linux-kernel - Re: [PATCH V2 01/23] perf intel-pt: Add a test for system-wide side band

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Message-ID: <aba8a38f-3d91-b925-dc26-61a48597089c@intel.com>
Date:   Tue, 10 May 2022 20:21:12 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Jiri Olsa <jolsa@...hat.com>, Ian Rogers <irogers@...gle.com>,
        Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Leo Yan <leo.yan@...aro.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 01/23] perf intel-pt: Add a test for system-wide side
 band

On 10/05/22 20:18, Arnaldo Carvalho de Melo wrote:
> Em Fri, May 06, 2022 at 03:25:39PM +0300, Adrian Hunter escreveu:
>> Add a test for system-wide side band even when tracing selected CPUs.
>>
>> Tested-by: Ian Rogers <irogers@...gle.com>
>> Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
> 
> 
> [root@...co ~]# uname -a
> Linux quaco 5.16.13-200.fc35.x86_64 #1 SMP PREEMPT Tue Mar 8 22:50:58 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
> [root@...co ~]# grep -m1 -i "model name" /proc/cpuinfo 
> model name	: Intel(R) Core(TM) i7-8650U CPU @ 1.90GHz
> [root@...co ~]# perf test -v Misc
>  97: Miscellaneous Intel PT testing                                  :
> --- start ---
> test child forked, pid 769475
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 1.352 MB /tmp/tmp.Ty4Rqnz4vz ]
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 1.352 MB /tmp/tmp.Ty4Rqnz4vz ]
> Linux
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 1.446 MB /tmp/tmp.TnEqenwzZv ]
> Failed to record MMAP events on CPU 1 when tracing CPU 0
> test child finished with -1
> ---- end ----
> Miscellaneous Intel PT testing: FAILED!
> [root@...co ~]# 
> 
> Do I need some more recent machine or kernel?

I put it only in the cover letter sorry but "The first patch is a small Intel PT test for system-wide side band.  The
test fails before the patches are applied, passed afterwards."