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

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Message-ID: <20141021105934.GV23531@worktop.programming.kicks-ass.net>
Date:	Tue, 21 Oct 2014 12:59:34 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vlastimil Babka <vbabka@...e.cz>
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 Fri, Oct 10, 2014 at 11:57:09PM +0200, Vlastimil Babka wrote:
> Hm I haven't seen the code yet, but is perhaps the NUMA scanning working
> similarly enough that a single scanner could handle both the NUMA and THP
> bits to save time?

IIRC the THP thing doesn't need the fault thing, which makes it an
entirely different beast. Then again, we do walk the actual page-tables
through change_protection, but changing that means we have to duplicate
all that code, then again, maybe the current THP stuff already carries
something like that.


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