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c351c28161
That means that almost everything you can do with 'perf report'
can be done with 'perf diff', for instance:
$ perf record -f find / > /dev/null
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.062 MB perf.data (~2699
samples) ] $ perf record -f find / > /dev/null
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.062 MB perf.data (~2687
samples) ] perf diff | head -8
9.02% +1.00% find libc-2.10.1.so [.] _IO_vfprintf_internal
2.91% -1.00% find [kernel] [k] __kmalloc
2.85% -1.00% find [kernel] [k] ext4_htree_store_dirent
1.99% -1.00% find [kernel] [k] _atomic_dec_and_lock
2.44% find [kernel] [k] half_md4_transform
$
So if you want to zoom into libc:
$ perf diff --dsos libc-2.10.1.so | head -8
37.34% find [.] _IO_vfprintf_internal
10.34% find [.] __GI_memmove
8.25% +2.00% find [.] _int_malloc
5.07% -1.00% find [.] __GI_mempcpy
7.62% +2.00% find [.] _int_free
$
And if there were multiple commands using libc, it is also
possible to aggregate them all by using --sort symbol:
$ perf diff --dsos libc-2.10.1.so --sort symbol | head -8
37.34% [.] _IO_vfprintf_internal
10.34% [.] __GI_memmove
8.25% +2.00% [.] _int_malloc
5.07% -1.00% [.] __GI_mempcpy
7.62% +2.00% [.] _int_free
$
The displacement column now is off by default, to use it:
perf diff -m --dsos libc-2.10.1.so --sort symbol | head -8
37.34% [.] _IO_vfprintf_internal
10.34% [.] __GI_memmove
8.25% +2.00% [.] _int_malloc
5.07% -1.00% +2 [.] __GI_mempcpy
7.62% +2.00% -1 [.] _int_free
$
Using -t/--field-separator can be used for scripting:
$ perf diff -t, -m --dsos libc-2.10.1.so --sort symbol | head -8
37.34, , ,[.] _IO_vfprintf_internal
10.34, , ,[.] __GI_memmove
8.25,+2.00%, ,[.] _int_malloc
5.07,-1.00%, +2,[.] __GI_mempcpy
7.62,+2.00%, -1,[.] _int_free
6.99,+1.00%, -1,[.] _IO_new_file_xsputn
1.89,-2.00%, +4,[.] __readdir64
$
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1260978567-550-1-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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|---|---|---|
| .. | ||
| include | ||
| abspath.c | ||
| alias.c | ||
| cache.h | ||
| callchain.c | ||
| callchain.h | ||
| color.c | ||
| color.h | ||
| config.c | ||
| ctype.c | ||
| data_map.c | ||
| debug.c | ||
| debug.h | ||
| debugfs.c | ||
| debugfs.h | ||
| environment.c | ||
| event.c | ||
| event.h | ||
| exec_cmd.c | ||
| exec_cmd.h | ||
| generate-cmdlist.sh | ||
| header.c | ||
| header.h | ||
| help.c | ||
| help.h | ||
| hist.c | ||
| hist.h | ||
| levenshtein.c | ||
| levenshtein.h | ||
| map.c | ||
| pager.c | ||
| parse-events.c | ||
| parse-events.h | ||
| parse-options.c | ||
| parse-options.h | ||
| path.c | ||
| PERF-VERSION-GEN | ||
| probe-event.c | ||
| probe-event.h | ||
| probe-finder.c | ||
| probe-finder.h | ||
| quote.c | ||
| quote.h | ||
| run-command.c | ||
| run-command.h | ||
| session.c | ||
| session.h | ||
| sigchain.c | ||
| sigchain.h | ||
| sort.c | ||
| sort.h | ||
| strbuf.c | ||
| strbuf.h | ||
| string.c | ||
| string.h | ||
| strlist.c | ||
| strlist.h | ||
| svghelper.c | ||
| svghelper.h | ||
| symbol.c | ||
| symbol.h | ||
| thread.c | ||
| thread.h | ||
| trace-event-info.c | ||
| trace-event-parse.c | ||
| trace-event-perl.c | ||
| trace-event-perl.h | ||
| trace-event-read.c | ||
| trace-event.h | ||
| types.h | ||
| usage.c | ||
| util.h | ||
| values.c | ||
| values.h | ||
| wrapper.c | ||