linux-kernel - Re: [RFC 13/16] mm/cma: populate ZONE_CMA and use this zone when GFP

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Message-ID: <54DED6D8.7080609@lge.com>
Date:	Sat, 14 Feb 2015 14:02:16 +0900
From:	Gioh Kim <gioh.kim@....com>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Mel Gorman <mgorman@...e.de>,
	Laura Abbott <lauraa@...eaurora.org>,
	Minchan Kim <minchan@...nel.org>,
	Heesub Shin <heesub.shin@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Hui Zhu <zhuhui@...omi.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Ritesh Harjani <ritesh.list@...il.com>,
	Vlastimil Babka <vbabka@...e.cz>
Subject: Re: [RFC 13/16] mm/cma: populate ZONE_CMA and use this zone when
 GFP_HIGHUSERMOVABLE



2015-02-12 ПРШФ 4:32ПЁ Joonsoo Kim РЬ(АЁ) ОД Бл:
> Until now, reserved pages for CMA are managed altogether with normal
> page in the same zone. This approach has numorous problems and fixing
> them isn't easy. To fix this situation, ZONE_CMA is introduced in
> previous patch, but, not yet populated. This patch implement population
> of ZONE_CMA by stealing reserved pages from normal zones. This stealing
> break one uncertain assumption on zone, that is, zone isn't overlapped.
> In the early of this series, some check is inserted to every zone's span
> iterator to handle zone overlap so there would be no problem with
> this assumption break.
> 
> To utilize this zone, user should use GFP_HIGHUSERMOVABLE, because

I think it might be typo of GFP_HIGHUSER_MOVABLE.

> these pages are only applicable for movable type and ZONE_CMA could
> contain highmem.
> 
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