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perf config: Document variables for 'report' section in man page

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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>
This commit is contained in:
Taeung Song 2016-02-04 18:25:08 +09:00 committed by Arnaldo Carvalho de Melo
parent 56c94dc56f
commit 806cb95bb6
1 changed files with 36 additions and 0 deletions
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36
tools/perf/Documentation/perf-config.txt
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@ -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]