linux-kernel - Re: [GIT PULL||RFC 00/11] perf library and regression testing improvements

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Date:	Tue, 4 Jan 2011 14:59:00 +0100
From:	Stephane Eranian <eranian@...gle.com>
To:	Arnaldo Carvalho de Melo <acme@...radead.org>
Cc:	linux-kernel@...r.kernel.org,
	Frederic Weisbecker <fweisbec@...il.com>,
	Han Pingtian <phan@...hat.com>, Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Tom Zanussi <tzanussi@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	mingo@...e.hu
Subject: Re: [GIT PULL||RFC 00/11] perf library and regression testing improvements

Arnaldo,

The version of perf at tip-x86 commit 9274b36, segfaults for me:

$ gdb perf
(gdb) r stat date

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7fdc602eb6e0 (LWP 4590)]
cmd_stat (argc=1, argv=0x7fff6fa2a9f0, prefix=<value optimized out>)
at builtin-stat.c:206
206			update_stats(&ps->res_stats[i], count[i]);
(gdb) bt
#0  cmd_stat (argc=1, argv=0x7fff6fa2a9f0, prefix=<value optimized
out>) at builtin-stat.c:206
#1  0x0000000000405c8b in handle_internal_command (argc=2,
argv=0x7fff6fa2a9f0) at perf.c:286
#2  0x00000000004060b0 in main (argc=2, argv=0x7fff6fa2a680) at perf.c:403

Most like ps is NULL.


On Tue, Jan 4, 2011 at 8:16 AM, Ingo Molnar <mingo@...e.hu> wrote:
>
> * Arnaldo Carvalho de Melo <acme@...radead.org> wrote:
>
>> Hi Ingo, Peter et al,
>>
>>       Trying to simplify using the API for tools and more specifically for
>> 'perf test' regression tests, please take a look, perhaps starting from the last
>> changeset, that implements a regression test using the resulting library API.
>>
>>       It also reduces the 'perf' tool footprint by not using hard coded array
>> sizes, more need to be done, but should be a good start, one changeset shows a
>> good reduction in BSS use.
>>
>>       Suggestions for naming most welcome, I thought about using "event__",
>> but that is taken, "perf_event__", but thought it would clash with "event_t",
>> so used the jargon used for the '-e' parameters: "Event Selector", but don't
>> like it that much, what do you think?
>>
>>       Writing the first regression test I think there are more ways to simplify,
>> on top of these, like not requiring a thread_map, i.e. passing NULL for that
>> parameter would mean: self-monitor, etc.
>>
>>         If you are pleased as-is, please pull from:
>>
>> git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux-2.6 perf/test
>>
>> Regards,
>>
>> - Arnaldo
>>
>> Arnaldo Carvalho de Melo (11):
>>   perf tools: Introduce event selectors
>>   perf evsel: Adopt MATCH_EVENT macro from 'stat'
>>   perf util: Move do_read from session to util
>>   perf evsel: Delete the event selectors at exit
>>   perf evsel: Steal the counter reading routines from stat
>>   perf evsel: Introduce per cpu and per thread open helpers
>>   perf tools: Refactor cpumap to hold nr and the map
>>   perf tools: Refactor all_tids to hold nr and the map
>>   perf evsel: Use {cpu,thread}_map to shorten list of parameters
>>   perf evsel: Auto allocate resources needed for some methods
>>   perf test: Add test for counting open syscalls
>>
>>  tools/perf/Makefile                |    4 +
>>  tools/perf/builtin-record.c        |  152 +++++++--------
>>  tools/perf/builtin-stat.c          |  368 +++++++++++++++---------------------
>>  tools/perf/builtin-test.c          |   83 ++++++++
>>  tools/perf/builtin-top.c           |  221 ++++++++++++----------
>>  tools/perf/perf.c                  |    2 +
>>  tools/perf/util/cpumap.c           |  123 +++++++++---
>>  tools/perf/util/cpumap.h           |   10 +-
>>  tools/perf/util/evsel.c            |  186 ++++++++++++++++++
>>  tools/perf/util/evsel.h            |  115 +++++++++++
>>  tools/perf/util/header.c           |   15 +-
>>  tools/perf/util/header.h           |    3 +-
>>  tools/perf/util/parse-events.c     |   58 ++++--
>>  tools/perf/util/parse-events.h     |   18 ++-
>>  tools/perf/util/session.c          |   22 +--
>>  tools/perf/util/session.h          |    1 -
>>  tools/perf/util/thread.c           |   43 +++--
>>  tools/perf/util/thread.h           |   15 ++-
>>  tools/perf/util/trace-event-info.c |   30 ++--
>>  tools/perf/util/trace-event.h      |    5 +-
>>  tools/perf/util/util.c             |   17 ++
>>  tools/perf/util/util.h             |    1 +
>>  tools/perf/util/xyarray.c          |   20 ++
>>  tools/perf/util/xyarray.h          |   20 ++
>>  24 files changed, 1013 insertions(+), 519 deletions(-)
>>  create mode 100644 tools/perf/util/evsel.c
>>  create mode 100644 tools/perf/util/evsel.h
>>  create mode 100644 tools/perf/util/xyarray.c
>>  create mode 100644 tools/perf/util/xyarray.h
>
> Pulled, thanks a lot Arnaldo!
>
>        Ingo
>
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