Re: [RFC PATCH 2/3 V1] mm, page migrate: add MIGRATE_HOTREMOVE type

[Mel Gorman]

On Wed, Jul 04, 2012 at 03:26:17PM +0800, Lai Jiangshan wrote:
> MIGRATE_HOTREMOVE is a special kind of MIGRATE_MOVABLE, but it is stable:
> any page of the type can NOT be changed to the other type nor be moved to
> the other free list.
> 
> So the pages of MIGRATE_HOTREMOVE are always movable, this ability is
> useful for hugepages and hotremove ...etc.
> 
> MIGRATE_HOTREMOVE pages is the used as the first candidate when
> we allocate movable pages.
> 
> 1) add small routine is_migrate_movable() for movable-like types
> 2) add small routine is_migrate_stable() for stable types
> 3) fix some comments
> 4) fix get_any_page(). The get_any_page() may change
>    MIGRATE_CMA/HOTREMOVE types page to MOVABLE which may cause this page
>    to be changed to UNMOVABLE.
> 

Reuse MIGRATE_CMA. Even if the pages are on the movable lists it should
not be a problem for memory hot-remove.

-- 
Mel Gorman
SUSE Labs
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