From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6D87CC2BA2B for ; Wed, 15 Apr 2020 21:44:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3E1392076C for ; Wed, 15 Apr 2020 21:44:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586987084; bh=d70WE9UrG3WG2ng9rKQE35xkTHOeB3Njfu1omBSNyRo=; h=Date:From:To:Cc:Subject:In-Reply-To:References:List-ID:From; b=aZWoEHCuNnah+EozfoxAKI6ia0uC6FMWcm3/ieY2SIiF5EJA51pgSvWJAcl1emI77 GGrOCBaVvWKLenuzvxNnf+1SOKqM1X1Xk3xGMmJdjO3osQnlAh+bpEvgyBdLbJ0N9X PRDKL/60ZFv1kdb1oUfTB1yVZAjvGPAIA+iIm1BE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730631AbgDOVok (ORCPT ); Wed, 15 Apr 2020 17:44:40 -0400 Received: from mail.kernel.org ([198.145.29.99]:42132 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730409AbgDOVo3 (ORCPT ); Wed, 15 Apr 2020 17:44:29 -0400 Received: from localhost.localdomain (c-73-231-172-41.hsd1.ca.comcast.net [73.231.172.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id DAF8B2076C; Wed, 15 Apr 2020 21:44:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586987067; bh=d70WE9UrG3WG2ng9rKQE35xkTHOeB3Njfu1omBSNyRo=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=vv6K5mdGmd/tAm9iNBNZO+qoEN/QyNrfO/tcJVi+jO+e318ZSnVlh3a7LaFjvzYxP Hg0aPElrm+JCbdWq9R49xgZt3N/ZJfgz4jszW8zlBcfl9JX5+PTRhhlNi01fwNO20+ IfqccJ45QkqnX+0Zgl3VuuM/GdgPGCoa+e6ZkelU= Date: Wed, 15 Apr 2020 14:44:26 -0700 From: Andrew Morton To: "Kirill A. Shutemov" Cc: Andrea Arcangeli , Zi Yan , Yang Shi , Ralph Campbell , John Hubbard , William Kucharski , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCHv3, RESEND 6/8] khugepaged: Allow to collapse PTE-mapped compound pages Message-Id: <20200415144426.a146ef173140f5bc396a6dcd@linux-foundation.org> In-Reply-To: <20200413125220.663-7-kirill.shutemov@linux.intel.com> References: <20200413125220.663-1-kirill.shutemov@linux.intel.com> <20200413125220.663-7-kirill.shutemov@linux.intel.com> X-Mailer: Sylpheed 3.5.1 (GTK+ 2.24.31; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 13 Apr 2020 15:52:18 +0300 "Kirill A. Shutemov" wrote: > We can collapse PTE-mapped compound pages. We only need to avoid > handling them more than once: lock/unlock page only once if it's present > in the PMD range multiple times as it handled on compound level. The > same goes for LRU isolation and putback. > > ... > > --- a/mm/khugepaged.c > +++ b/mm/khugepaged.c > @@ -515,17 +515,30 @@ void __khugepaged_exit(struct mm_struct *mm) > > static void release_pte_page(struct page *page) > { > - dec_node_page_state(page, NR_ISOLATED_ANON + page_is_file_cache(page)); I have dec_node_page_state(page, NR_ISOLATED_ANON + page_is_file_lru(page)); here. Is there some prerequisite which I wasn't able to find?