diff options
| author | Carsten Emde <C.Emde@osadl.org> | 2010-02-15 22:30:36 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2010-02-18 17:04:40 +0100 |
| commit | 16e4137caa24b5117724cab121151df013c66c3c (patch) | |
| tree | f2ff78f23c889ffa58bcc2cab0c6fb8b555e614b | |
| parent | 75df1a475db51b411a4b624d0e2111473627d8e1 (diff) | |
| download | lwn-16e4137caa24b5117724cab121151df013c66c3c.tar.gz lwn-16e4137caa24b5117724cab121151df013c66c3c.zip | |
tracing: Include zero offset in timer histogram
If everything works well and the CPU is pretty fast, most wakeup timers
have a delay of less than 1 us which is currently not recorded in the
missed_timer_offsets histograms.
It would, however, be preferable to even record such short offsets.
This patch modifies the code to also consider delays of 0 us in the
histogram.
Signed-off-by: Carsten Emde <C.Emde@osadl.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
| -rw-r--r-- | kernel/trace/latency_hist.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/trace/latency_hist.c b/kernel/trace/latency_hist.c index 1811038b02b2..b4dc1c2cd468 100644 --- a/kernel/trace/latency_hist.c +++ b/kernel/trace/latency_hist.c @@ -870,7 +870,7 @@ out: static notrace void probe_hrtimer_interrupt(int cpu, long long latency_ns, struct task_struct *curr, struct task_struct *task) { - if (latency_ns < 0 && task != NULL && rt_task(task) && + if (latency_ns <= 0 && task != NULL && rt_task(task) && task->prio < curr->prio) { unsigned long latency; |