linux-kernel - Re: [PATCH 1/2] mem-hotplug: use GFP_HIGHUSER_MOVABLE in, alloc_migrate

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Date:	Mon, 18 Jul 2016 09:45:20 +0200
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Xishi Qiu <qiuxishi@...wei.com>
Cc:	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Linux MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] mem-hotplug: use GFP_HIGHUSER_MOVABLE in,
 alloc_migrate_target()

On 07/18/2016 07:51 AM, Joonsoo Kim wrote:
> On Fri, Jul 15, 2016 at 10:47:06AM +0800, Xishi Qiu wrote:
>> alloc_migrate_target() is called from migrate_pages(), and the page
>> is always from user space, so we can add __GFP_HIGHMEM directly.
>
> No, all migratable pages are not from user space. For example,
> blockdev file cache has __GFP_MOVABLE and migratable but it has no
> __GFP_HIGHMEM and __GFP_USER.
>
> And, zram's memory isn't GFP_HIGHUSER_MOVABLE but has __GFP_MOVABLE.

Right, and there's also Minchan's series for arbitrary driver page 
migration...

> Thanks.
>