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Arnaldo Carvalho de Melo 86a9eee047 perf diff: Introduce tool to show performance difference 
I guess it is enough to show some examples:

[root@doppio linux-2.6-tip]# rm -f perf.data*
[root@doppio linux-2.6-tip]# ls -la perf.data*
ls: cannot access perf.data*: No such file or directory
[root@doppio linux-2.6-tip]# 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) ]
[root@doppio linux-2.6-tip]# ls -la perf.data*
-rw------- 1 root root 74440 2009-12-14 20:03 perf.data
[root@doppio linux-2.6-tip]# 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 (~2692 samples) ]
[root@doppio linux-2.6-tip]# ls -la perf.data*
-rw------- 1 root root 74280 2009-12-14 20:03 perf.data
-rw------- 1 root root 74440 2009-12-14 20:03 perf.data.old
[root@doppio linux-2.6-tip]# perf diff | head -5
   1        -34994580     /lib64/libc-2.10.1.so   _IO_vfprintf_internal
   2        -15307806         [kernel.kallsyms]   __kmalloc
   3    +1   +3665941     /lib64/libc-2.10.1.so   __GI_memmove
   4    +4  +23508995     /lib64/libc-2.10.1.so   _int_malloc
   5    +7  +38538813         [kernel.kallsyms]   __d_lookup
[root@doppio linux-2.6-tip]# perf diff -p | head -5
   1        +1.00%     /lib64/libc-2.10.1.so   _IO_vfprintf_internal
   2                       [kernel.kallsyms]   __kmalloc
   3    +1             /lib64/libc-2.10.1.so   __GI_memmove
   4    +4             /lib64/libc-2.10.1.so   _int_malloc
   5    +7  -1.00%         [kernel.kallsyms]   __d_lookup
[root@doppio linux-2.6-tip]# perf diff -v | head -5
   1        361449551 326454971 -34994580     /lib64/libc-2.10.1.so   _IO_vfprintf_internal
   2        151009241 135701435 -15307806         [kernel.kallsyms]   __kmalloc
   3    +1  101805328 105471269  +3665941     /lib64/libc-2.10.1.so   __GI_memmove
   4    +4   78041440 101550435 +23508995     /lib64/libc-2.10.1.so   _int_malloc
   5    +7   59536172  98074985 +38538813         [kernel.kallsyms]   __d_lookup
[root@doppio linux-2.6-tip]# perf diff -vp | head -5
   1        9.00% 8.00% +1.00%     /lib64/libc-2.10.1.so   _IO_vfprintf_internal
   2        3.00% 3.00%                [kernel.kallsyms]   __kmalloc
   3    +1  2.00% 2.00%            /lib64/libc-2.10.1.so   __GI_memmove
   4    +4  2.00% 2.00%            /lib64/libc-2.10.1.so   _int_malloc
   5    +7  1.00% 2.00% -1.00%         [kernel.kallsyms]   __d_lookup
[root@doppio linux-2.6-tip]#

This should be enough for diffs where the system is non
volatile, i.e. when one doesn't updates binaries.

For volatile environments, stay tuned for the next perf tool
feature: a buildid cache populated by 'perf record', managed by
'perf buildid-cache' a-la ccache, and used by all the report
tools.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Stephen Hemminger <shemminger@vyatta.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>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
LKML-Reference: <1260828571-3613-3-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-12-15 08:50:29 +01:00
..
include perf symbols: Simplify symbol machinery setup 2009-11-24 16:37:02 +01:00
abspath.c perf: Enable more compiler warnings 2009-08-16 10:47:47 +02:00
alias.c perf_counter tools: Add more warnings and fix/annotate them 2009-07-01 12:49:48 +02:00
cache.h perf tools: Do not manually count string lengths 2009-10-13 11:55:31 +02:00
callchain.c perf tools: Unify debug messages mechanisms 2009-10-23 08:22:47 +02:00
callchain.h perf tools: Protect header files with a consistent style 2009-09-24 21:27:51 +02:00
color.c perf tools: Librarize trace_event() helper 2009-08-16 23:06:45 +02:00
color.h perf tools: Protect header files with a consistent style 2009-09-24 21:27:51 +02:00
config.c perf: Enable more compiler warnings 2009-08-16 10:47:47 +02:00
ctype.c perf tools: Move graph_line and graph_dotted_line from top 2009-11-23 21:55:20 +01:00
data_map.c perf session: Adopt the sample_type variable 2009-12-14 17:34:56 +01:00
debug.c perf tools: Unify debug messages mechanisms 2009-10-23 08:22:47 +02:00
debug.h perf tools: Debug.h needs to include event.h for event_t 2009-11-16 22:05:50 +01:00
debugfs.c perf tools: Add debugfs utility routines for perf 2009-11-08 18:01:34 +01:00
debugfs.h perf tools: Add debugfs utility routines for perf 2009-11-08 18:01:34 +01:00
environment.c
event.c perf session: Event statistics also are per session 2009-12-15 08:50:28 +01:00
event.h perf session: Event statistics also are per session 2009-12-15 08:50:28 +01:00
exec_cmd.c perf: Enable more compiler warnings 2009-08-16 10:47:47 +02:00
exec_cmd.h perf tools: Protect header files with a consistent style 2009-09-24 21:27:51 +02:00
generate-cmdlist.sh
header.c perf session: Ditch register_perf_file_handler 2009-12-14 16:57:15 +01:00
header.h perf tools: Introduce perf_session class 2009-12-12 07:42:12 +01:00
help.c perf_counter tools: Add more warnings and fix/annotate them 2009-07-01 12:49:48 +02:00
help.h perf tools: Protect header files with a consistent style 2009-09-24 21:27:51 +02:00
hist.c perf session: Move the hist_entries rb tree to perf_session 2009-12-14 16:57:18 +01:00
hist.h perf session: Move the hist_entries rb tree to perf_session 2009-12-14 16:57:18 +01:00
levenshtein.c
levenshtein.h perf tools: Protect header files with a consistent style 2009-09-24 21:27:51 +02:00
map.c perf session: Move kmaps to perf_session 2009-12-14 16:57:17 +01:00
pager.c perf_counter tools: Remove dead code 2009-06-27 06:06:39 +02:00
parse-events.c perf tools: Optimize parse_subsystem_tracepoint_event() 2009-12-07 08:09:29 +01:00
parse-events.h perf trace: Add filter Suppport 2009-10-15 11:35:23 +02:00
parse-options.c perf tools: Align long options which have no short forms 2009-12-10 08:30:28 +01:00
parse-options.h perf tools: Protect header files with a consistent style 2009-09-24 21:27:51 +02:00
path.c perf: Enable more compiler warnings 2009-08-16 10:47:47 +02:00
PERF-VERSION-GEN perf tools: Bump version to 0.0.2 2009-10-16 10:34:28 +02:00
probe-event.c perf tools: Correct size given to memset 2009-12-10 08:30:26 +01:00
probe-event.h perf probe: Support --del option 2009-12-09 07:26:53 +01:00
probe-finder.c perf probe: Fix strtailcmp() to compare s1and s2[0] 2009-12-07 18:33:20 +01:00
probe-finder.h perf/probes: Support function entry relative line number 2009-10-29 08:47:49 +01:00
quote.c perf: Fix read buffer overflow 2009-08-04 11:09:56 +02:00
quote.h perf tools: Protect header files with a consistent style 2009-09-24 21:27:51 +02:00
run-command.c perf: Enable more compiler warnings 2009-08-16 10:47:47 +02:00
run-command.h perf tools: Protect header files with a consistent style 2009-09-24 21:27:51 +02:00
session.c perf session: Adopt resolve_callchain 2009-12-14 17:34:55 +01:00
session.h perf session: Event statistics also are per session 2009-12-15 08:50:28 +01:00
sigchain.c
sigchain.h perf tools: Protect header files with a consistent style 2009-09-24 21:27:51 +02:00
sort.c perf util: Remove setup_sorting dups 2009-12-15 08:50:28 +01:00
sort.h perf diff: Introduce tool to show performance difference 2009-12-15 08:50:29 +01:00
strbuf.c perf_counter tools: Add more warnings and fix/annotate them 2009-07-01 12:49:48 +02:00
strbuf.h perf tools: Protect header files with a consistent style 2009-09-24 21:27:51 +02:00
string.c perf tools: Fix _GNU_SOURCE macro related strndup() build error 2009-12-02 09:24:56 +01:00
string.h perf probe: Add argv_split() from lib/argv_split.c 2009-12-01 08:20:02 +01:00
strlist.c strlist: Introduce strlist__entry and strlist__nr_entries methods 2009-07-11 19:20:25 +02:00
strlist.h perf tools: Protect header files with a consistent style 2009-09-24 21:27:51 +02:00
svghelper.c perf timechart: Improve the visual appearance of scheduler delays 2009-10-20 03:39:21 +02:00
svghelper.h perf tools: Protect header files with a consistent style 2009-09-24 21:27:51 +02:00
symbol.c perf session: Move kmaps to perf_session 2009-12-14 16:57:17 +01:00
symbol.h perf session: Move kmaps to perf_session 2009-12-14 16:57:17 +01:00
thread.c perf session: Move kmaps to perf_session 2009-12-14 16:57:17 +01:00
thread.h perf session: Move kmaps to perf_session 2009-12-14 16:57:17 +01:00
trace-event-info.c perf trace: Read_tracing_data should die() another day 2009-11-21 17:45:59 +01:00
trace-event-parse.c perf tools: Correct size given to memset 2009-12-10 08:30:26 +01:00
trace-event-perl.c perf trace/scripting: Don't display 'scripting unsupported' msg unnecessarily 2009-12-07 08:05:07 +01:00
trace-event-perl.h perf trace/scripting: Fix compile error when libperl not installed 2009-12-07 06:31:37 +01:00
trace-event-read.c perf tools: Misc small fixes 2009-12-06 18:15:02 +01:00
trace-event.h perf trace: Add interface to access perf data from Perl handlers 2009-11-28 10:04:27 +01:00
types.h perf tools: Protect header files with a consistent style 2009-09-24 21:27:51 +02:00
usage.c perf top: Fall back to cpu-clock-tick hrtimer sampling if no cycle counter available 2009-06-07 17:31:52 +02:00
util.h perf tools: Remove unused wrapper routines 2009-11-24 16:37:03 +01:00
values.c perf: Enable more compiler warnings 2009-08-16 10:47:47 +02:00
values.h perf tools: Protect header files with a consistent style 2009-09-24 21:27:51 +02:00
wrapper.c perf tools: Remove unused wrapper routines 2009-11-24 16:37:03 +01:00