Messages in this thread | | | Date | Mon, 02 Dec 2013 11:33:06 +0200 | From | Pekka Enberg <> | Subject | Re: [PATCH 1/2] perf sched: Introduce timehist command - v2 |
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On 12/02/2013 02:23 AM, David Ahern wrote: > 'perf sched timehist' provides an analysis of scheduling events. > > Example usage: > perf sched record -- sleep 1 > perf sched timehist > > By default it shows the individual schedule events, including the time between > sched-in events for the task, the task scheduling delay (time between wakeup > and actually running) and run time for the task: > > time cpu task name[tid/pid] b/n time sch delay run time > ------------- ---- -------------------- --------- --------- --------- > 79371.874569 [11] gcc[31949] 0.014 0.000 1.148 > 79371.874591 [10] gcc[31951] 0.000 0.000 0.024 > 79371.874603 [10] migration/10[59] 3.350 0.004 0.011 > 79371.874604 [11] <idle> 1.148 0.000 0.035 > 79371.874723 [05] <idle> 0.016 0.000 1.383 > 79371.874746 [05] gcc[31949] 0.153 0.078 0.022
What does "b/n time" mean?
I'm seeing rather large "sch delay" numbers on Fedora 19's default kernel that seem like a data error of some sort:
4500.663117 [02] fix_client[7216] 0.007 18446744073708.033 1.786
Scheduling delays don't seem to be part of "-s" summary output. Why?
Pekka
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