Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1754487Ab2EPF7r (ORCPT <rfc822;w@1wt.eu>);
	Wed, 16 May 2012 01:59:47 -0400
Received: from LGEMRELSE1Q.lge.com ([156.147.1.111]:50440 "EHLO
	LGEMRELSE1Q.lge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1750858Ab2EPF7q (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Wed, 16 May 2012 01:59:46 -0400
X-AuditID: 9c93016f-b7cecae000000e00-5f-4fb3424bc146
From: Namhyung Kim <namhyung.kim@lge.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Arnaldo Carvalho de Melo <acme@infradead.org>,
        linux-kernel@vger.kernel.org, Arjan van de Ven <arjan@infradead.org>,
        David Ahern <dsahern@gmail.com>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        Mike Galbraith <efault@gmx.de>, Paul Mackerras <paulus@samba.org>,
        Stephane Eranian <eranian@google.com>, arnaldo.melo@gmail.com,
        Arnaldo Carvalho de Melo <acme@redhat.com>
Subject: Re: [GIT PULL 0/8] Annotation weekly ponies delivery
References: <1336852387-16322-1-git-send-email-acme@infradead.org>
	<CA+55aFxeqrCj71fSe2r9kwzyO9q2BT9A89f7nLUgbrTG_uPP2g@mail.gmail.com>
	<1336994000.2443.24.camel@twins> <20120514115551.GA6479@gmail.com>
	<1337007985.1552.5.camel@leonhard> <1337077973.27694.24.camel@twins>
	<1337093080.1493.22.camel@leonhard> <1337101633.27694.92.camel@twins>
Date: Wed, 16 May 2012 14:57:49 +0900
In-Reply-To: <1337101633.27694.92.camel@twins> (Peter Zijlstra's message of
	"Tue, 15 May 2012 19:07:13 +0200")
Message-ID: <87liksd5wi.fsf@sejong.aot.lge.com>
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.95 (gnu/linux)
MIME-Version: 1.0
Content-Type: text/plain
X-Brightmail-Tracker: AAAAAA==
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org
Content-Length: 2344
Lines: 57

Hi,

On Tue, 15 May 2012 19:07:13 +0200, Peter Zijlstra wrote:
> This does indeed make it work again:
>
> pre patch:
>
> [ perf record: Woken up 1 times to write data ]
> [ perf record: Captured and wrote 0.005 MB perf.data (~212 samples) ]
>
> post patch:
>
> [ perf record: Woken up 209 times to write data ]
> [ perf record: Captured and wrote 54.931 MB perf.data (~2399974 samples) ]
>
> So please do send as a proper patch, and you can add:
>
> Acked-and-tested-by: Peter Zijlstra <a.p.zijlstra@chello.nl>

Hmm.. but it seems this breaks my 'perf stat -g' - it doesn't
respond any more (even for ^C):

  namhyung@sejong:perf$ ./perf stat -g sleep 1
  ^C^C^C^C^\Quit (core dumped)

  namhyung@sejong:perf$ gdb ./perf core.11964
  [SNIP]
  Core was generated by `./perf stat -g sleep 1'.
  Program terminated with signal 3, Quit.
  #0  0x0000003fd800e090 in __read_nocancel () from /lib64/libpthread.so.0
  [SNIP]
  (gdb) bt
  #0  0x0000003fd800e090 in __read_nocancel () from /lib64/libpthread.so.0
  #1  0x000000000047fa00 in read (__nbytes=24, __buf=0x7fffc5e1d0b0, __fd=0) at /usr/include/bits/unistd.h:45
  #2  readn (fd=0, buf=<optimized out>, buf@entry=0x7fffc5e1d0b0, n=n@entry=24) at util/util.c:140
  #3  0x000000000043e4bb in __perf_evsel__read (evsel=evsel@entry=0xc7e700, ncpus=<optimized out>, nthreads=1, scale=true)
      at util/evsel.c:267
  #4  0x0000000000422777 in read_counter_aggr (counter=0xc7e700) at builtin-stat.c:360
  #5  run_perf_stat (argv=0x7fffc5e1d510, argc=2) at builtin-stat.c:528
  #6  cmd_stat (argc=2, argv=0x7fffc5e1d510, prefix=<optimized out>) at builtin-stat.c:1251
  #7  0x0000000000414723 in run_builtin (p=p@entry=0x77e1d8, argc=argc@entry=4, argv=argv@entry=0x7fffc5e1d510) at perf.c:273
  #8  0x0000000000413f3b in handle_internal_command (argv=0x7fffc5e1d510, argc=4) at perf.c:345
  #9  run_argv (argv=0x7fffc5e1d300, argcp=0x7fffc5e1d30c) at perf.c:389
  #10 main (argc=4, argv=0x7fffc5e1d510) at perf.c:487


In fact, my perf stat -g was already broken - it cannot count at
all on my SNB box. I'll investigate it more.

Any thoughts?

Namhyung
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/