linux-kernel - Re: [PATCH v5 2/8] perf: Use perf_pmu__open_file() and perf_pmu__scan

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Date:   Mon, 23 Jan 2023 10:36:36 +0000
From:   James Clark <james.clark@....com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     linux-perf-users@...r.kernel.org, tanmay@...vell.com,
        leo.yan@...aro.org, mike.leach@...aro.org, sgoutham@...vell.com,
        gcherian@...vell.com, lcherian@...vell.com, bbhushan2@...vell.com,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        John Garry <john.g.garry@...cle.com>,
        Will Deacon <will@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>, coresight@...ts.linaro.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/8] perf: Use perf_pmu__open_file() and
 perf_pmu__scan_file()



On 20/01/2023 17:43, Arnaldo Carvalho de Melo wrote:
> Em Fri, Jan 20, 2023 at 02:32:30PM -0300, Arnaldo Carvalho de Melo escreveu:
>> Em Fri, Jan 20, 2023 at 02:21:56PM -0300, Arnaldo Carvalho de Melo escreveu:
>>> Em Fri, Jan 20, 2023 at 02:36:55PM +0000, James Clark escreveu:
>>>> Remove some code that duplicates existing methods. Copy strings where
>>>> const strings are required.
>>>>
>>>> No functional changes.
>>>
>>>
>>> Have you used 'perf test'?
>>>
>>> [acme@...co perf]$ perf test -v python
>>> Couldn't bump rlimit(MEMLOCK), failures may take place when creating BPF maps, etc
>>>  19: 'import perf' in python                                         :
>>> --- start ---
>>> test child forked, pid 232379
>>> python usage test: "echo "import sys ; sys.path.append('/tmp/build/perf/python'); import perf" | '/usr/bin/python3' "
>>> Traceback (most recent call last):
>>>   File "<stdin>", line 1, in <module>
>>> ImportError: /tmp/build/perf/python/perf.cpython-310-x86_64-linux-gnu.so: undefined symbol: perf_pmu__scan_file
>>> test child finished with -1
>>> ---- end ----
>>> 'import perf' in python: FAILED!
>>> [acme@...co perf]$
>>
>> I added this to this cset, now it passes.
> 
> So, what I have is now at my tmp.perf/core branch, pending container
> testing, later today probably will move to perf/core, so that it gets
> exposure on linux-next for v6.3.
> 

Gah! Sorry, I must have only run the Coresight tests. I will make sure
all the tests are passing on my setup so it's easier to spot next time.

Thanks for the fix.