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-rw-r--r--tools/perf/Documentation/perf-diff.txt8
1 files changed, 8 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-diff.txt b/tools/perf/Documentation/perf-diff.txt
index e463caa3eb49..d1deb573877f 100644
--- a/tools/perf/Documentation/perf-diff.txt
+++ b/tools/perf/Documentation/perf-diff.txt
@@ -20,12 +20,20 @@ If no parameters are passed it will assume perf.data.old and perf.data.
The differential profile is displayed only for events matching both
specified perf.data files.
+If no parameters are passed the samples will be sorted by dso and symbol.
+As the perf.data files could come from different binaries, the symbols addresses
+could vary. So perf diff is based on the comparison of the files and
+symbols name.
+
OPTIONS
-------
-D::
--dump-raw-trace::
Dump raw trace in ASCII.
+--kallsyms=<file>::
+ kallsyms pathname
+
-m::
--modules::
Load module symbols. WARNING: use only with -k and LIVE kernel