diff options
author | Steven Rostedt <srostedt@redhat.com> | 2009-03-24 15:06:24 (GMT) |
---|---|---|
committer | Steven Rostedt <srostedt@redhat.com> | 2009-03-24 15:06:24 (GMT) |
commit | be6f164a02f394675e2ac2077dd354cebef5b4c0 (patch) | |
tree | 9805294731c00ddb61857a4e1e42019058eb1542 /kernel/trace/ftrace.c | |
parent | 8aef2d2856158a36c295a8d1288281e4839bff13 (diff) | |
download | linux-fsl-qoriq-be6f164a02f394675e2ac2077dd354cebef5b4c0.tar.xz |
function-graph: add option for include sleep times
Impact: give user a choice to show times spent while sleeping
The user may want to see the time a function spent sleeping.
This patch adds the trace option "sleep-time" to allow that.
The "sleep-time" option is default on.
echo sleep-time > /debug/tracing/trace_options
produces:
------------------------------------------
2) avahi-d-3428 => <idle>-0
------------------------------------------
2) | finish_task_switch() {
2) 0.621 us | _spin_unlock_irq();
2) 2.202 us | }
2) ! 1002.197 us | }
2) ! 1003.521 us | }
where as,
echo nosleep-time > /debug/tracing/trace_options
produces:
0) <idle>-0 => yum-upd-3416
------------------------------------------
0) | finish_task_switch() {
0) 0.643 us | _spin_unlock_irq();
0) 2.342 us | }
0) + 41.302 us | }
0) + 42.453 us | }
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Diffstat (limited to 'kernel/trace/ftrace.c')
-rw-r--r-- | kernel/trace/ftrace.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 0b90364..02d2de9 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -2599,6 +2599,13 @@ ftrace_graph_probe_sched_switch(struct rq *__rq, struct task_struct *prev, unsigned long long timestamp; int index; + /* + * Does the user want to count the time a function was asleep. + * If so, do not update the time stamps. + */ + if (trace_flags & TRACE_ITER_SLEEP_TIME) + return; + timestamp = trace_clock_local(); prev->ftrace_timestamp = timestamp; |