Re: [PATCH V2 1/2] mm: hotplug: implement non-movable version ofget_user_pages() called get_user_pages_non_movable()

[Mel Gorman]

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@xxxxxxxxxxxxxxxxxxxx>
> Cc: Mel Gorman <mgorman@xxxxxxx>
> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
> Cc: Yasuaki Ishimatsu <isimatu.yasuaki@xxxxxxxxxxxxxx>
> Cc: Jeff Moyer <jmoyer@xxxxxxxxxx>
> Cc: Minchan Kim <minchan@xxxxxxxxxx>
> Cc: Zach Brown <zab@xxxxxxxxxx>
> Reviewed-by: Tang Chen <tangchen@xxxxxxxxxxxxxx>
> Reviewed-by: Gu Zheng <guz.fnst@xxxxxxxxxxxxxx>
> Signed-off-by: Lin Feng <linfeng@xxxxxxxxxxxxxx>

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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