Messages in this thread | | | Date | Wed, 25 Mar 2015 10:56:40 +0000 | From | Mel Gorman <> | Subject | Re: [RFCv2] mm: page allocation for less fragmentation |
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On Wed, Mar 25, 2015 at 11:39:15AM +0900, Gioh Kim wrote: > My driver allocates more than 40MB pages via alloc_page() at a time and > maps them at virtual address. Totally it uses 300~400MB pages. > > If I run a heavy load test for a few days in 1GB memory system, I cannot allocate even order=3 pages > because-of the external fragmentation. > > I thought I needed a anti-fragmentation solution for my driver. > But there is no allocation function that considers fragmentation. > The compaction is not helpful because it is only for movable pages, not unmovable pages. > > This patch proposes a allocation function allocates only pages in the same pageblock. >
Is this not what CMA is for? Or creating a MOVABLE zone?
-- Mel Gorman SUSE Labs
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