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SubjectRe: Preempt Threshold Measurements
Con Kolivas <kernel@kolivas.org> wrote:
>
> Gabriel Devenyi writes:
>
> > Well I'm not particularly educated in kernel internals yet, here's some
> > reports from the system when its running.
> >
> > 6ms non-preemptible critical section violated 4 ms preempt threshold starting
> > at do_munmap+0xd2/0x140 and ending at do_munmap+0xeb/0x140
>
> 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.

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