perf trace: Exclude the kernel part of the callchain leading to a syscall

[deliverable/linux.git] / tools / perf / Documentation / perf-trace.txt

diff --git a/tools/perf/Documentation/perf-trace.txt b/tools/perf/Documentation/perf-trace.txt
index 13293de8869fe932c9610f3a3c5612c838a65bc4..1bbcf305d233132ad90cdc1a057250edbb904052 100644 (file)
--- a/tools/perf/Documentation/perf-trace.txt
+++ b/tools/perf/Documentation/perf-trace.txt
@@ -117,6 +117,15 @@ the thread executes on the designated CPUs. Default is to monitor all CPUs.
 --syscalls::
        Trace system calls. This options is enabled by default.
 
+--call-graph [mode,type,min[,limit],order[,key][,branch]]::
+        Setup and enable call-graph (stack chain/backtrace) recording.
+        See `--call-graph` section in perf-record and perf-report
+        man pages for details. The ones that are most useful in 'perf trace'
+        are 'dwarf' and 'lbr', where available, try: 'perf trace --call-graph dwarf'.
+
+--kernel-syscall-graph::
+        Show the kernel callchains on the syscall exit path.
+
 --event::
        Trace other events, see 'perf list' for a complete list.