summaryrefslogtreecommitdiff
path: root/tools/perf/Documentation
diff options
context:
space:
mode:
authorTaeung Song <treeze.taeung@gmail.com>2016-02-04 18:25:08 +0900
committerArnaldo Carvalho de Melo <acme@redhat.com>2016-02-04 11:44:25 -0300
commit806cb95bb6cb25105b37d971d9916105898cb6fe (patch)
tree890327c9a40d1e625d042084814691d0e7da35a3 /tools/perf/Documentation
parent56c94dc56f9e4c1c09fbe26ad65715caa2259438 (diff)
downloadlinux-806cb95bb6cb25105b37d971d9916105898cb6fe.tar.gz
perf config: Document variables for 'report' section in man page
Explain 'report' section's variables: 'percent-limit', 'queue-size' and 'children'. Signed-off-by: Taeung Song <treeze.taeung@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Link: http://lkml.kernel.org/r/1454577913-16401-4-git-send-email-treeze.taeung@gmail.com [ Fix some grammar issues, add some more info ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/Documentation')
-rw-r--r--tools/perf/Documentation/perf-config.txt36
1 files changed, 36 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-config.txt b/tools/perf/Documentation/perf-config.txt
index 42310ae7e636..f38f46f67d74 100644
--- a/tools/perf/Documentation/perf-config.txt
+++ b/tools/perf/Documentation/perf-config.txt
@@ -369,6 +369,42 @@ call-graph.*::
This is a maximum number of lines of callchain printed for a single
histogram entry. Default is 0 which means no limitation.
+report.*::
+ report.percent-limit::
+ This one is mostly the same as call-graph.threshold but works for
+ histogram entries. Entries having an overhead lower than this
+ percentage will not be printed. Default is '0'. If percent-limit
+ is '10', only entries which have more than 10% of overhead will be
+ printed.
+
+ report.queue-size::
+ This option sets up the maximum allocation size of the internal
+ event queue for ordering events. Default is 0, meaning no limit.
+
+ report.children::
+ 'Children' means functions called from another function.
+ If this option is true, 'perf report' cumulates callchains of children
+ and show (accumulated) total overhead as well as 'Self' overhead.
+ Please refer to the 'perf report' manual. The default is 'true'.
+
+ report.group::
+ This option is to show event group information together.
+ Example output with this turned on, notice that there is one column
+ per event in the group, ref-cycles and cycles:
+
+ # group: {ref-cycles,cycles}
+ # ========
+ #
+ # Samples: 7K of event 'anon group { ref-cycles, cycles }'
+ # Event count (approx.): 6876107743
+ #
+ # Overhead Command Shared Object Symbol
+ # ................ ....... ................. ...................
+ #
+ 99.84% 99.76% noploop noploop [.] main
+ 0.07% 0.00% noploop ld-2.15.so [.] strcmp
+ 0.03% 0.00% noploop [kernel.kallsyms] [k] timerqueue_del
+
SEE ALSO
--------
linkperf:perf[1]