From: David Ahern <dsahern@gmail.com>
To: Adrian Hunter <adrian.hunter@intel.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
linux-kernel@vger.kernel.org,
Frederic Weisbecker <fweisbec@gmail.com>,
Jiri Olsa <jolsa@redhat.com>, Mike Galbraith <efault@gmx.de>,
Namhyung Kim <namhyung@gmail.com>,
Paul Mackerras <paulus@samba.org>,
Peter Zijlstra <peterz@infradead.org>,
Stephane Eranian <eranian@google.com>
Subject: Re: [PATCH V2 12/15] perf tools: allow non-matching sample types
Date: Mon, 01 Jul 2013 12:53:55 -0600 [thread overview]
Message-ID: <51D1D043.5030509@gmail.com> (raw)
In-Reply-To: <51D14CB6.206@intel.com>
On 7/1/13 3:32 AM, Adrian Hunter wrote:
> Snip
>
>>
>> While this works for a combined S/W and tracepoint events session, I do not
>> like promoting sample types to the minimum compatible level for all events
>> in the session. perf needs to allow each event to have its own sample_type
>> and not force a minimal compatibility.
>
> Why? The impact is small. The kernel API is completely unchanged.
I'd like to see libperf become a stable, usable library - usable by more
than the perf binary and its builtin commands. I have already done this
once for a daemon, and it was a PITA to get the specific use functional
without memory leaks/growth in the libperf part.
With respect to this specific patch it means appropriate flexibility in
the data collected for events. ie., each event can have its own
sample_type. For example if the tracepoint already contains task
information TID is not needed - and IP may not be wanted either. The
code processing the samples should not require all events to have some
minimum data format - that just wastes buffer space.
David
next prev parent reply other threads:[~2013-07-01 18:54 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-27 7:54 [PATCH V2 00/15] perf tools: some fixes and tweaks Adrian Hunter
2013-06-27 7:54 ` [PATCH V2 01/15] perf tools: remove unused parameter Adrian Hunter
2013-06-27 7:54 ` [PATCH V2 02/15] perf tools: fix missing tool parameter Adrian Hunter
2013-06-27 7:54 ` [PATCH V2 03/15] perf tools: fix missing 'finished_round' Adrian Hunter
2013-06-27 7:54 ` [PATCH V2 04/15] perf tools: fix parse_events_terms() segfault on error path Adrian Hunter
2013-06-27 7:54 ` [PATCH V2 05/15] perf tools: fix new_term() missing free " Adrian Hunter
2013-06-27 7:54 ` [PATCH V2 06/15] perf tools: fix parse_events_terms() freeing local variable " Adrian Hunter
2013-06-27 16:13 ` David Ahern
2013-06-28 6:32 ` Adrian Hunter
2013-06-28 13:41 ` David Ahern
2013-06-28 13:57 ` Jiri Olsa
2013-06-27 7:54 ` [PATCH V2 07/15] perf tools: add const specifier to perf_pmu__find name parameter Adrian Hunter
2013-06-27 7:55 ` [PATCH V2 08/15] perf tools: tidy duplicated munmap code Adrian Hunter
2013-06-27 7:55 ` [PATCH V2 09/15] perf tools: validate perf event header size Adrian Hunter
2013-06-27 7:55 ` [PATCH V2 10/15] perf tools: add debug prints Adrian Hunter
2013-06-27 7:55 ` [PATCH V2 11/15] perf tools: fix symbol_conf.nr_events Adrian Hunter
2013-06-27 7:55 ` [PATCH V2 12/15] perf tools: allow non-matching sample types Adrian Hunter
2013-06-27 16:39 ` David Ahern
2013-07-01 9:32 ` Adrian Hunter
2013-07-01 18:53 ` David Ahern [this message]
2013-07-01 19:10 ` Stephane Eranian
2013-07-02 6:58 ` Adrian Hunter
2013-07-03 6:40 ` Stephane Eranian
2013-07-02 7:09 ` Adrian Hunter
2013-07-03 6:44 ` Stephane Eranian
2013-08-26 18:54 ` Arnaldo Carvalho de Melo
2013-06-27 7:55 ` [PATCH V2 13/15] perf tools: struct thread has a tid not a pid Adrian Hunter
2013-06-27 7:55 ` [PATCH V2 14/15] perf tools: add pid to struct thread Adrian Hunter
2013-06-27 16:52 ` David Ahern
2013-06-27 7:55 ` [PATCH V2 15/15] perf tools: fix ppid in thread__fork() Adrian Hunter
2013-06-27 16:57 ` David Ahern
2013-06-28 6:47 ` Adrian Hunter
2013-06-28 13:46 ` David Ahern
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