linux-kernel - Re: [PATCH v1] perf test annotate: Use --percent-limit rather than head to reduce output

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Message-Id: <175139251517.738306.4966360457421812263.b4-ty@kernel.org>
Date: Tue, 01 Jul 2025 10:55:15 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
 Arnaldo Carvalho de Melo <acme@...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>, 
 Kan Liang <kan.liang@...ux.intel.com>, James Clark <james.clark@...aro.org>, 
 Thomas Richter <tmricht@...ux.ibm.com>, linux-perf-users@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Ian Rogers <irogers@...gle.com>
Subject: Re: [PATCH v1] perf test annotate: Use --percent-limit rather than
 head to reduce output

On Fri, 27 Jun 2025 18:58:32 -0700, Ian Rogers wrote:
> The annotate test was sped up by Thomas Richter
> <tmricht@...ux.ibm.com> in commit
> 658a8805cb60 ("perf test: Speed up test case 70 annotate basic tests")
> by reducing the annotate output using head. This causes flakes on
> hybrid machines where the first event dumped may not have the samples
> for the test within it. Rather than reduce the output using `head`
> switch to `--percent-limit 10` which will stop annotate dumping
> functions that have an overhead of less than 10%, the noploop program
> should be using more.
> 
> [...]
Applied to perf-tools-next, thanks!

Best regards,
Namhyung