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Date:	Tue, 14 Oct 2014 16:54:35 +0200
From:	Peter Zijlstra <>
To:	"Kirill A. Shutemov" <>
Cc:	Alex Thorlton <>,,
	Andrew Morton <>,
	Mel Gorman <>, Rik van Riel <>,
	Ingo Molnar <>,
	"Kirill A. Shutemov" <>,
	Hugh Dickins <>, Bob Liu <>,
	Johannes Weiner <>,
Subject: Re: [BUG] mm, thp: khugepaged can't allocate on requested node when
 confined to a cpuset

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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