[tip:perf/core] perf config: Document 'hist.percentage' variable in man page

[tip-bot for Taeung Song]

Commit-ID:  485311d97863f2810646e17c8075be2992225f98
Gitweb:     http://git.kernel.org/tip/485311d97863f2810646e17c8075be2992225f98
Author:     Taeung Song <treeze.taeung@xxxxxxxxx>
AuthorDate: Fri, 8 Jan 2016 20:39:36 +0900
Committer:  Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Tue, 26 Jan 2016 11:52:48 -0300

perf config: Document 'hist.percentage' variable in man page

Explain 'hist.percentage' variable.

Signed-off-by: Taeung Song <treeze.taeung@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Link: http://lkml.kernel.org/r/1452253193-30502-7-git-send-email-treeze.taeung@xxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 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 cb7ca50..74589c6 100644
--- a/tools/perf/Documentation/perf-config.txt
+++ b/tools/perf/Documentation/perf-config.txt
@@ -279,6 +279,23 @@ annotate.*::
 
 		99.93 â      mov    %eax,%eax
 
+hist.*::
+	hist.percentage::
+		This option control the way to calculate 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]