perf diff: Report noisy for cycles diff

[linux-2.6-microblaze.git] / tools / perf / Documentation / perf-diff.txt

diff --git a/tools/perf/Documentation/perf-diff.txt b/tools/perf/Documentation/perf-diff.txt
index d5cc15e..f50ca0f 100644 (file)
--- a/tools/perf/Documentation/perf-diff.txt
+++ b/tools/perf/Documentation/perf-diff.txt
@@ -95,6 +95,11 @@ OPTIONS
         diff.compute config option.  See COMPARISON METHODS section for
         more info.
 
+--cycles-hist::
+       Report a histogram and the standard deviation for cycles data.
+       It can help us to judge if the reported cycles data is noisy or
+       not. This option should be used with '-c cycles'.
+
 -p::
 --period::
         Show period values for both compared hist entries.