linux-kernel - Re: [PATCHv5 24/28] thp, mm: split_huge

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Message-ID: <555B40CC.9060009@suse.cz>
Date:	Tue, 19 May 2015 15:55:24 +0200
From:	Vlastimil Babka <vbabka@...e.cz>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Hugh Dickins <hughd@...gle.com>
CC:	Dave Hansen <dave.hansen@...el.com>, Mel Gorman <mgorman@...e.de>,
	Rik van Riel <riel@...hat.com>,
	Christoph Lameter <cl@...two.org>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Steve Capper <steve.capper@...aro.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	Jerome Marchand <jmarchan@...hat.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCHv5 24/28] thp, mm: split_huge_page(): caller need to lock
 page

On 04/23/2015 11:03 PM, Kirill A. Shutemov wrote:
> We're going to use migration entries instead of compound_lock() to
> stabilize page refcounts. Setup and remove migration entries require
> page to be locked.
>
> Some of split_huge_page() callers already have the page locked. Let's
> require everybody to lock the page before calling split_huge_page().
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Tested-by: Sasha Levin <sasha.levin@...cle.com>

Acked-by: Vlastimil Babka <vbabka@...e.cz>

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