linux-kernel - Re: [GIT PULL 0/8] Annotation weekly ponies delivery

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Date:	Wed, 16 May 2012 14:57:49 +0900
From:	Namhyung Kim <namhyung.kim@....com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	linux-kernel@...r.kernel.org,
	Arjan van de Ven <arjan@...radead.org>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Mike Galbraith <efault@....de>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>, arnaldo.melo@...il.com,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [GIT PULL 0/8] Annotation weekly ponies delivery

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@...llo.nl>

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

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

  namhyung@...ong: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@...ry=0x7fffc5e1d0b0, n=n@...ry=24) at util/util.c:140
  #3  0x000000000043e4bb in __perf_evsel__read (evsel=evsel@...ry=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@...ry=0x77e1d8, argc=argc@...ry=4, argv=argv@...ry=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
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