linux-kernel - Re: [PATCH v3 11/18] perf dso: Update use of pthread mutex

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Date:   Fri, 26 Aug 2022 20:34:20 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Darren Hart <dvhart@...radead.org>,
        Davidlohr Bueso <dave@...olabs.net>,
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        Nathan Chancellor <nathan@...nel.org>,
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        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
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        Remi Bernon <rbernon@...eweavers.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        bpf@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH v3 11/18] perf dso: Update use of pthread mutex

On 26/08/22 19:05, Ian Rogers wrote:
> On Fri, Aug 26, 2022 at 3:37 AM Adrian Hunter <adrian.hunter@...el.com> wrote:
>>
>> On 24/08/22 18:38, Ian Rogers wrote:
>>> Switch to the use of mutex wrappers that provide better error checking.
>>>
>>> Signed-off-by: Ian Rogers <irogers@...gle.com>
>>> ---
>>>  tools/perf/util/dso.c    | 12 ++++++------
>>
>> Some not done yet
>>
>> $ grep -i pthread_mut tools/perf/util/dso.c
>> static pthread_mutex_t dso__data_open_lock = PTHREAD_MUTEX_INITIALIZER;
>>         pthread_mutex_lock(&dso__data_open_lock);
>>         pthread_mutex_unlock(&dso__data_open_lock);
>>         if (pthread_mutex_lock(&dso__data_open_lock) < 0)
>>                 pthread_mutex_unlock(&dso__data_open_lock);
>>         pthread_mutex_unlock(&dso__data_open_lock);
>>         pthread_mutex_lock(&dso__data_open_lock);
>>         pthread_mutex_unlock(&dso__data_open_lock);
>>         pthread_mutex_lock(&dso__data_open_lock);
>>         pthread_mutex_unlock(&dso__data_open_lock);
> 
> Yes, these are all solely dso__data_open_lock that lacks any clear
> init/exit code to place the initialization/destruction hooks onto. I
> don't plan to alter these in this patch set.

Perhaps that could be explained in the change log.

But why not just add init / exit code.  Could be called out
of main(), or maybe use __attribute__((constructor)) /
__attribute__((destructor))