From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-oi0-f72.google.com (mail-oi0-f72.google.com [209.85.218.72]) by kanga.kvack.org (Postfix) with ESMTP id 1F1C66B0005 for ; Thu, 21 Jul 2016 22:59:27 -0400 (EDT) Received: by mail-oi0-f72.google.com with SMTP id u142so174947671oia.2 for ; Thu, 21 Jul 2016 19:59:27 -0700 (PDT) Received: from szxga03-in.huawei.com ([119.145.14.66]) by mx.google.com with ESMTPS id m77si8285635iod.118.2016.07.21.19.59.25 for (version=TLS1 cipher=AES128-SHA bits=128/128); Thu, 21 Jul 2016 19:59:26 -0700 (PDT) Message-ID: <57918BAC.8000008@huawei.com> Date: Fri, 22 Jul 2016 10:57:48 +0800 From: Xishi Qiu MIME-Version: 1.0 Subject: [PATCH v2] mem-hotplug: alloc new page from the next node if zone is MOVABLE_ZONE 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: Linux MM , LKML Memory offline could happen on both movable zone and non-movable zone. We can offline the whole node if the zone is movable zone, and if the zone is non-movable zone, we cannot offline the whole node, because some kernel memory can't be migrated. So if we offline a node with movable zone, use prefer mempolicy to alloc new page from the next 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. Signed-off-by: Xishi Qiu --- mm/memory_hotplug.c | 35 +++++++++++++++++++++++++++++------ 1 file changed, 29 insertions(+), 6 deletions(-) diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index e3cbdca..930a5c6 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -1501,6 +1501,16 @@ 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 node, + int **result) +{ + if (PageHuge(page)) + return alloc_huge_page_node(page_hstate(compound_head(page)), + node); + else + return __alloc_pages_node(node, GFP_HIGHUSER_MOVABLE, 0); +} + #define NR_OFFLINE_AT_ONCE_PAGES (256) static int do_migrate_range(unsigned long start_pfn, unsigned long end_pfn) @@ -1510,6 +1520,7 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn) int move_pages = NR_OFFLINE_AT_ONCE_PAGES; int not_managed = 0; int ret = 0; + int nid = NUMA_NO_NODE; LIST_HEAD(source); for (pfn = start_pfn; pfn < end_pfn && move_pages > 0; pfn++) { @@ -1564,12 +1575,24 @@ 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, - MIGRATE_SYNC, MR_MEMORY_HOTPLUG); + for (pfn = start_pfn; pfn < end_pfn; pfn++) { + if (!pfn_valid(pfn)) + continue; + page = pfn_to_page(pfn); + if (zone_idx(page_zone(page)) == ZONE_MOVABLE) + nid = next_node_in(page_to_nid(page), + node_online_map); + break; + } + + /* Alloc new page from the next node if possible */ + if (nid != NUMA_NO_NODE) + ret = migrate_pages(&source, new_node_page, NULL, + nid, MIGRATE_SYNC, MR_MEMORY_HOTPLUG); + else + ret = migrate_pages(&source, alloc_migrate_target, 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