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SubjectRe: Preempt Threshold Measurements
Date
Andrew Morton writes:

> Con Kolivas <kernel@kolivas.org> wrote:
>> Certainly the do_munmap and exit_mmap seem to be repeat offenders on my
>> machine too (more the latter in my case).
>>
>
> This is a false positive. Nothing is setting need_resched(), so
> unmap_vmas() doesn't bother dropping the lock.

Ok well excluding do_munmap and exit_mmap the ones that have shown up
(some more frequently than others) are:

6ms at ksoftirqd+0x6b
2ms at sys_ioctl+0x47
2ms at b44_open
6ms at fget+0x28
2ms at write_ordered_buffers+0x37
4ms at blkdev_put+0x48
5ms at add_wait_queue+0x21
4ms at blkdev_put+0x48

and you were right; eventually the reiserfs ones showed up again at 6-8ms

Now which of the above are not false positives and should I try to extract
the exact locations of them?

Con

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