Message-ID: <54DED6D8.7080609@lge.com>
Date: Sat, 14 Feb 2015 14:02:16 +0900
From: Gioh Kim <gioh.kim@lge.com>
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To: Joonsoo Kim <iamjoonsoo.kim@lge.com>,
        Andrew Morton <akpm@linux-foundation.org>
CC: Rik van Riel <riel@redhat.com>, Johannes Weiner <hannes@cmpxchg.org>,
        Mel Gorman <mgorman@suse.de>, Laura Abbott <lauraa@codeaurora.org>,
        Minchan Kim <minchan@kernel.org>,
        Heesub Shin <heesub.shin@samsung.com>,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        Michal Nazarewicz <mina86@mina86.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
        linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        Hui Zhu <zhuhui@xiaomi.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
        Ritesh Harjani <ritesh.list@gmail.com>,
        Vlastimil Babka <vbabka@suse.cz>
Subject: Re: [RFC 13/16] mm/cma: populate ZONE_CMA and use this zone when
 GFP_HIGHUSERMOVABLE
References: <1423726340-4084-1-git-send-email-iamjoonsoo.kim@lge.com> <1423726340-4084-14-git-send-email-iamjoonsoo.kim@lge.com>
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2015-02-12 ???? 4:32?? Joonsoo Kim ??(??) ?? ??:
> 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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