From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ob0-f198.google.com (mail-ob0-f198.google.com [209.85.214.198]) by kanga.kvack.org (Postfix) with ESMTP id E865E6B007E for ; Tue, 14 Jun 2016 22:00:08 -0400 (EDT) Received: by mail-ob0-f198.google.com with SMTP id f10so6917158obr.3 for ; Tue, 14 Jun 2016 19:00:08 -0700 (PDT) Received: from szxga01-in.huawei.com (szxga01-in.huawei.com. [58.251.152.64]) by mx.google.com with ESMTPS id 1si8678540itz.48.2016.06.14.19.00.06 for (version=TLS1 cipher=AES128-SHA bits=128/128); Tue, 14 Jun 2016 19:00:08 -0700 (PDT) From: Subject: [PATCH v2] more mapcount page as kpage could reduce total replacement times than fewer mapcount one in probability. Date: Wed, 15 Jun 2016 09:56:58 +0800 Message-ID: <1465955818-101898-1-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 | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/mm/ksm.c b/mm/ksm.c index 4786b41..4d530af 100644 --- a/mm/ksm.c +++ b/mm/ksm.c @@ -1094,6 +1094,14 @@ 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)) { + swap(page, tree_page); + swap(rmap_item, tree_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