linux-kernel - Re: [PATCH V2 1/2] mm: hotplug: implement non-movable version of get_user_pages() called get_user_pages_non

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Date:	Tue, 5 Feb 2013 12:01:37 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Lin Feng <linfeng@...fujitsu.com>
Cc:	akpm@...ux-foundation.org, bcrl@...ck.org, viro@...iv.linux.org.uk,
	khlebnikov@...nvz.org, walken@...gle.com,
	kamezawa.hiroyu@...fujitsu.com, minchan@...nel.org,
	riel@...hat.com, rientjes@...gle.com,
	isimatu.yasuaki@...fujitsu.com, wency@...fujitsu.com,
	laijs@...fujitsu.com, jiang.liu@...wei.com, zab@...hat.com,
	jmoyer@...hat.com, linux-mm@...ck.org, linux-aio@...ck.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 1/2] mm: hotplug: implement non-movable version of
 get_user_pages() called get_user_pages_non_movable()

On Tue, Feb 05, 2013 at 05:21:52PM +0800, Lin Feng wrote:
> get_user_pages() always tries to allocate pages from movable zone, which is not
>  reliable to memory hotremove framework in some case.
> 
> This patch introduces a new library function called get_user_pages_non_movable()
>  to pin pages only from zone non-movable in memory.
> It's a wrapper of get_user_pages() but it makes sure that all pages come from
> non-movable zone via additional page migration.
> 
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Mel Gorman <mgorman@...e.de>
> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> Cc: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
> Cc: Jeff Moyer <jmoyer@...hat.com>
> Cc: Minchan Kim <minchan@...nel.org>
> Cc: Zach Brown <zab@...hat.com>
> Reviewed-by: Tang Chen <tangchen@...fujitsu.com>
> Reviewed-by: Gu Zheng <guz.fnst@...fujitsu.com>
> Signed-off-by: Lin Feng <linfeng@...fujitsu.com>

I already had started the review of V1 before this was sent
unfortunately. However, I think the feedback I gave for V1 is still
valid so I'll wait for comments on that review before digging further.

-- 
Mel Gorman
SUSE Labs
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