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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
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')
-rw-r--r--kernel/trace/ftrace.c7
-rw-r--r--kernel/trace/trace.c3
-rw-r--r--kernel/trace/trace.h1
3 files changed, 10 insertions, 1 deletions
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 0b90364d1a2..02d2de9d08b 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 f0e1337b1eb..67c6a21dd42 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 7cfb741be20..d7410bbb9a8 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,
};
/*