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| author | Anton Blanchard <anton@samba.org> | 2014-09-09 08:59:29 +1000 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2014-09-17 17:08:10 -0300 |
| commit | d0b0d0406fe6743e734e1ba780155f8db5f713e6 (patch) | |
| tree | bfcfc7526ab33adf7a21ccdc5dc088db29864afa /tools/perf/util/symbol.c | |
| parent | 512fe365373b9c95a70b4b6357503ee74d27214f (diff) | |
| download | blackbird-op-linux-d0b0d0406fe6743e734e1ba780155f8db5f713e6.tar.gz blackbird-op-linux-d0b0d0406fe6743e734e1ba780155f8db5f713e6.zip | |
perf symbols: Ignore stripped vmlinux and fallback to kallsyms
If a vmlinux is stripped, perf will use it and ignore kallsyms. We
end up with useless profiles where everything maps to a few
runtime symbols:
63.39% swapper [kernel.kallsyms] [k] hcall_real_table
4.90% beam.smp [kernel.kallsyms] [k] hcall_real_table
4.44% beam.smp [kernel.kallsyms] [k] __sched_text_start
3.72% beam.smp [kernel.kallsyms] [k] __run_at_kexec
Detect this case and fallback to using kallsyms. This fixes the issue:
62.81% swapper [kernel.kallsyms] [k] snooze_loop
4.44% beam.smp [kernel.kallsyms] [k] __schedule
0.91% beam.smp [kernel.kallsyms] [k] _switch
0.73% beam.smp [kernel.kallsyms] [k] put_prev_entity
Signed-off-by: Anton Blanchard <anton@samba.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20140909085929.4a5a81f0@kryten
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/symbol.c')
0 files changed, 0 insertions, 0 deletions
