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

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Message-ID: <20141014173837.GA8919@node.dhcp.inet.fi>
Date:	Tue, 14 Oct 2014 20:38:37 +0300
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Alex Thorlton <athorlton@....com>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Ingo Molnar <mingo@...nel.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Hugh Dickins <hughd@...gle.com>, Bob Liu <lliubbo@...il.com>,
	Johannes Weiner <hannes@...xchg.org>, linux-mm@...ck.org
Subject: Re: [BUG] mm, thp: khugepaged can't allocate on requested node when
 confined to a cpuset

On Tue, Oct 14, 2014 at 04:54:35PM +0200, Peter Zijlstra wrote:
> > Is there a reason why we should respect cpuset limitation for kernel
> > threads?
> 
> Yes, because we want to allow isolating CPUs from 'random' activity.

Okay, it makes sense for cpus_allowed. But we're talking about
mems_allowed, right?
 
> 
> > Should we bypass cpuset for PF_KTHREAD completely?
> 
> No. That'll break stuff.

Like what?

-- 
 Kirill A. Shutemov
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