linux-kernel - Re: [PATCH 01/10] migrate: add migrate_entry_wait

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Date:	Sat, 23 Mar 2013 11:55:17 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
CC:	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>, Hugh Dickins <hughd@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andi Kleen <andi@...stfloor.org>,
	Hillf Danton <dhillf@...il.com>, Michal Hocko <mhocko@...e.cz>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/10] migrate: add migrate_entry_wait_huge()

On 03/22/2013 04:23 PM, Naoya Horiguchi wrote:
> When we have a page fault for the address which is backed by a hugepage
> under migration, the kernel can't wait correctly until the migration
> finishes. This is because pte_offset_map_lock() can't get a correct
> migration entry for hugepage. This patch adds migration_entry_wait_huge()
> to separate code path between normal pages and hugepages.
>
> ChangeLog v2:
>   - remove dup in migrate_entry_wait_huge()
>
> Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>

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

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