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| author | Adrian Hunter <adrian.hunter@intel.com> | 2015-09-29 11:52:37 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2015-10-01 00:34:26 +0300 |
| commit | 40862a7b793945c7080d1566ca3dc6249f3c6354 (patch) | |
| tree | d06d9f4296703f5bfd22eba6d73ecab261c45330 | |
| parent | b7f9ff5654d53fa47e0b5ff20f834f3e7a611846 (diff) | |
| download | linux-40862a7b793945c7080d1566ca3dc6249f3c6354.tar.xz | |
perf report: Amend documentation about max_stack and synthesized callchains
The --max_stack option was added as an optimization to reduce processing time,
so people specifying --max-stack might get a increased processing time if
combined with synthesized callchains, but otherwise no real harm.
A warning about setting both --max_stack and the synthesized callchains max
depth seems like overkill. Amend the documentation.
Reported-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/r/560A5155.4060105@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
| -rw-r--r-- | tools/perf/Documentation/perf-report.txt | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-report.txt b/tools/perf/Documentation/perf-report.txt index b941d5e07e28..ce499035e6d8 100644 --- a/tools/perf/Documentation/perf-report.txt +++ b/tools/perf/Documentation/perf-report.txt @@ -205,6 +205,8 @@ OPTIONS 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. + Note that when using the --itrace option the synthesized callchain size + will override this value if the synthesized callchain size is bigger. Default: 127 |