linux-kernel - Re: [PATCH 12/63] mm: numa: Do not migrate or account for hinting faults on the zero page

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Message-ID: <5252EAFF.8040700@redhat.com>
Date:	Mon, 07 Oct 2013 13:10:23 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Mel Gorman <mgorman@...e.de>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...nel.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 12/63] mm: numa: Do not migrate or account for hinting
 faults on the zero page

On 10/07/2013 06:28 AM, Mel Gorman wrote:
> The zero page is not replicated between nodes and is often shared between
> processes. The data is read-only and likely to be cached in local CPUs
> if heavily accessed meaning that the remote memory access cost is less
> of a concern. This patch prevents trapping faults on the zero pages. For
> tasks using the zero page this will reduce the number of PTE updates,
> TLB flushes and hinting faults.
> 
> [peterz@...radead.org: Correct use of is_huge_zero_page]
> Signed-off-by: Mel Gorman <mgorman@...e.de>

Reviewed-by: Rik van Riel <riel@...hat.com>


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