From: Pekka Enberg <penberg@cs.helsinki.fi>
To: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
paulus@samba.org, linux-kernel@vger.kernel.org
Subject: Re: [PROBLEM] perf report is broken in latest linus git
Date: Thu, 13 Aug 2009 12:47:17 +0300 [thread overview]
Message-ID: <1250156837.8141.4.camel@penberg-laptop> (raw)
In-Reply-To: <20090813093648.GA22762@elte.hu>
Hi Ingo,
On Thu, 2009-08-13 at 11:36 +0200, Ingo Molnar wrote:
> * Pekka Enberg <penberg@cs.helsinki.fi> wrote:
>
> > Latest Linus git kernel with -rc4 perf userspace:
> >
> > penberg@penberg-laptop:~/testing/jato$ perf record -f jato HelloWorldSwing
> > [ perf record: Captured and wrote 1.402 MB perf.data (~61261 samples) ]
> >
> > penberg@penberg-laptop:~/testing/jato$ perf report --sort comm,dso,symbol|head -30
> > # Samples: 60457
> > #
> > # Overhead Command Shared Object Symbol
> > # ........ ....... ....................................... ......
> > #
> >
> > [ Note: the jato executable doesn't appear anywhere in the trace. I'm
> > pretty sure the libzip functions, for example, are from jato, not perf. ]
> >
> > 36.14% perf /home/penberg/bin/perf [.] dso__synthesize_plt_symbols
> > 35.20% perf /home/penberg/bin/perf [.] dso__new
> > 3.57% perf /home/penberg/bin/jato [.] 0x0000000000c910
>
> 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.
Pekka
4d1e00a~1:
penberg@penberg-laptop:~/testing/jato$ perf report
# Samples: 57821
#
# Overhead Command Shared Object Symbol
# ........ ....... ....................................... ......
#
73.55% perf /home/penberg/bin/perf [.] dso__synthesize_plt_symbols
6.54% perf /lib/tls/i686/cmov/libc-2.8.90.so [.] 0x0000000014b8c0
3.31% perf /home/penberg/bin/jato [.] 0x0000000000c910
1.37% perf [kernel] [k] get_page_from_freelist
1.05% perf /home/penberg/bin/perf [.] dso__load_sym
0.91% perf /usr/lib/libzip.so.1.0.0 [.] _zip_get_name
0.59% perf /lib/tls/i686/cmov/libc-2.8.90.so [.] __GI_strcmp
0.57% perf /usr/lib/libfontconfig.so.1.3.0 [.] 0x00000000019700
0.53% perf /usr/lib/libz.so.1.2.3.3 [.] 0x0000000000f0c5
0.49% perf /home/penberg/bin/perf [.] dso__load_kernel
4d1e00a:
penberg@penberg-laptop:~/testing/jato$ perf report
# Samples: 57821
#
# Overhead Command Shared Object Symbol
# ........ ....... ....................................... ......
#
73.55% perf /home/penberg/bin/perf [.] dso__synthesize_plt_symbols
6.53% perf /lib/tls/i686/cmov/libc-2.8.90.so [.] 0x0000000014b8c0
3.31% perf /home/penberg/bin/jato [.] 0x0000000000c910
1.37% perf [kernel] [k] get_page_from_freelist
1.05% perf /home/penberg/bin/perf [.] dso__load_sym
0.91% perf /usr/lib/libzip.so.1.0.0 [.] _zip_get_name
0.59% perf /lib/tls/i686/cmov/libc-2.8.90.so [.] __GI_strcmp
0.57% perf /usr/lib/libfontconfig.so.1.3.0 [.] 0x00000000019700
0.53% perf /usr/lib/libz.so.1.2.3.3 [.] 0x0000000000f0c5
0.49% perf /home/penberg/bin/perf [.] dso__load_kernel
0.43% perf /home/penberg/bin/perf [.] cmd_stat
0.35% perf /home/penberg/bin/perf [.] store_aux
0.34% perf [kernel] [k] kunmap_atomic
0.33% perf /home/penberg/bin/perf [.] quote_c_style_counted
0.31% perf /lib/tls/i686/cmov/libc-2.8.90.so [.] _int_malloc
0.29% perf /home/penberg/bin/perf [.] 0x00000000026951
0.29% perf /home/penberg/bin/perf [.] strbuf_addf
0.28% perf /usr/lib/libzip.so.1.0.0 [.] _zip_name_locate
next prev parent reply other threads:[~2009-08-13 9:47 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-13 9:28 [PROBLEM] perf report is broken in latest linus git Pekka Enberg
2009-08-13 9:36 ` Ingo Molnar
2009-08-13 9:47 ` Pekka Enberg [this message]
2009-08-13 11:33 ` Peter Zijlstra
2009-08-13 12:02 ` Pekka Enberg
2009-08-13 12:24 ` Pekka Enberg
2009-08-13 14:14 ` [PATCH] perf_counter: Report the cloning task as parent on perf_counter_fork() Peter Zijlstra
2009-08-13 14:18 ` [tip:perfcounters/urgent] " tip-bot for Peter Zijlstra
2009-08-15 8:58 ` [PATCH] " Pekka Enberg
2009-08-15 9:13 ` Ingo Molnar
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