From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-io0-f199.google.com (mail-io0-f199.google.com [209.85.223.199]) by kanga.kvack.org (Postfix) with ESMTP id CB3FA6B0253 for ; Mon, 25 Jul 2016 14:36:25 -0400 (EDT) Received: by mail-io0-f199.google.com with SMTP id q83so462887442iod.2 for ; Mon, 25 Jul 2016 11:36:25 -0700 (PDT) Received: from dfwrgout.huawei.com (dfwrgout.huawei.com. [206.16.17.72]) by mx.google.com with ESMTPS id e66si11984758otb.286.2016.07.25.11.36.23 for (version=TLS1 cipher=AES128-SHA bits=128/128); Mon, 25 Jul 2016 11:36:25 -0700 (PDT) Message-ID: <5795E18B.5060302@huawei.com> Date: Mon, 25 Jul 2016 17:53:15 +0800 From: Xishi Qiu MIME-Version: 1.0 Subject: [PATCH v3] mem-hotplug: alloc new page from a nearest neighbor node when mem-offline Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Joonsoo Kim , Vlastimil Babka , Andrew Morton , Naoya Horiguchi , David Rientjes Cc: LKML , Linux MM If we offline a node, alloc the new page from a nearest neighbor node instead of the current node or other remote nodes, because re-migrate is a waste of time and the distance of the remote nodes is often very large. Also use GFP_HIGHUSER_MOVABLE to alloc new page if the zone is movable zone or highmem zone. Changelog: V3: -alloc new page from a nearest neighbor node for both movable zone and non-movable zone V2: -alloc new page from the next node for only movable zone Signed-off-by: Xishi Qiu --- mm/memory_hotplug.c | 38 +++++++++++++++++++++++++++++++++----- 1 file changed, 33 insertions(+), 5 deletions(-) diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index e3cbdca..04dcf0e 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -1501,6 +1501,37 @@ static unsigned long scan_movable_pages(unsigned long start, unsigned long end) return 0; } +static struct page *new_node_page(struct page *page, unsigned long private, + int **result) +{ + gfp_t gfp_mask = GFP_USER | __GFP_MOVABLE; + int nid = page_to_nid(page); + nodemask_t nmask = node_online_map; + struct page *new_page; + + /* + * TODO: allocate a destination hugepage from a nearest neighbor node, + * accordance with memory policy of the user process if possible. For + * now as a simple work-around, we use the next node for destination. + */ + if (PageHuge(page)) + return alloc_huge_page_node(page_hstate(compound_head(page)), + next_node_in(nid, nmask)); + + node_clear(nid, nmask); + if (PageHighMem(page) + || (zone_idx(page_zone(page)) == ZONE_MOVABLE)) + gfp_mask |= __GFP_HIGHMEM; + + new_page = __alloc_pages_nodemask(gfp_mask, 0, + node_zonelist(nid, gfp_mask), &nmask); + if (!new_page) + new_page = __alloc_pages(gfp_mask, 0, + node_zonelist(nid, gfp_mask)); + + return new_page; +} + #define NR_OFFLINE_AT_ONCE_PAGES (256) static int do_migrate_range(unsigned long start_pfn, unsigned long end_pfn) @@ -1564,11 +1595,8 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn) goto out; } - /* - * alloc_migrate_target should be improooooved!! - * migrate_pages returns # of failed pages. - */ - ret = migrate_pages(&source, alloc_migrate_target, NULL, 0, + /* Allocate a new page from the nearest neighbor node */ + ret = migrate_pages(&source, new_node_page, NULL, 0, MIGRATE_SYNC, MR_MEMORY_HOTPLUG); if (ret) putback_movable_pages(&source); -- 1.8.3.1 -- 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