can save used DSOs in the build-ID cache directory.  But for
> some reason, it saves all DSOs without checking the hit mark.  Skipping
> unused DSOs can give some speedup especially with --buildid-mmap being
> default.
> 
> On my idle machine, `time perf record -a sleep 1` goes down from 3 sec
> to 1.5 sec with this change.
> 
> [...]
Applied to perf-tools-next, thanks!

Best regards,
Namhyung