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Message-Id: <20101118114928.ecb2d6b0.akpm@linux-foundation.org> Date: Thu, 18 Nov 2010 11:49:28 -0800 From: Andrew Morton <akpm@...ux-foundation.org> To: Mel Gorman <mel@....ul.ie> Cc: Johannes Weiner <hannes@...xchg.org>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>, Andrea Arcangeli <aarcange@...hat.com>, KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>, Rik van Riel <riel@...hat.com>, linux-mm@...ck.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 0/8] Use memory compaction instead of lumpy reclaim during high-order allocations On Thu, 18 Nov 2010 09:20:44 +0000 Mel Gorman <mel@....ul.ie> wrote: > > It's because migration depends on MMU. But we should be able to make > > a NOMMU version of migration that just does page cache, which is all > > that is reclaimable on NOMMU anyway. > > > > Conceivably, but I see little problem leaving them with lumpy reclaim. I see a really big problem: we'll need to maintain lumpy reclaim for ever! We keep on piling in more and more stuff, we're getting less sure that the old stuff is still effective. It's becoming more and more important to move some of our attention over to simplification, and to rejustification of earlier decisions. -- 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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