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Open Source and information security mailing list archives
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Date: Wed, 14 Nov 2012 13:00:52 -0500 From: Rik van Riel <riel@...hat.com> To: Mel Gorman <mgorman@...e.de> CC: Peter Zijlstra <a.p.zijlstra@...llo.nl>, Andrea Arcangeli <aarcange@...hat.com>, Ingo Molnar <mingo@...nel.org>, Johannes Weiner <hannes@...xchg.org>, Hugh Dickins <hughd@...gle.com>, Thomas Gleixner <tglx@...utronix.de>, Linus Torvalds <torvalds@...ux-foundation.org>, Andrew Morton <akpm@...ux-foundation.org>, Linux-MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org> Subject: Re: [PATCH 17/31] mm: numa: Avoid double faulting after migrating misplaced page On 11/13/2012 06:12 AM, Mel Gorman wrote: > The pte_same check after a misplaced page is successfully migrated will > never succeed and force a double fault to fix it up as pointed out by Rik > van Riel. This was the "safe" option but it's expensive. > > This patch uses the migration allocation callback to record the location > of the newly migrated page. If the page is the same when the PTE lock is > reacquired it is assumed that it is safe to complete the pte_numa fault > without incurring a double fault. > > Signed-off-by: Mel Gorman <mgorman@...e.de> Reviewed-by: Rik van Riel <riel@...hat.com> -- All rights reversed -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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