linux-kernel - Re: [PATCH] perf tests: Don't retest sections in "Object code reading"

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Message-ID: <aOQgiN0IlSso_L6d@x1>
Date: Mon, 6 Oct 2025 17:03:20 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: James Clark <james.clark@...aro.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>, Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>, Leo Yan <leo.yan@....com>,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf tests: Don't retest sections in "Object code
 reading"

On Mon, Oct 06, 2025 at 08:21:12AM -0700, Ian Rogers wrote:
> On Mon, Oct 6, 2025 at 6:11 AM James Clark <james.clark@...aro.org> wrote:
> > We already only test each kcore map once, but on slow systems
> > (particularly with network filesystems) even the non-kcore maps are
> > slow. The test can test the same objump output over and over which only
> > wastes time. Generalize the skipping mechanism to track all DSOs and
> > addresses so that each section is only tested once.
> >
> > On a fully loaded Arm Juno (simulating a parallel Perf test run) with a
> > network filesystem, the original runtime is:
> >
> >   real  1m51.126s
> >   user  0m19.445s
> >   sys   1m15.431s
> >
> > And the new runtime is:
> >
> >   real  0m48.873s
> >   user  0m8.031s
> >   sys   0m32.353s
> >
> > Signed-off-by: James Clark <james.clark@...aro.org>
> 
> Reviewed-by: Ian Rogers <irogers@...gle.com>

Thanks, applied to perf-tools-next,

- Arnaldo