From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Thu, 10 Nov 2005 15:27:12 -0800 (PST) From: Christoph Lameter Subject: [PATCH] dequeue a huge page near to this node Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org Return-Path: To: Adam Litke Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, kenneth.w.chen@intel.com, akpm@osdl.org List-ID: The following patch changes the dequeueing to select a huge page near the node executing instead of always beginning to check for free nodes from node 0. This will result in a placement of the huge pages near the executing processor improving performance. The existing implementation can place the huge pages far away from the executing processor causing significant degradation of performance. The search starting from zero also means that the lower zones quickly run out of memory. Selecting a huge page near the process distributed the huge pages better. Signed-off-by: Christoph Lameter Index: linux-2.6.14-mm1/mm/hugetlb.c =================================================================== --- linux-2.6.14-mm1.orig/mm/hugetlb.c 2005-11-09 10:47:37.000000000 -0800 +++ linux-2.6.14-mm1/mm/hugetlb.c 2005-11-10 15:02:05.000000000 -0800 @@ -36,14 +36,16 @@ static struct page *dequeue_huge_page(vo { int nid = numa_node_id(); struct page *page = NULL; + struct zonelist *zonelist = NODE_DATA(nid)->node_zonelists; + struct zone **z; - if (list_empty(&hugepage_freelists[nid])) { - for (nid = 0; nid < MAX_NUMNODES; ++nid) - if (!list_empty(&hugepage_freelists[nid])) - break; + for (z = zonelist->zones; *z; z++) { + nid = (*z)->zone_pgdat->node_id; + if (!list_empty(&hugepage_freelists[nid])) + break; } - if (nid >= 0 && nid < MAX_NUMNODES && - !list_empty(&hugepage_freelists[nid])) { + + if (z) { page = list_entry(hugepage_freelists[nid].next, struct page, lru); list_del(&page->lru); -- 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