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perf diff: Add --percentage option

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The --percentage option is for controlling overhead percentage
displayed.  It can only receive either of "relative" or "absolute" and
affects -c delta output only.

For more information, please see previous commit same thing done to
"perf report".

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/r/1397145720-8063-5-git-send-email-namhyung@kernel.org
Signed-off-by: Jiri Olsa <jolsa@redhat.com>
This commit is contained in:
Namhyung Kim
2014-02-07 12:06:07 +09:00
committed by Jiri Olsa
parent 33db4568e1
commit 8810f6ced7
2 changed files with 40 additions and 11 deletions
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21
tools/perf/Documentation/perf-diff.txt
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@@ -33,17 +33,20 @@ OPTIONS
-d::
--dsos=::
Only consider symbols in these dsos. CSV that understands
file://filename entries.
file://filename entries. This option will affect the percentage
of the Baseline/Delta column. See --percentage for more info.
-C::
--comms=::
Only consider symbols in these comms. CSV that understands
file://filename entries.
file://filename entries. This option will affect the percentage
of the Baseline/Delta column. See --percentage for more info.
-S::
--symbols=::
Only consider these symbols. CSV that understands
file://filename entries.
file://filename entries. This option will affect the percentage
of the Baseline/Delta column. See --percentage for more info.
-s::
--sort=::
@@ -89,6 +92,14 @@ OPTIONS
--order::
Specify compute sorting column number.
--percentage::
Determine how to display the overhead percentage of filtered entries.
Filters can be applied by --comms, --dsos and/or --symbols options.
"relative" means it's relative to filtered entries only so that the
sum of shown entries will be always 100%. "absolute" means it retains
the original value before and after the filter is applied.
COMPARISON
----------
The comparison is governed by the baseline file. The baseline perf.data
@@ -157,6 +168,10 @@ with:
- period_percent being the % of the hist entry period value within
single data file
- with filtering by -C, -d and/or -S, period_percent might be changed
relative to how entries are filtered. Use --percentage=absolute to
prevent such fluctuation.
ratio
~~~~~
If specified the 'Ratio' column is displayed with value 'r' computed as: