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SubjectRe: [RFC] Cpu-hotplug: Using the Process Freezer (try2)

* Srivatsa Vaddagiri <vatsa@in.ibm.com> wrote:

> > Rafael has already sent out the fix for that, but for some reason I
> > don't see it in the -mm.
> >
> > With that fix, freezer and hence hotplug succeeds even when I am
> > running a 'make -j' test.

nice!

> Good to know that!
>
> So Ingo/Rafael, should we ignore the problem of "TASK_UNINTERRUPTIBLE
> sleepers can break freezer" for the timebeing? Mainly because its not
> trivial to solve and we need to tackle it case by case basis as and
> when users report specific problems.

yeah, i think you are right - and the TASK_UNINTERRUPTIBLE thing is not
only quite complex, it also breaks the symmetry of freezer use
(sw-suspend obviously cannot freeze uninterruptible tasks). We should
watch whether the current latency of freezing is good enough in
practice.

Ingo
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