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-rw-r--r--tools/perf/Documentation/perf-trace.txt9
1 files changed, 9 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-trace.txt b/tools/perf/Documentation/perf-trace.txt
index 1bbcf305d233..2ee0c4fee18d 100644
--- a/tools/perf/Documentation/perf-trace.txt
+++ b/tools/perf/Documentation/perf-trace.txt
@@ -129,6 +129,15 @@ the thread executes on the designated CPUs. Default is to monitor all CPUs.
--event::
Trace other events, see 'perf list' for a complete list.
+--max-stack::
+ Set the stack depth limit when parsing the callchain, anything
+ beyond the specified depth will be ignored. Note that at this point
+ this is just about the presentation part, i.e. the kernel is still
+ not limiting, the overhead of callchains needs to be set via the
+ knobs in --call-graph dwarf.
+
+ Default: 127
+
--proc-map-timeout::
When processing pre-existing threads /proc/XXX/mmap, it may take a long time,
because the file may be huge. A time out is needed in such cases.