linux-kernel - Re: [PATCH 10/63] mm: Do not flush TLB during protection change if !pte_present && !migration

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Message-ID: <5252CF5A.4000003@redhat.com>
Date:	Mon, 07 Oct 2013 11:12:26 -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 10/63] mm: Do not flush TLB during protection change if
 !pte_present && !migration_entry

On 10/07/2013 06:28 AM, Mel Gorman wrote:
> NUMA PTE scanning is expensive both in terms of the scanning itself and
> the TLB flush if there are any updates. Currently non-present PTEs are
> accounted for as an update and incurring a TLB flush where it is only
> necessary for anonymous migration entries. This patch addresses the
> problem and should reduce TLB flushes.
> 
> Signed-off-by: Mel Gorman <mgorman@...e.de>

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

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