Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751425AbWBQOTJ (ORCPT ); Fri, 17 Feb 2006 09:19:09 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751436AbWBQOTJ (ORCPT ); Fri, 17 Feb 2006 09:19:09 -0500 Received: from holly.csn.ul.ie ([136.201.105.4]:26590 "EHLO holly.csn.ul.ie") by vger.kernel.org with ESMTP id S1751425AbWBQOS6 (ORCPT ); Fri, 17 Feb 2006 09:18:58 -0500 From: Mel Gorman To: linux-mm@kvack.org Cc: Mel Gorman , linux-kernel@vger.kernel.org, lhms-devel@lists.sourceforge.net Message-Id: <20060217141752.7621.68392.sendpatchset@skynet.csn.ul.ie> In-Reply-To: <20060217141552.7621.74444.sendpatchset@skynet.csn.ul.ie> References: <20060217141552.7621.74444.sendpatchset@skynet.csn.ul.ie> Subject: [PATCH 6/7] Allow HugeTLB allocations to use ZONE_EASYRCLM Date: Fri, 17 Feb 2006 14:17:52 +0000 (GMT) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2695 Lines: 53 On ppc64 at least, a HugeTLB is the same size as a memory section. Hence, it causes no fragmentation that is worth caring about because a section can still be offlined. Once HugeTLB is allowed to use ZONE_EASYRCLM, the size of the zone becomes a "soft" area where HugeTLB allocations may be satisified. For example, take a situation where a system administrator is not willing to reserve HugeTLB pages at boot time. In this case, he can use kernelcore to size the EasyRclm zone which is still usable by normal processes. If a job starts that need HugeTLB pages, one could dd a file the size of physical memory, delete it and have a good chance of getting a number of HugeTLB pages. To get all of EasyRclm as HugeTLB pages, the ability to drain per-cpu pages is required. Signed-off-by: Mel Gorman diff -rup -X /usr/src/patchset-0.5/bin//dontdiff linux-2.6.16-rc3-mm1-106_zonechoose/mm/hugetlb.c linux-2.6.16-rc3-mm1-107_hugetlb_use_easyrclm/mm/hugetlb.c --- linux-2.6.16-rc3-mm1-106_zonechoose/mm/hugetlb.c 2006-02-16 09:50:44.000000000 +0000 +++ linux-2.6.16-rc3-mm1-107_hugetlb_use_easyrclm/mm/hugetlb.c 2006-02-17 09:44:58.000000000 +0000 @@ -49,7 +49,7 @@ static struct page *dequeue_huge_page(st for (z = zonelist->zones; *z; z++) { nid = (*z)->zone_pgdat->node_id; - if (cpuset_zone_allowed(*z, GFP_HIGHUSER) && + if (cpuset_zone_allowed(*z, GFP_RCLMUSER) && !list_empty(&hugepage_freelists[nid])) break; } @@ -68,7 +68,7 @@ static int alloc_fresh_huge_page(void) { static int nid = 0; struct page *page; - page = alloc_pages_node(nid, GFP_HIGHUSER|__GFP_COMP|__GFP_NOWARN, + page = alloc_pages_node(nid, GFP_RCLMUSER|__GFP_COMP|__GFP_NOWARN, HUGETLB_PAGE_ORDER); nid = (nid + 1) % num_online_nodes(); if (page) { diff -rup -X /usr/src/patchset-0.5/bin//dontdiff linux-2.6.16-rc3-mm1-106_zonechoose/mm/mempolicy.c linux-2.6.16-rc3-mm1-107_hugetlb_use_easyrclm/mm/mempolicy.c --- linux-2.6.16-rc3-mm1-106_zonechoose/mm/mempolicy.c 2006-02-16 09:50:44.000000000 +0000 +++ linux-2.6.16-rc3-mm1-107_hugetlb_use_easyrclm/mm/mempolicy.c 2006-02-17 09:44:58.000000000 +0000 @@ -1201,7 +1201,7 @@ struct zonelist *huge_zonelist(struct vm unsigned nid; nid = interleave_nid(pol, vma, addr, HPAGE_SHIFT); - return NODE_DATA(nid)->node_zonelists + gfp_zone(GFP_HIGHUSER); + return NODE_DATA(nid)->node_zonelists + gfp_zone(GFP_RCLMUSER); } return zonelist_policy(GFP_HIGHUSER, pol); } - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/