linux-kernel - Re: [PATCH v2 1/1] perf test arm64: Test unwinding using fame-pointer (fp) mode

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Date:   Tue, 22 Mar 2022 13:27:52 +0000
From:   German Gomez <german.gomez@....com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     James Clark <james.clark@....com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org, mark.rutland@....com,
        namhyung@...nel.org, leo.yan@...aro.org, Alexandre.Truong@....com,
        Jiri Olsa <jolsa@...nel.org>
Subject: Re: [PATCH v2 1/1] perf test arm64: Test unwinding using fame-pointer
 (fp) mode


On 21/03/2022 20:52, Arnaldo Carvalho de Melo wrote:
> Em Wed, Mar 16, 2022 at 05:48:50PM +0000, German Gomez escreveu:
>> On 16/03/2022 17:30, James Clark wrote:
>>> On 16/03/2022 17:20, German Gomez wrote:
>>>> Add a shell script to check that the call-graphs generated using frame
>>>> pointers (--call-graph fp) are complete and not missing leaf functions:
>>>>
>>>>   | $ perf test 88 -v
>>>>   |  88: Check Arm64 callgraphs are complete in fp mode                  :
>>>>   | --- start ---
>>>>   | test child forked, pid 8734
>>>>   |  + Compiling test program (/tmp/test_program.Cz3yL)...
>>>>   |  + Recording (PID=8749)...
>>>>   |  + Stopping perf-record...
>>>>   | test_program.Cz
>>>>   |                  728 leaf
>>>>   |                  753 parent
>>>>   |                  76c main
>>>>   | test child finished with 0
>>>>   | ---- end ----
>>>>   | Check Arm SPE callgraphs are complete in fp mode: Ok
>>>>
>>> Ran it on N1SDP and it passes, and it fails if b9f6fbb3b2c2 isn't applied.
>> I forgot to mention in the notes that it's supposed to work with both unwinders:
>>
>> $ make                # for libunwind (default)
>> $ make NO_LIBUNWIND=1 # for libdw
> I'll add it to the cset commit log, and also will fix this:
>
> ⬢[acme@...lbox perf]$        git am ./v2_20220316_german_gomez_perf_test_arm64_test_unwinding_using_fame_pointer_fp_mode.mbx
> Applying: perf test arm64: Test unwinding using fame-pointer (fp) mode
> .git/rebase-apply/patch:72: trailing whitespace.
> # program
> warning: 1 line adds whitespace errors.
> tools/perf/tests/shell/test_arm_callgraph_fp.sh:58: trailing whitespace.
> +# program
> ⬢[acme@...lbox perf]$
>  

Thanks Arnaldo, I forgot to run the checkpatch script.

>>> Reviewed-by: James Clark <james.clark@....com>
>>>
>>>> Fixes: b9f6fbb3b2c2 ("perf arm64: Inject missing frames when using 'perf record --call-graph=fp'")
>>>> Suggested-by: Jiri Olsa <jolsa@...nel.org>
>>>> Signed-off-by: German Gomez <german.gomez@....com>