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 |