From mboxrd@z Thu Jan 1 00:00:00 1970 Message-Id: <20070806103658.107883000@chello.nl> References: <20070806102922.907530000@chello.nl> Date: Mon, 06 Aug 2007 12:29:24 +0200 From: Peter Zijlstra Subject: [PATCH 02/10] mm: system wide ALLOC_NO_WATERMARK Content-Disposition: inline; filename=global-ALLOC_NO_WATERMARKS.patch Sender: owner-linux-mm@kvack.org Return-Path: To: linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: Peter Zijlstra , David Miller , Andrew Morton , Daniel Phillips , Pekka Enberg , Christoph Lameter , Matt Mackall , Lee Schermerhorn , Steve Dickson List-ID: Change ALLOC_NO_WATERMARK page allocation such that dipping into the reserves becomes a system wide event. This has the advantage that logic dealing with reserve pages need not be node aware (when we're this low on memory speed is usually not an issue). Signed-off-by: Peter Zijlstra Cc: Lee Schermerhorn Cc: Christoph Lameter --- mm/page_alloc.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) Index: linux-2.6-2/mm/page_alloc.c =================================================================== --- linux-2.6-2.orig/mm/page_alloc.c +++ linux-2.6-2/mm/page_alloc.c @@ -1311,6 +1311,21 @@ restart: rebalance: if (alloc_flags & ALLOC_NO_WATERMARKS) { nofail_alloc: + /* + * break out of mempolicy boundaries + */ + zonelist = NODE_DATA(numa_node_id())->node_zonelists + + gfp_zone(gfp_mask); + + /* + * Before going bare metal, try to get a page above the + * critical threshold - ignoring CPU sets. + */ + page = get_page_from_freelist(gfp_mask, order, zonelist, + ALLOC_WMARK_MIN|ALLOC_HIGH|ALLOC_HARDER); + if (page) + goto got_pg; + /* go through the zonelist yet again, ignoring mins */ page = get_page_from_freelist(gfp_mask, order, zonelist, ALLOC_NO_WATERMARKS); -- -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org