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Date: Tue, 16 Feb 2010 08:55:46 -0600 (CST) From: Christoph Lameter <cl@...ux-foundation.org> To: Mel Gorman <mel@....ul.ie> cc: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>, Andrea Arcangeli <aarcange@...hat.com>, Adam Litke <agl@...ibm.com>, Avi Kivity <avi@...hat.com>, David Rientjes <rientjes@...gle.com>, linux-kernel@...r.kernel.org, linux-mm@...ck.org Subject: Re: [PATCH 05/12] Memory compaction core On Tue, 16 Feb 2010, Mel Gorman wrote: > Because how do I tell in advance that the data I am migrating from DMA can > be safely relocated to the NORMAL zone? We don't save GFP flags. Granted, > for DMA, that will not matter as pages that must be in DMA will also not by > migratable. However, buffer pages should not get relocated to HIGHMEM for > example which is more likely to happen. It could be special cased but > I'm not aware of ZONE_DMA-related pressure problems that would make this > worthwhile and if so, it should be handled as a separate patch series. Oh there are numerous ZONE_DMA pressure issues if you have ancient / screwed up hardware that can only operate on DMA or DMA32 memory. Moving page cache pages out of the DMA zone would be good. A write request will cause the page to bounce back to the DMA zone if the device requires the page there. But I also think that the patchset should be as simple as possible so that it can be merged soon. > Ah, it was 2009 when I last kicked this around heavily :) I'll update > it. But it was authored in 2009. May be important if patent or other copyright claims arise. 2009-2010? -- 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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