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| author | Namhyung Kim <namhyung@kernel.org> | 2016-08-31 11:55:29 +0900 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2016-09-01 12:19:40 -0400 |
| commit | 8861dd303cba879bae9a9dcee74042fb642bf03b (patch) | |
| tree | 9395c7c589d846cc94cbed3a960131fa15c72db4 /Documentation/trace | |
| parent | 613dccdf681aed9f9d1243bb2b8cd864a887802f (diff) | |
| download | linux-8861dd303cba879bae9a9dcee74042fb642bf03b.tar.gz linux-8861dd303cba879bae9a9dcee74042fb642bf03b.tar.bz2 linux-8861dd303cba879bae9a9dcee74042fb642bf03b.zip | |
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.txt | 10 |
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 |