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

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Date:	Tue, 19 Jul 2016 12:05:13 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Xishi Qiu <qiuxishi@...wei.com>
cc:	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Vlastimil Babka <vbabka@...e.cz>,
	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 Tue, 19 Jul 2016, Xishi Qiu wrote:

> Memory offline could happen on both movable zone and non-movable zone, and we
> can offline the whole node if the zone is movable_zone(the node only has one
> movable_zone), and if the zone is normal_zone, we cannot offline the whole node,
> because some kernel memory can't be migrated.
> 
> So how about change alloc_migrate_target() to alloc memory from the next node
> with GFP_HIGHUSER_MOVABLE, if the offline zone is movable_zone.
> 

I think sharing alloc_migrate_target as a migration callback may not be 
worth it; CMA and memory offline are distinct usecases and probably 
deserve their own callbacks.