linux-kernel - Re: [PATCH 5/7] mm/page_alloc: separate interface to set/get migratetype of freepage

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <xa1tbnzlbjjr.fsf@mina86.com>
Date:	Thu, 09 Jan 2014 10:18:00 +0100
From:	Michal Nazarewicz <mina86@...a86.com>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Rik van Riel <riel@...hat.com>,
	Jiang Liu <jiang.liu@...wei.com>, Mel Gorman <mgorman@...e.de>,
	Cody P Schafer <cody@...ux.vnet.ibm.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Michal Hocko <mhocko@...e.cz>,
	Minchan Kim <minchan@...nel.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Wei Yongjun <yongjun_wei@...ndmicro.com.cn>,
	Tang Chen <tangchen@...fujitsu.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Joonsoo Kim <js1304@...il.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH 5/7] mm/page_alloc: separate interface to set/get migratetype of freepage

On Thu, Jan 09 2014, Joonsoo Kim wrote:
> Currently, we use (set/get)_freepage_migratetype in two use cases.
> One is to know the buddy list where this page will be linked and
> the other is to know the buddy list where this page is linked now.
>
> But, we should deal these two use cases differently, because information
> isn't sufficient for the second use case and properly setting this
> information needs some overhead. Whenever the page is merged or split
> in buddy, this information isn't properly re-assigned and it may not
> have enough information for the second use case.
>
> This patch just separates interface, so there is no functional change.
> Following patch will do further steps about this issue.
>
> Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>

Acked-by: Michal Nazarewicz <mina86@...a86.com>

I think this patch would be smaller if it was pushed earlier in the
patchset.

-- 
Best regards,                                         _     _
.o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
..o | Computer Science,  Michał “mina86” Nazarewicz    (o o)
ooo +--<mpn@...gle.com>--<xmpp:mina86@...ber.org>--ooO--(_)--Ooo--


Download attachment "signature.asc" of type "application/pgp-signature" (836 bytes)