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-rw-r--r--tools/perf/Documentation/perf-config.txt12
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diff --git a/tools/perf/Documentation/perf-config.txt b/tools/perf/Documentation/perf-config.txt
index 9365b75fd04f..5b4fff3adc4b 100644
--- a/tools/perf/Documentation/perf-config.txt
+++ b/tools/perf/Documentation/perf-config.txt
@@ -498,6 +498,18 @@ record.*::
But if this option is 'no-cache', it will not update the build-id cache.
'skip' skips post-processing and does not update the cache.
+diff.*::
+ diff.order::
+ This option sets the number of columns to sort the result.
+ The default is 0, which means sorting by baseline.
+ Setting it to 1 will sort the result by delta (or other
+ compute method selected).
+
+ diff.compute::
+ This options sets the method for computing the diff result.
+ Possible values are 'delta', 'delta-abs', 'ratio' and
+ 'wdiff'. Default is 'delta'.
+
SEE ALSO
--------
linkperf:perf[1]