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authorNamhyung Kim <namhyung@kernel.org>2016-08-31 05:55:29 +0300
committerSteven Rostedt <rostedt@goodmis.org>2016-09-01 19:19:40 +0300
commit8861dd303cba879bae9a9dcee74042fb642bf03b (patch)
tree9395c7c589d846cc94cbed3a960131fa15c72db4 /Documentation/trace
parent613dccdf681aed9f9d1243bb2b8cd864a887802f (diff)
downloadlinux-8861dd303cba879bae9a9dcee74042fb642bf03b.tar.xz
ftrace: Access ret_stack->subtime only in the function profiler
The subtime is used only for function profiler with function graph tracer enabled. Move the definition of subtime under CONFIG_FUNCTION_PROFILER to reduce the memory usage. Also move the initialization of subtime into the graph entry callback. Link: http://lkml.kernel.org/r/20160831025529.24018-1-namhyung@kernel.org Cc: Ingo Molnar <mingo@kernel.org> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: Namhyung Kim <namhyung@kernel.org> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'Documentation/trace')
-rw-r--r--Documentation/trace/ftrace.txt10
1 files changed, 5 insertions, 5 deletions
diff --git a/Documentation/trace/ftrace.txt b/Documentation/trace/ftrace.txt
index a6b3705e62a6..185c39fea2a0 100644
--- a/Documentation/trace/ftrace.txt
+++ b/Documentation/trace/ftrace.txt
@@ -858,11 +858,11 @@ x494] <- /root/a.out[+0x4a8] <- /lib/libc-2.7.so[+0x1e1a6]
When enabled, it will account time the task has been
scheduled out as part of the function call.
- graph-time - When running function graph tracer, to include the
- time to call nested functions. When this is not set,
- the time reported for the function will only include
- the time the function itself executed for, not the time
- for functions that it called.
+ graph-time - When running function profiler with function graph tracer,
+ to include the time to call nested functions. When this is
+ not set, the time reported for the function will only
+ include the time the function itself executed for, not the
+ time for functions that it called.
record-cmd - When any event or tracer is enabled, a hook is enabled
in the sched_switch trace point to fill comm cache