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

[Ingo Molnar]

* Srivatsa Vaddagiri <vatsa@xxxxxxxxxx> 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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