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

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Message-ID: <20141021101742.GT23531@worktop.programming.kicks-ass.net>
Date:	Tue, 21 Oct 2014 12:17:42 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
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 08:38:37PM +0300, Kirill A. Shutemov wrote:
> 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?

Like using cpusets for what they were designed for? We very much want to
allow moving kernel threads into limited cpusets in order to avoid
perturbing the 'important' work done elsewhere.
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