From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755210AbdCGKhn (ORCPT ); Tue, 7 Mar 2017 05:37:43 -0500 Received: from szxga01-in.huawei.com ([45.249.212.187]:3829 "EHLO dggrg01-dlp.huawei.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1755090AbdCGKh3 (ORCPT ); Tue, 7 Mar 2017 05:37:29 -0500 Message-ID: <58BE8C91.20600@huawei.com> Date: Tue, 7 Mar 2017 18:33:53 +0800 From: Xishi Qiu User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:12.0) Gecko/20120428 Thunderbird/12.0.1 MIME-Version: 1.0 To: Andrew Morton , Vlastimil Babka , Mel Gorman , Minchan Kim , Michal Hocko , Joonsoo Kim CC: Yisheng Xie , Linux MM , LKML Subject: [RFC][PATCH 1/2] mm: use MIGRATE_HIGHATOMIC as late as possible Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.177.25.179] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020201.58BE8CA1.0019,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0, ip=0.0.0.0, so=2014-11-16 11:51:01, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 7c5776cd7066cffa2c20b89f2fae970a Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org MIGRATE_HIGHATOMIC page blocks are reserved for an atomic high-order allocation, so use it as late as possible. Signed-off-by: Xishi Qiu --- mm/page_alloc.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 40d79a6..2331840 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -2714,14 +2714,12 @@ struct page *rmqueue(struct zone *preferred_zone, spin_lock_irqsave(&zone->lock, flags); do { - page = NULL; - if (alloc_flags & ALLOC_HARDER) { + page = __rmqueue(zone, order, migratetype); + if (!page && alloc_flags & ALLOC_HARDER) { page = __rmqueue_smallest(zone, order, MIGRATE_HIGHATOMIC); if (page) trace_mm_page_alloc_zone_locked(page, order, migratetype); } - if (!page) - page = __rmqueue(zone, order, migratetype); } while (page && check_new_pages(page, order)); spin_unlock(&zone->lock); if (!page) -- 1.8.3.1