* Jeff Dike <[email protected]> wrote:
> On Thu, Nov 29, 2007 at 11:19:40AM +0100, Miklos Szeredi wrote:
> > date-7119 0.... 15636591us!: schedule <bash-502> (0 0)
> > bash-502 0.... 15643908us!: schedule <date-7119> (0 0)
> > bash-502 0.... 15646250us!: schedule <date-7120> (0 0)
>
> How exactly did you end up getting this data?
>
> And is there something I can read to tell what it means?
the header of /proc/latency_trace explains the format:
_------=> CPU#
/ _-----=> irqs-off
| / _----=> need-resched
|| / _---=> hardirq/softirq
||| / _--=> preempt-depth
|||| /
||||| delay
cmd pid ||||| time | caller
\ / ||||| \ | /
privoxy-12926 1.Ns1 0us : ktime_get_ts (ktime_get)
'time' is timestamp in microseconds. Then come the caller (and parent,
or other, special parameters like the task-pid of the scheduled task).
It's supposed to be easy to read to kernel hackers - let me know if any
of the details is non-obvious.
for example:
> > date-7119 0.... 15636591us!: schedule <bash-502> (0 0)
the task 'date' (pid 7119) scheduled at timestamp 15636591us, and
switched to another task 'bash' (pid 502). Both had a default nice level
of 0 [the (0 0) arguments].
Ingo
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