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Date: Tue, 1 Jul 2008 18:58:38 +0100 From: Andy Whitcroft <apw@...dowen.org> To: linux-mm@...ck.org Cc: linux-kernel@...r.kernel.org, Mel Gorman <mel@....ul.ie>, Andy Whitcroft <apw@...dowen.org> Subject: [RFC PATCH 0/4] Reclaim page capture v1 For sometime we have been looking at mechanisms for improving the availability of larger allocations under load. One of the options we have explored is the capturing of pages freed under direct reclaim in order to increase the chances of free pages coelescing before they are subject to reallocation by racing allocators. Following this email is a patch stack implementing page capture during direct reclaim. It consits of four patches. The first two simply pull out existing code into helpers for reuse. The third makes buddy's use of struct page explicit. The fourth contains the meat of the changes, and its leader contains a much fuller description of the feature. I have done a fair amount of comparitive testing with and without this patch set and in broad brush I am seeing improvements in hugepage allocations (worst case size) success of the order of 5% which under load for systems with larger hugepages represents a doubling of the number of pages available. Testing is still ongoing to confirm these results. Against: 2.6.26-rc6 (with the explicit page flags patches) Comments? -apw -- 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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