linux-kernel - RE: [RFC PATCH v16 8/8] perf test: Add test for Intel TPEBS counting mode

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Message-ID: <CO6PR11MB563567A7804F50AD5AA1F708EEDB2@CO6PR11MB5635.namprd11.prod.outlook.com>
Date: Tue, 9 Jul 2024 04:58:42 +0000
From: "Wang, Weilin" <weilin.wang@...el.com>
To: Namhyung Kim <namhyung@...nel.org>
CC: Ian Rogers <irogers@...gle.com>, Arnaldo Carvalho de Melo
	<acme@...nel.org>, Peter Zijlstra <peterz@...radead.org>, Ingo Molnar
	<mingo@...hat.com>, Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>, "Hunter, Adrian" <adrian.hunter@...el.com>,
	"Kan Liang" <kan.liang@...ux.intel.com>, "linux-perf-users@...r.kernel.org"
	<linux-perf-users@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "Taylor, Perry" <perry.taylor@...el.com>,
	"Alt, Samantha" <samantha.alt@...el.com>, "Biggers, Caleb"
	<caleb.biggers@...el.com>
Subject: RE: [RFC PATCH v16 8/8] perf test: Add test for Intel TPEBS counting
 mode



> -----Original Message-----
> From: Namhyung Kim <namhyung@...nel.org>
> Sent: Monday, July 8, 2024 9:44 PM
> To: Wang, Weilin <weilin.wang@...el.com>
> Cc: Ian Rogers <irogers@...gle.com>; Arnaldo Carvalho de Melo
> <acme@...nel.org>; Peter Zijlstra <peterz@...radead.org>; Ingo Molnar
> <mingo@...hat.com>; Alexander Shishkin
> <alexander.shishkin@...ux.intel.com>; Jiri Olsa <jolsa@...nel.org>; Hunter,
> Adrian <adrian.hunter@...el.com>; Kan Liang <kan.liang@...ux.intel.com>;
> linux-perf-users@...r.kernel.org; linux-kernel@...r.kernel.org; Taylor, Perry
> <perry.taylor@...el.com>; Alt, Samantha <samantha.alt@...el.com>; Biggers,
> Caleb <caleb.biggers@...el.com>
> Subject: Re: [RFC PATCH v16 8/8] perf test: Add test for Intel TPEBS counting
> mode
> 
> Hello Weilin,
> 
> On Sat, Jul 6, 2024 at 4:30 PM <weilin.wang@...el.com> wrote:
> >
> > From: Weilin Wang <weilin.wang@...el.com>
> >
> > Intel TPEBS sampling mode is supported through perf record. The counting
> mode
> > code uses perf record to capture retire_latency value and use it in metric
> > calculation. This test checks the counting mode code.
> >
> > Signed-off-by: Weilin Wang <weilin.wang@...el.com>
> > ---
> >  .../perf/tests/shell/test_stat_intel_tpebs.sh  | 18 ++++++++++++++++++
> >  1 file changed, 18 insertions(+)
> >  create mode 100755 tools/perf/tests/shell/test_stat_intel_tpebs.sh
> >
> > diff --git a/tools/perf/tests/shell/test_stat_intel_tpebs.sh
> b/tools/perf/tests/shell/test_stat_intel_tpebs.sh
> > new file mode 100755
> > index 000000000000..fea8cb1b8367
> > --- /dev/null
> > +++ b/tools/perf/tests/shell/test_stat_intel_tpebs.sh
> > @@ -0,0 +1,18 @@
> > +#!/bin/bash
> > +# test Intel TPEBS counting mode
> > +# SPDX-License-Identifier: GPL-2.0
> > +
> > +set -e
> > +
> > +# Use this event for testing because it should exist in all platforms
> > +event=cache-misses:R
> > +
> > +# Without this cmd option, default value or zero is returned
> > +echo "Testing without --record-tpebs"
> > +result=$(perf stat -e "$event" true 2>&1)
> > +[[ "$result" =~ $event ]] || exit 1
> > +
> > +# In platforms that do not support TPEBS, it should execute without error.
> > +echo "Testing with --record-tpebs"
> > +result=$(perf stat -e "$event" --record-tpebs -a sleep 0.01 2>&1)
> 
> It never finishes on my AMD machine.
> 
Hi Namhyung,

Do you see any message while it executes? Is the perf record forked successfully
but failed to return?

Thanks,
Weilin

> Thanks,
> Namhyung
> 
> 
> > +[[ "$result" =~ "perf record" && "$result" =~ $event ]] || exit 1
> > --
> > 2.43.0
> >