From patchwork Sun Jan 26 10:26:22 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wei Yang X-Patchwork-Id: 11351809 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 34E7C159A for ; Sun, 26 Jan 2020 10:27:29 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 0C142214AF for ; Sun, 26 Jan 2020 10:27:29 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0C142214AF Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id B70006B0008; Sun, 26 Jan 2020 05:27:25 -0500 (EST) Delivered-To: linux-mm-outgoing@kvack.org Received: by kanga.kvack.org (Postfix, from userid 40) id B221B6B000A; Sun, 26 Jan 2020 05:27:25 -0500 (EST) X-Original-To: int-list-linux-mm@kvack.org X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A359C6B000C; Sun, 26 Jan 2020 05:27:25 -0500 (EST) X-Original-To: linux-mm@kvack.org X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0222.hostedemail.com [216.40.44.222]) by kanga.kvack.org (Postfix) with ESMTP id 9125F6B0008 for ; Sun, 26 Jan 2020 05:27:25 -0500 (EST) Received: from smtpin22.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with SMTP id 360022C34 for ; Sun, 26 Jan 2020 10:27:25 +0000 (UTC) X-FDA: 76419408450.22.pin55_40b337c842113 X-Spam-Summary: 1,0,0,,d41d8cd98f00b204,richardw.yang@linux.intel.com,:akpm@linux-foundation.org:mhocko@suse.com:yang.shi@linux.alibaba.com:rientjes@google.com::linux-kernel@vger.kernel.org:richardw.yang@linux.intel.com,RULES_HIT:30046:30054:30070,0,RBL:192.55.52.43:@linux.intel.com:.lbl8.mailshell.net-62.18.0.100 64.95.201.95,CacheIP:none,Bayesian:0.5,0.5,0.5,Netcheck:none,DomainCache:0,MSF:not bulk,SPF:fn,MSBL:0,DNSBL:neutral,Custom_rules:0:0:0,LFtime:2,LUA_SUMMARY:none X-HE-Tag: pin55_40b337c842113 X-Filterd-Recvd-Size: 2550 Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by imf11.hostedemail.com (Postfix) with ESMTP for ; Sun, 26 Jan 2020 10:27:24 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga105.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 26 Jan 2020 02:27:23 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.70,365,1574150400"; d="scan'208";a="223002741" Received: from richard.sh.intel.com (HELO localhost) ([10.239.159.54]) by fmsmga008.fm.intel.com with ESMTP; 26 Jan 2020 02:27:21 -0800 From: Wei Yang To: akpm@linux-foundation.org Cc: mhocko@suse.com, yang.shi@linux.alibaba.com, rientjes@google.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Wei Yang Subject: [Patch v3 3/4] mm/migrate.c: check pagelist in move_pages_and_store_status() Date: Sun, 26 Jan 2020 18:26:22 +0800 Message-Id: <20200126102623.9616-4-richardw.yang@linux.intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200126102623.9616-1-richardw.yang@linux.intel.com> References: <20200126102623.9616-1-richardw.yang@linux.intel.com> X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: When pagelist is empty, it is not necessary to do the move and store. Also it consolidate the empty list check in one place. Signed-off-by: Wei Yang Acked-by: Michal Hocko --- mm/migrate.c | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-) diff --git a/mm/migrate.c b/mm/migrate.c index e816c8990296..b123ced445b7 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -1499,9 +1499,6 @@ static int do_move_pages_to_node(struct mm_struct *mm, { int err; - if (list_empty(pagelist)) - return 0; - err = migrate_pages(pagelist, alloc_new_node_page, NULL, node, MIGRATE_SYNC, MR_SYSCALL); if (err) @@ -1589,6 +1586,9 @@ static int move_pages_and_store_status(struct mm_struct *mm, int node, { int err; + if (list_empty(pagelist)) + return 0; + err = do_move_pages_to_node(mm, pagelist, node); if (err) { /* @@ -1687,9 +1687,6 @@ static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes, current_node = NUMA_NO_NODE; } out_flush: - if (list_empty(&pagelist)) - return err; - /* Make sure we do not overwrite the existing error */ err1 = move_pages_and_store_status(mm, current_node, &pagelist, status, nr_pages, start, i);