linux-kernel - Re: [PATCH v3 1/2] perf symbol: Correct address for bss symbols

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Message-ID: <20220726005307.GA36862@leoy-ThinkPad-X240s>
Date:   Tue, 26 Jul 2022 08:53:07 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>,
        Fangrui Song <maskray@...gle.com>,
        Chang Rui <changruinj@...il.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] perf symbol: Correct address for bss symbols

Hi Arnaldo,

On Mon, Jul 25, 2022 at 03:29:45PM -0300, Arnaldo Carvalho de Melo wrote:

[...]

> > First we used 'perf mem record' to run the test program and then used
> > 'perf --debug verbose=4 mem report' to observe what's the symbol info
> > for 'buf1' and 'buf2' structures.
> > 
> >   # ./perf mem record -e ldlat-loads,ldlat-stores -- false_sharing.exe 8
> 
> Can you share the source code for your false sharing proggie? We need to
> have something in 'perf test' exercising these routines :-)

Sure, I am using the false sharing test case:
https://github.com/joemario/perf-c2c-usage-files/blob/master/false_sharing_example.c

... with build command:

$ gcc -g false_sharing_example.c -pthread -lnuma -o false_sharing.exe

Do want me to proceed for adding test case?  Otherwise, it's fine if
you will work on the enabling test case :)

Thanks,
Leo