linux-kernel - Re: [PROBLEM] perf report is broken in latest linus git

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Date:	Thu, 13 Aug 2009 15:02:18 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	paulus@...ba.org, linux-kernel@...r.kernel.org
Subject: Re: [PROBLEM] perf report is broken in latest linus git

On Thu, 2009-08-13 at 13:33 +0200, Peter Zijlstra wrote:
> > > Perhaps it's this commit:
> > > 
> > > 4d1e00a: perf symbol: Fix symbol parsing in certain cases: use the build-id as a symlink
> > > 
> > > it does not revert cleanly, so you might want to check out these two 
> > > commits:
> > > 
> > >   4d1e00a
> > >   4d1e00a~1
> > > 
> > > and build perf on both, and check with your anomalous perf.data 
> > > (without changing it) whether the output makes most sense.
> > 
> > The commit seems fine. Like I said, the perf.data file is busted even
> > with 2.6.31-rc4 userspace so I think it's a kernel bug.
> 
> Hrmm, does a -tip kernel work as expected? I'll go audit the kernel
> changes between -rc4 and -rc5.

tip/master seems to be broken too:

penberg@...berg-laptop:~/testing/jato$ perf report
# Samples: 65806
#
# Overhead  Command                            Shared Object  Symbol
# ........  .......  .......................................  ......
#
    64.31%     perf  /home/penberg/bin/perf                   [.] strlist__load
     3.10%     perf  /home/penberg/bin/jato                   [.] 0x0000000000c6e8
     1.61%     perf  [kernel]                                 [k] get_page_from_freelist
     1.13%     perf  /lib/tls/i686/cmov/libc-2.8.90.so        [.] _int_malloc
     1.11%     perf  /lib/tls/i686/cmov/libpthread-2.8.90.so  [.] 0x00000000012532
     1.08%     perf  /lib/tls/i686/cmov/libc-2.8.90.so        [.] _fitoa
     0.96%     perf                                 a7d23660  [.] 0x000000a7d23660
     0.86%     perf  /lib/tls/i686/cmov/libc-2.8.90.so        [.] ____strtold_l_internal
     0.85%     perf  /usr/lib/libz.so.1.2.3.3                 [.] 0x0000000000eef2
     0.83%     perf  /lib/tls/i686/cmov/libc-2.8.90.so        [.] __GI_strcmp
     0.74%     perf  /home/penberg/bin/jato                   [.] zalloc
     0.69%     perf  [kernel]                                 [k] scsi_dispatch_cmd
     0.66%     perf  /lib/tls/i686/cmov/libc-2.8.90.so        [.] getsubopt
     0.56%     perf  /lib/tls/i686/cmov/libc-2.8.90.so        [.] __realpath
     0.50%     perf  /usr/lib/libzip.so.1.0.0                 [.] _zip_get_name

penberg@...berg-laptop:~/src/linux/tools/perf$ git log|head -10
commit d1fa7782b090a3ab0f55c9003d7315b5f0f5e9d6
Merge: e93673b... daac07b...
Author: Ingo Molnar <mingo@...e.hu>
Date:   Thu Aug 13 10:37:33 2009 +0200

    Merge branch 'perfcounters/urgent'

commit daac07b2e6b77f1bd44104aa2f0593e5505f27d4
Author: Frederic Weisbecker <fweisbec@...il.com>
Date:   Thu Aug 13 10:27:19 2009 +0200

			Pekka


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