Commit-ID: be6f164a02f394675e2ac2077dd354cebef5b4c0
Gitweb: http://git.kernel.org/tip/be6f164a02f394675e2ac2077dd354cebef5b4c0
Author: Steven Rostedt <srostedt@xxxxxxxxxx>
AuthorDate: Tue, 24 Mar 2009 11:06:24 -0400
Committer: Steven Rostedt <srostedt@xxxxxxxxxx>
CommitDate: Tue, 24 Mar 2009 11:06:24 -0400
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@xxxxxxxxxx>
---
kernel/trace/ftrace.c | 7 +++++++
kernel/trace/trace.c | 3 ++-
kernel/trace/trace.h | 1 +
3 files changed, 10 insertions(+), 1 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;
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index f0e1337..67c6a21 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -255,7 +255,7 @@ static DECLARE_WAIT_QUEUE_HEAD(trace_wait);
/* trace_flags holds trace_options default values */
unsigned long trace_flags = TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK |
- TRACE_ITER_ANNOTATE | TRACE_ITER_CONTEXT_INFO;
+ TRACE_ITER_ANNOTATE | TRACE_ITER_CONTEXT_INFO | TRACE_ITER_SLEEP_TIME;
/**
* trace_wake_up - wake up tasks waiting for trace input
@@ -316,6 +316,7 @@ static const char *trace_options[] = {
"context-info",
"latency-format",
"global-clock",
+ "sleep-time",
NULL
};
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 7cfb741..d7410bb 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -683,6 +683,7 @@ enum trace_iterator_flags {
TRACE_ITER_CONTEXT_INFO = 0x20000, /* Print pid/cpu/time */
TRACE_ITER_LATENCY_FMT = 0x40000,
TRACE_ITER_GLOBAL_CLK = 0x80000,
+ TRACE_ITER_SLEEP_TIME = 0x100000,
};
/*
--
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