Re: [BUG] mm, thp: khugepaged can't allocate on requested node when confined to a cpuset

[Peter Zijlstra]

On Tue, Oct 14, 2014 at 02:48:28PM +0300, Kirill A. Shutemov wrote:

> Why whould you want to pin khugpeaged? Is there a valid use-case?
> Looks like userspace shoots to its leg.

Its just bad design to put so much work in another context. But the
use-case is isolating other cpus.

> Is there a reason why we should respect cpuset limitation for kernel
> threads?

Yes, because we want to allow isolating CPUs from 'random' activity.

> Should we bypass cpuset for PF_KTHREAD completely?

No. That'll break stuff.
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