From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Stephane Eranian <eranian@google.com>
Cc: LKML <linux-kernel@vger.kernel.org>, Jiri Olsa <jolsa@kernel.org>,
Namhyung Kim <namhyung@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>,
Adrian Hunter <adrian.hunter@intel.com>,
"ak@linux.intel.com" <ak@linux.intel.com>
Subject: Re: [RFC] perf record: missing buildid for callstack modules
Date: Thu, 7 Jan 2016 18:59:45 -0300 [thread overview]
Message-ID: <20160107215945.GA19314@kernel.org> (raw)
In-Reply-To: <CABPqkBT3SV1qGuxLaA_Myz4wbs+KWJ3kLnqyhkTcpjism40JQw@mail.gmail.com>
Em Thu, Jan 07, 2016 at 01:56:14PM -0800, Stephane Eranian escreveu:
> Hi,
>
> Whenever you do:
>
> $ perf record -g -a sleep 10
>
> Perf will collect the callstack for each sample. At the end of the
> run, perf record
> adds the buildid for all dso with at least one sample. But when it does this, it
> only looks at the sampled IP and ignore the modules traversed by the callstack.
> That means that, it is not possible to uniquely identify the modules executed,
> unless they had at least one IP sample captured. But this is not
> always the case.
>
> How about providing an option to perf record to force collecting
> buildid for all IPs
> captured in the callstack? I understand that would cost more at the end of the
> collection, but this would be beneficial to several monitoring scenarios.
I agree, would consider applying a patch that provides the option but
does not do this by default.
- Arnaldo
next prev parent reply other threads:[~2016-01-07 21:59 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-07 21:56 [RFC] perf record: missing buildid for callstack modules Stephane Eranian
2016-01-07 21:57 ` Andi Kleen
2016-01-07 22:00 ` Stephane Eranian
2016-01-07 21:59 ` Arnaldo Carvalho de Melo [this message]
2016-01-07 22:00 ` Stephane Eranian
2016-01-07 22:47 ` Namhyung Kim
2016-01-07 23:47 ` Arnaldo Carvalho de Melo
2016-01-08 18:01 ` Stephane Eranian
2016-01-08 18:19 ` Arnaldo Carvalho de Melo
2016-01-11 17:30 ` Peter Zijlstra
2016-01-11 18:22 ` Arnaldo Carvalho de Melo
2016-01-11 20:06 ` Stephane Eranian
2016-01-12 10:39 ` Ingo Molnar
2016-01-12 11:35 ` Peter Zijlstra
2016-01-12 12:18 ` Ingo Molnar
2016-01-12 13:40 ` Peter Zijlstra
2016-01-12 14:38 ` Arnaldo Carvalho de Melo
2016-01-12 15:34 ` Peter Zijlstra
2016-01-12 15:48 ` Arnaldo Carvalho de Melo
2016-01-12 16:10 ` Peter Zijlstra
2016-01-12 16:27 ` Peter Zijlstra
2016-01-12 17:15 ` Arnaldo Carvalho de Melo
2016-01-13 10:21 ` Ingo Molnar
2016-01-13 12:40 ` Peter Zijlstra
2016-01-14 11:27 ` Ingo Molnar
2016-01-14 11:36 ` Peter Zijlstra
2016-01-15 1:59 ` Stephane Eranian
2016-01-15 9:34 ` Peter Zijlstra
2016-01-15 18:58 ` Stephane Eranian
2016-01-15 19:49 ` Arnaldo Carvalho de Melo
2016-01-15 21:49 ` Stephane Eranian
2016-01-15 21:36 ` Peter Zijlstra
2016-01-12 21:02 ` Stephane Eranian
2016-01-12 13:08 ` One Thousand Gnomes
2016-01-12 14:34 ` Arnaldo Carvalho de Melo
2016-01-12 15:37 ` Peter Zijlstra
2016-01-13 10:25 ` Ingo Molnar
2016-01-12 14:23 ` Arnaldo Carvalho de Melo
2016-01-13 9:57 ` Ingo Molnar
2016-01-13 15:27 ` Arnaldo Carvalho de Melo
2016-01-19 14:56 ` Namhyung Kim
2016-01-19 15:27 ` Peter Zijlstra
2016-01-19 15:48 ` Arnaldo Carvalho de Melo
2016-01-09 10:31 ` Namhyung Kim
2016-01-11 9:27 ` Adrian Hunter
2016-01-11 11:02 ` Namhyung Kim
2016-01-11 11:54 ` Adrian Hunter
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