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-rw-r--r--tools/perf/Documentation/perf-record.txt14
1 files changed, 13 insertions, 1 deletions
diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index e297b74471b8..ca0d3d9f4bac 100644
--- a/tools/perf/Documentation/perf-record.txt
+++ b/tools/perf/Documentation/perf-record.txt
@@ -90,8 +90,20 @@ OPTIONS
Number of mmap data pages. Must be a power of two.
-g::
+ Enables call-graph (stack chain/backtrace) recording.
+
--call-graph::
- Do call-graph (stack chain/backtrace) recording.
+ Setup and enable call-graph (stack chain/backtrace) recording,
+ implies -g.
+
+ Allows specifying "fp" (frame pointer) or "dwarf"
+ (DWARF's CFI - Call Frame Information) as the method to collect
+ the information used to show the call graphs.
+
+ In some systems, where binaries are build with gcc
+ --fomit-frame-pointer, using the "fp" method will produce bogus
+ call graphs, using "dwarf", if available (perf tools linked to
+ the libunwind library) should be used instead.
-q::
--quiet::