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Date: Thu, 26 Mar 2015 06:16:22 +0900 From: Gioh Kim <gioh.kim@....com> To: Mel Gorman <mgorman@...e.de> CC: akpm@...ux-foundation.org, riel@...hat.com, hannes@...xchg.org, rientjes@...gle.com, vdavydov@...allels.com, iamjoonsoo.kim@....com, linux-mm@...ck.org, linux-kernel@...r.kernel.org, gunho.lee@....com Subject: Re: [RFCv2] mm: page allocation for less fragmentation 2015-03-25 오후 7:56에 Mel Gorman 이(가) 쓴 글: > 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? It's not related to CMA and MOVABLE zone. It's for compaction and anti-fragmentation for any zone. > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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