Hi,
I tried to work on a patch for powertop to display the wakeups per process
so that I can distinguish between multiple running processes with the same
name (e.g. java). This would be useful if more than one process is running
with the same name, but the wakeups for one specific process are interesting
for debugging. However I have some trouble with the pid that is listed in
the timer_stats file in my case:
For example I have one java application running, which ps shows as having
pid "8313", however this pid is not showing up in /proc/timer_stats at all,
but rather a number of pids in the same range show up, but none of these map
to any running process and the one process that I am looking for does not
show up at all:
$ cat /proc/timer_stats | grep java
197, 8326 java hrtimer_start_range_ns (hrtimer_wakeup)
246, 8347 java hrtimer_start_range_ns (hrtimer_wakeup)
65, 8368 java hrtimer_start_range_ns (hrtimer_wakeup)
20, 8328 java hrtimer_start_range_ns (hrtimer_wakeup)
19, 8344 java hrtimer_start_range_ns (hrtimer_wakeup)
9, 8317 java hrtimer_start_range_ns (hrtimer_wakeup)
9, 8354 java hrtimer_start_range_ns (hrtimer_wakeup)
Anybody knows how this maps to the java process with pid "8313"? Is this
caused by internals of the java implementation? Or rather some effect of how
timer_stats are reported?
Kernel is 2.6.31 from Ubuntu plus TuxOnIce compiled for amd64
Linux distro is Ubuntu Karmic 9.10
Thanks... Dominik.
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