perf diff: Documentation -c cycles option

Documentation the new computation selection 'cycles'.

 v4:
 ---
 Change the column 'Block cycles diff [start:end]' to
 '[Program Block Range] Cycles Diff'

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Reviewed-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jin Yao <yao.jin@intel.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1561713784-30533-8-git-send-email-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jin Yao 2019-06-28 17:23:04 +08:00 committed by Arnaldo Carvalho de Melo
parent b10c78c509
commit c8f7bc1a08

View File

@ -90,9 +90,10 @@ OPTIONS
-c::
--compute::
Differential computation selection - delta, ratio, wdiff, delta-abs
(default is delta-abs). Default can be changed using diff.compute
config option. See COMPARISON METHODS section for more info.
Differential computation selection - delta, ratio, wdiff, cycles,
delta-abs (default is delta-abs). Default can be changed using
diff.compute config option. See COMPARISON METHODS section for
more info.
-p::
--period::
@ -280,6 +281,16 @@ If specified the 'Weighted diff' column is displayed with value 'd' computed as:
- WEIGHT-A being the weight of the data file
- WEIGHT-B being the weight of the baseline data file
cycles
~~~~~~
If specified the '[Program Block Range] Cycles Diff' column is displayed.
It displays the cycles difference of same program basic block amongst
two perf.data. The program basic block is the code between two branches.
'[Program Block Range]' indicates the range of a program basic block.
Source line is reported if it can be found otherwise uses symbol+offset
instead.
SEE ALSO
--------
linkperf:perf-record[1], linkperf:perf-report[1]