linux-kernel - Re: [PATCH] perf record: adding dummy event before mapping

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Message-ID: <CANLsYkw4EaU=w-CeEqohPiVL4Spj58RC+1JLkWgoJOpX3Qbv8A@mail.gmail.com>
Date:	Fri, 18 Sep 2015 17:38:22 -0600
From:	Mathieu Poirier <mathieu.poirier@...aro.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	a.p.zijlstra@...llo.nl, Ingo Molnar <mingo@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH] perf record: adding dummy event before mapping

On 18 September 2015 at 14:49, Arnaldo Carvalho de Melo <acme@...nel.org> wrote:
> Em Fri, Sep 18, 2015 at 02:42:04PM -0600, Mathieu Poirier escreveu:
>> The parameters of function 'perf_evsel__open()' in
>> 'record_open()' have been changed to use the evsel's cpus and
>> threads rather than the evlist since:
>>
>> commit d988d5ee6478 ("perf evlist: Open event on evsel cpus and threads")
>>
>> This works fine for as long as all the events have been added to
>> the evlist before function 'perf_evlist__create_maps()' is called
>> since the latter will take care of pushing the cpus and threads of
>> the evlist to each of the evsel in the list.
>>
>> As function 'auxtrace_record__options()' adds a "dummy:u" event to
>> the evlist it is important that it runs before
>> 'perf_evlist__create_maps()'.
>
> What tree is this patch for? Please take a look at tip/master, there are
> patches there that should address this issue, please report if not.
>
> Namely, hey, it was already merged by Linus, see:
>
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/log/tools
>
> There is a set of very small patches by Adrian Hunter fixing the setting
> of evsel->{cpus,threads}
>
> Can you check with Linus's git repo? I bet you tried with 4.3-rc1?

Yes, it was for 4.3-rc1.  I'll try tip and will get back to you if a
problem still exists.

>
> - Arnaldo
>
>> Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
>> ---
>>  tools/perf/builtin-record.c | 8 ++++----
>>  1 file changed, 4 insertions(+), 4 deletions(-)
>>
>> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
>> index 142eeb341b29..630a7a8e3970 100644
>> --- a/tools/perf/builtin-record.c
>> +++ b/tools/perf/builtin-record.c
>> @@ -1183,14 +1183,14 @@ int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused)
>>               goto out_symbol_exit;
>>       }
>>
>> -     err = -ENOMEM;
>> -     if (perf_evlist__create_maps(rec->evlist, &rec->opts.target) < 0)
>> -             usage_with_options(record_usage, record_options);
>> -
>>       err = auxtrace_record__options(rec->itr, rec->evlist, &rec->opts);
>>       if (err)
>>               goto out_symbol_exit;
>>
>> +     err = -ENOMEM;
>> +     if (perf_evlist__create_maps(rec->evlist, &rec->opts.target) < 0)
>> +             usage_with_options(record_usage, record_options);
>> +
>>       if (record_opts__config(&rec->opts)) {
>>               err = -EINVAL;
>>               goto out_symbol_exit;
>> --
>> 1.9.1
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