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| author | Jiri Olsa <jolsa@redhat.com> | 2012-10-05 18:44:43 +0400 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2012-10-05 21:10:42 +0400 |
| commit | 81d5f95819953321a2557b0656b24ea10af9629c (patch) | |
| tree | 27efd993d93ab00da7fdfebe5c3563f1eba4d7f4 /tools/perf/Documentation/perf-diff.txt | |
| parent | 96c47f19846742bdfa3c153c8d26ccca5945586b (diff) | |
| download | linux-81d5f95819953321a2557b0656b24ea10af9629c.tar.xz | |
perf diff: Add weighted diff computation way to compare hist entries
Adding 'wdiff' as new computation way to compare hist entries.
If specified the 'Weighted diff' column is displayed with value 'd'
computed as:
d = B->period * WEIGHT-A - A->period * WEIGHT-B
- A/B being matching hist entry from first/second file specified
(or perf.data/perf.data.old) respectively.
- period being the hist entry period value
- WEIGHT-A/WEIGHT-B being user suplied weights in the the '-c' option
behind ':' separator like '-c wdiff:1,2'.
Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1349448287-18919-5-git-send-email-jolsa@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/Documentation/perf-diff.txt')
| -rw-r--r-- | tools/perf/Documentation/perf-diff.txt | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/tools/perf/Documentation/perf-diff.txt b/tools/perf/Documentation/perf-diff.txt index cff3d9b6e4a3..fa413ac914f5 100644 --- a/tools/perf/Documentation/perf-diff.txt +++ b/tools/perf/Documentation/perf-diff.txt @@ -78,7 +78,7 @@ OPTIONS -c:: --compute:: - Differential computation selection - delta,ratio (default is delta). + Differential computation selection - delta,ratio,wdiff (default is delta). If '+' is specified as a first character, the output is sorted based on the computation results. See COMPARISON METHODS section for more info. @@ -110,6 +110,19 @@ with: - period being the hist entry period value +wdiff +~~~~~ +If specified the 'Weighted diff' column is displayed with value 'd' computed as: + + d = B->period * WEIGHT-A - A->period * WEIGHT-B + + - A/B being matching hist entry from first/second file specified + (or perf.data/perf.data.old) respectively. + + - period being the hist entry period value + + - WEIGHT-A/WEIGHT-B being user suplied weights in the the '-c' option + behind ':' separator like '-c wdiff:1,2'. SEE ALSO -------- |