Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751997AbdFZD6c (ORCPT ); Sun, 25 Jun 2017 23:58:32 -0400 Received: from mail-pg0-f65.google.com ([74.125.83.65]:33245 "EHLO mail-pg0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751656AbdFZD62 (ORCPT ); Sun, 25 Jun 2017 23:58:28 -0400 From: Wei Yang To: akpm@linux-foundation.org, mhocko@suse.com, vbabka@suse.cz Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Wei Yang Subject: [PATCH] mm/memory_hotplug: just build zonelist for new added node Date: Mon, 26 Jun 2017 11:58:22 +0800 Message-Id: <20170626035822.50155-1-richard.weiyang@gmail.com> X-Mailer: git-send-email 2.11.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1396 Lines: 47 In commit (9adb62a5df9c0fbef7) "mm/hotplug: correctly setup fallback zonelists when creating new pgdat" tries to build the correct zonelist for a new added node, while it is not necessary to rebuild it for already exist nodes. In build_zonelists(), it will iterate on nodes with memory. For a new added node, it will have memory until node_states_set_node() is called in online_pages(). This patch will avoid to rebuild the zonelists for already exist nodes. Signed-off-by: Wei Yang --- mm/page_alloc.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 560eafe8234d..fc8181b44fd8 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -5200,15 +5200,17 @@ static int __build_all_zonelists(void *data) memset(node_load, 0, sizeof(node_load)); #endif - if (self && !node_online(self->node_id)) { + /* This node is hotadded and no memory preset yet. + * So just build zonelists is fine, no need to touch other nodes. + */ + if (self && !node_online(self->node_id)) build_zonelists(self); - } - - for_each_online_node(nid) { - pg_data_t *pgdat = NODE_DATA(nid); + else + for_each_online_node(nid) { + pg_data_t *pgdat = NODE_DATA(nid); - build_zonelists(pgdat); - } + build_zonelists(pgdat); + } /* * Initialize the boot_pagesets that are going to be used -- 2.11.0