From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752322AbcFNJUl (ORCPT ); Tue, 14 Jun 2016 05:20:41 -0400 Received: from szxga01-in.huawei.com ([58.251.152.64]:32625 "EHLO szxga01-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752035AbcFNJUj (ORCPT ); Tue, 14 Jun 2016 05:20:39 -0400 From: To: CC: , , , , , , , , , , Subject: [PATCH] more mapcount page as kpage could reduce total replacement times than fewer mapcount one in probability. Date: Tue, 14 Jun 2016 17:17:37 +0800 Message-ID: <1465895857-1515-1-git-send-email-zhouxianrong@huawei.com> X-Mailer: git-send-email 1.7.9.5 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.143.155.56] X-CFilter-Loop: Reflected X-Mirapoint-Virus-RAPID-Raw: score=unknown(0), refid=str=0001.0A020203.575FCC5C.00B5,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0, ip=0.0.0.0, so=2013-06-18 04:22:30, dmn=2013-03-21 17:37:32 X-Mirapoint-Loop-Id: 57fb6c35fb370d8d3875335ae92d0661 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: z00281421 more mapcount page as kpage could reduce total replacement times than fewer mapcount one when ksmd scan and replace among forked pages later. Signed-off-by: z00281421 --- mm/ksm.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/mm/ksm.c b/mm/ksm.c index 4786b41..17a238c 100644 --- a/mm/ksm.c +++ b/mm/ksm.c @@ -1094,6 +1094,21 @@ static struct page *try_to_merge_two_pages(struct rmap_item *rmap_item, { int err; + /* + * select more mapcount page as kpage + */ + if (page_mapcount(page) < page_mapcount(tree_page)) { + struct page *tmp_page; + struct rmap_item *tmp_rmap_item; + + tmp_page = page; + page = tree_page; + tree_page = tmp_page; + tmp_rmap_item = rmap_item; + rmap_item = tree_rmap_item; + tree_rmap_item = tmp_rmap_item; + } + err = try_to_merge_with_ksm_page(rmap_item, page, NULL); if (!err) { err = try_to_merge_with_ksm_page(tree_rmap_item, -- 1.7.9.5 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-lb0-f200.google.com (mail-lb0-f200.google.com [209.85.217.200]) by kanga.kvack.org (Postfix) with ESMTP id 01A8D6B0297 for ; Tue, 14 Jun 2016 05:21:38 -0400 (EDT) Received: by mail-lb0-f200.google.com with SMTP id na2so59845263lbb.1 for ; Tue, 14 Jun 2016 02:21:37 -0700 (PDT) Received: from szxga01-in.huawei.com (szxga01-in.huawei.com. [58.251.152.64]) by mx.google.com with ESMTPS id z10si33775339wjj.209.2016.06.14.02.20.46 for (version=TLS1 cipher=AES128-SHA bits=128/128); Tue, 14 Jun 2016 02:21:36 -0700 (PDT) From: Subject: [PATCH] more mapcount page as kpage could reduce total replacement times than fewer mapcount one in probability. Date: Tue, 14 Jun 2016 17:17:37 +0800 Message-ID: <1465895857-1515-1-git-send-email-zhouxianrong@huawei.com> MIME-Version: 1.0 Content-Type: text/plain Sender: owner-linux-mm@kvack.org List-ID: To: linux-mm@kvack.org Cc: akpm@linux-foundation.org, hughd@google.com, aarcange@redhat.com, kirill.shutemov@linux.intel.com, dave.hansen@linux.intel.com, zhouchengming1@huawei.com, geliangtang@163.com, zhouxianrong@huawei.com, linux-kernel@vger.kernel.org, zhouxiyu@huawei.com, wanghaijun5@huawei.com From: z00281421 more mapcount page as kpage could reduce total replacement times than fewer mapcount one when ksmd scan and replace among forked pages later. Signed-off-by: z00281421 --- mm/ksm.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/mm/ksm.c b/mm/ksm.c index 4786b41..17a238c 100644 --- a/mm/ksm.c +++ b/mm/ksm.c @@ -1094,6 +1094,21 @@ static struct page *try_to_merge_two_pages(struct rmap_item *rmap_item, { int err; + /* + * select more mapcount page as kpage + */ + if (page_mapcount(page) < page_mapcount(tree_page)) { + struct page *tmp_page; + struct rmap_item *tmp_rmap_item; + + tmp_page = page; + page = tree_page; + tree_page = tmp_page; + tmp_rmap_item = rmap_item; + rmap_item = tree_rmap_item; + tree_rmap_item = tmp_rmap_item; + } + err = try_to_merge_with_ksm_page(rmap_item, page, NULL); if (!err) { err = try_to_merge_with_ksm_page(tree_rmap_item, -- 1.7.9.5 -- 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