linux-kernel - Re: [PATCH v4 4/4] perf test amd ibs: Add sample period unit test

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Message-ID: <aBIgVi90Zinz6Rl4@x1>
Date: Wed, 30 Apr 2025 10:06:30 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Ravi Bangoria <ravi.bangoria@....com>
Cc: Ingo Molnar <mingo@...hat.com>, Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Joe Mario <jmario@...hat.com>,
	Stephane Eranian <eranian@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Kan Liang <kan.liang@...ux.intel.com>, linux-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org,
	Santosh Shukla <santosh.shukla@....com>,
	Ananth Narayan <ananth.narayan@....com>,
	Sandipan Das <sandipan.das@....com>
Subject: Re: [PATCH v4 4/4] perf test amd ibs: Add sample period unit test

On Wed, Apr 30, 2025 at 02:32:12PM +0530, Ravi Bangoria wrote:
> On 30-Apr-25 6:52 AM, Arnaldo Carvalho de Melo wrote:
> > On Tue, Apr 29, 2025 at 10:13:53PM -0300, Arnaldo Carvalho de Melo wrote:
> >> Adding the patch below cures it, still need to test on a Zen 5 system.

> >> These issues were just in the regression test.
 
> > BTW, all is at the tmp.perf-tools-next branch at:
 
> > https://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools-next.git

> I tested with few simple perf mem/c2c commands and it seems to be working
> fine.

Thanks for checking!

While testing it I noticed that locally built kernels using O= to
separate the build files from source are ending up with:

root@...ber:/home/acme/git/linux# readelf -wi ../build/v6.15.0-rc4+/vmlinux | grep -m1 DW_AT_comp_dir
    <17>   DW_AT_comp_dir    : (indirect line string, offset: 0): /home/acme/git/build/v6.15.0-rc4+
root@...ber:/home/acme/git/linux# readelf -wi ../build/v6.15.0-rc4+/vmlinux | grep DW_AT_comp_dir | cut -d: -f4 | sort | uniq -c
     49  /home/acme/git/build/v6.15.0-rc2+
   3104  /home/acme/git/build/v6.15.0-rc4+
root@...ber:/home/acme/git/linux#

I reused a previous build dir, something got reused, but then tools like
annotate, objdump -dS can't find the sources.

A distraction while testing your patches :-\

- Arnaldo