Messages in this thread | | | Subject | Re: [PROBLEM] perf report is broken in latest linus git | From | Pekka Enberg <> | Date | Thu, 13 Aug 2009 12:47:17 +0300 |
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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
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