[PATCH v10 08/22] perf config: Document 'hist.percentage' variable in man page

[Taeung Song]

Explain 'hist.percentage' variable.

Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Signed-off-by: Taeung Song <treeze.taeung@xxxxxxxxx>
---
 tools/perf/Documentation/perf-config.txt | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/tools/perf/Documentation/perf-config.txt b/tools/perf/Documentation/perf-config.txt
index e47be25..b04c2bc 100644
--- a/tools/perf/Documentation/perf-config.txt
+++ b/tools/perf/Documentation/perf-config.txt
@@ -263,6 +263,23 @@ help.*::
 		<perf sub-command> can be record, script, report or inject
 		    or: perf-with-kcore fix_buildid_cache_permissions
 
+hist.*::
+	hist.percentage::
+		This option control a way to calcurate overhead of filtered entries -
+		that means the value of this option is effective only if there's a
+		filter (by comm, dso or symbol name).  Suppose a following example:
+
+		       Overhead  Symbols
+		       ........  .......
+		        33.33%     foo
+		        33.33%     bar
+		        33.33%     baz
+
+	       This is an original overhead and we'll filter out the first 'foo'
+	       entry.  The value of 'relative' would increase the overhead of 'bar'
+	       and 'baz' to 50.00% for each, while 'absolute' would show their
+	       current overhead (33.33%).
+
 SEE ALSO
 --------
 linkperf:perf[1]
-- 
1.9.1

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