Re: [PROBLEM] perf report is broken in latest linus git
From: Pekka Enberg
Date: Thu Aug 13 2009 - 08:24:16 EST
On Thu, 2009-08-13 at 15:02 +0300, Pekka Enberg wrote:
> 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@penberg-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@penberg-laptop:~/src/linux/tools/perf$ git log|head -10
> commit d1fa7782b090a3ab0f55c9003d7315b5f0f5e9d6
> Merge: e93673b... daac07b...
> Author: Ingo Molnar <mingo@xxxxxxx>
> Date: Thu Aug 13 10:37:33 2009 +0200
>
> Merge branch 'perfcounters/urgent'
>
> commit daac07b2e6b77f1bd44104aa2f0593e5505f27d4
> Author: Frederic Weisbecker <fweisbec@xxxxxxxxx>
> Date: Thu Aug 13 10:27:19 2009 +0200
v2.6.31-rc5 is fine:
# Samples: 62768
#
# Overhead Command Shared Object Symbol
# ........ ....... ............................................. ......
#
68.45% jato /home/penberg/bin/jato [.] gc_map_init
2.08% jato /lib/tls/i686/cmov/libc-2.8.90.so [.] _int_malloc
1.79% jato /lib/tls/i686/cmov/libc-2.8.90.so [.] __GI_strcmp
1.49% jato [kernel] [k] get_page_from_freelist
1.33% jato /lib/tls/i686/cmov/libc-2.8.90.so [.] __GI___libc_malloc
1.11% jato /home/penberg/bin/jato [.] zalloc
1.04% jato a7c02842 [.] 0x000000a7c02842
0.92% jato /usr/lib/libzip.so.1.0.0 [.] _zip_get_name
0.76% jato /home/penberg/bin/jato [.] cafebabe_constant_info_utf8_compare
0.72% jato /lib/tls/i686/cmov/libpthread-2.8.90.so [.] 0x00000000007a2e
0.64% jato /usr/lib/libz.so.1.2.3.3 [.] 0x00000000001a0a
0.53% jato /home/penberg/bin/jato [.] allocate_registers
0.51% jato /home/penberg/bin/jato [.] analyze_liveness
0.51% jato /home/penberg/bin/jato [.] split_interval_at
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