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| author | Waiman Long <Waiman.Long@hp.com> | 2013-10-18 10:38:49 -0400 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2013-10-21 17:36:25 -0300 |
| commit | 5dbb6e81d85e55ee2b4cf523c1738e16f63e5400 (patch) | |
| tree | 334d7cd3884dde1e7f9d35e0be561f82edc92ccf /tools/perf/Documentation | |
| parent | 91e95617429cb272fd908b1928a1915b37b9655f (diff) | |
| download | op-kernel-dev-5dbb6e81d85e55ee2b4cf523c1738e16f63e5400.zip op-kernel-dev-5dbb6e81d85e55ee2b4cf523c1738e16f63e5400.tar.gz | |
perf top: Add --max-stack option to limit callchain stack scan
When the callgraph function is enabled (-G), it may take a long time to
scan all the stack data and merge them accordingly.
This patch adds a new --max-stack option to perf-top to limit the depth
of callchain stack data to look at to reduce the time it takes for
perf-top to finish its processing. It reduces the amount of information
provided to the user in exchange for faster speed.
Signed-off-by: Waiman Long <Waiman.Long@hp.com>
Acked-by: David Ahern <dsahern@gmail.com>
Tested-by: Davidlohr Bueso <davidlohr@hp.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Aswin Chandramouleeswaran <aswin@hp.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Scott J Norton <scott.norton@hp.com>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1382107129-2010-5-git-send-email-Waiman.Long@hp.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/Documentation')
| -rw-r--r-- | tools/perf/Documentation/perf-top.txt | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-top.txt b/tools/perf/Documentation/perf-top.txt index f65777c..c16a09e 100644 --- a/tools/perf/Documentation/perf-top.txt +++ b/tools/perf/Documentation/perf-top.txt @@ -158,6 +158,14 @@ Default is to monitor all CPUS. Default: fractal,0.5,callee. +--max-stack:: + Set the stack depth limit when parsing the callchain, anything + beyond the specified depth will be ignored. This is a trade-off + between information loss and faster processing especially for + workloads that can have a very long callchain stack. + + Default: 127 + --ignore-callees=<regex>:: Ignore callees of the function(s) matching the given regex. This has the effect of collecting the callers of each such |
