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authorSteven Rostedt <srostedt@redhat.com>2009-03-24 11:06:24 -0400
committerSteven Rostedt <srostedt@redhat.com>2009-03-24 11:06:24 -0400
commitbe6f164a02f394675e2ac2077dd354cebef5b4c0 (patch)
tree9805294731c00ddb61857a4e1e42019058eb1542 /kernel/trace/ftrace.c
parent8aef2d2856158a36c295a8d1288281e4839bff13 (diff)
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.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 0b90364d1a2c..02d2de9d08ba 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,
2599 unsigned long long timestamp; 2599 unsigned long long timestamp;
2600 int index; 2600 int index;
2601 2601
2602 /*
2603 * Does the user want to count the time a function was asleep.
2604 * If so, do not update the time stamps.
2605 */
2606 if (trace_flags & TRACE_ITER_SLEEP_TIME)
2607 return;
2608
2602 timestamp = trace_clock_local(); 2609 timestamp = trace_clock_local();
2603 2610
2604 prev->ftrace_timestamp = timestamp; 2611 prev->ftrace_timestamp = timestamp;