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Commit c8f7bc1a authored by Jin Yao's avatar Jin Yao Committed by Arnaldo Carvalho de Melo
Browse files

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: default avatarJin Yao <yao.jin@linux.intel.com>
Reviewed-by: default avatarJiri 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: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent b10c78c5

tools/perf/Documentation/perf-diff.txt

+14 −3
Original line number Original line Diff line number Diff line
@@ -90,9 +90,10 @@ OPTIONS 




-c::

-c::

--compute::

--compute::

        Differential computation selection - delta, ratio, wdiff, delta-abs

        Differential computation selection - delta, ratio, wdiff, cycles,

        (default is delta-abs).  Default can be changed using diff.compute

        delta-abs (default is delta-abs).  Default can be changed using

        config option.  See COMPARISON METHODS section for more info.

        diff.compute config option.  See COMPARISON METHODS section for

        more info.





-p::

-p::

--period::

--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-A being the weight of the data file

    - WEIGHT-B being the weight of the baseline 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

SEE ALSO

--------

--------

linkperf:perf-record[1], linkperf:perf-report[1]
 
linkperf:perf-record[1], linkperf:perf-report[1]