Messages in this thread |  | | | Date | Wed, 04 Jul 2012 18:50:26 +0800 | | From | Lai Jiangshan <> | | Subject | Re: [RFC PATCH 2/3 V1] mm, page migrate: add MIGRATE_HOTREMOVE type |
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On 07/04/2012 06:19 PM, Mel Gorman wrote: > 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.
Will do it.
> Even if the pages are on the movable lists it should > not be a problem for memory hot-remove.
It does have problem, unmovable pages may be allocated on it.
The movable lists can be used for other type when ohter type is empty. Or we can rename current movable-lists to movable-preference-lists.
Thanks, Lai
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