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=-4.5 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS, USER_AGENT_NEOMUTT autolearn=ham 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 9EC57C43441 for ; Fri, 23 Nov 2018 10:56:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5EEF620861 for ; Fri, 23 Nov 2018 10:56:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=shutemov-name.20150623.gappssmtp.com header.i=@shutemov-name.20150623.gappssmtp.com header.b="ILpd2c1M" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5EEF620861 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=shutemov.name Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2409537AbeKWVkh (ORCPT ); Fri, 23 Nov 2018 16:40:37 -0500 Received: from mail-pl1-f196.google.com ([209.85.214.196]:34436 "EHLO mail-pl1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2409278AbeKWVkg (ORCPT ); Fri, 23 Nov 2018 16:40:36 -0500 Received: by mail-pl1-f196.google.com with SMTP id f12-v6so10512568plo.1 for ; Fri, 23 Nov 2018 02:56:49 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=shutemov-name.20150623.gappssmtp.com; s=20150623; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=6qonCTkzBQK4cOvzBOuh9ggDqkZ8MLO+RjDax7u/Sj0=; b=ILpd2c1MfwgVXBMeTLFCl2sLE9dm6mEwsKJy+Z5yyA6BZS1b8Pb7SUk0FIlRMID50P e5+N0wM9BNvuBTp3A3k1UlLdTxmov/0TaDdz21kqPcF8SD3wk/3wBp9U1Qv4Z7RzoCVV 95FNQFOKpE5+9cOlGRmmRq5wa5s85WX1A8lj9zPc0Grkf+HyPJyJ/t8GR4VYlAs/QYJU wbxWRq53xGeyihdKa7jiHTWgqTCaQB8/LeG8uuyDZWtmUWmFzACr4pOLsckAcsTfGqSi fVD1NcM0vTgjbPp1vKkTADC85r8qobXaPSBHw3xP09/8enpTeXTgoPE6sLKvfLI365AV BGSA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=6qonCTkzBQK4cOvzBOuh9ggDqkZ8MLO+RjDax7u/Sj0=; b=I+5friu47RMa/ayJhG/6ZwQqMysco3hG6cd+XT79oBJMLMNqV5QemZpjTrg+Bk+Ig4 qG/rA9axzgG20ounkOyQjuPXGr4FHFPhibS488q41pXjYQSaUJURHBcMpm3LTOX3xfvR pwxK6nMovSZ71EnuwwSPhJO83ra9cyX7O1mPI2qAq8+ixxihJ8hZO8nwV0SsDPdLslmV 1eo9Q6HTfYbkmsC9l1N8iQ2kR5JGlHBADlsq1AzvCbZfVnhxS4VpxxeRlKhvLMu+VvRo d52m+UNSo/+qY/I+75S6a2n/wBmfTC4xLYyHIW/LQdBe3jjUmOBv421AWEWWz12K/kDl SdZg== X-Gm-Message-State: AA+aEWbLXkXrqvpNwOsyHPFtdjaHhx1ZPEqKcW/L6FzEm1MI3w0GhZZa 59ewYBO22RNdtOEnZHd1ygxOXA== X-Google-Smtp-Source: AFSGD/VPi+VaRiS+VL5iWJpsfsuZqDEDw4i06uYodlC0oszhxBMo5bQEwijTGt2/0E5sEgwPMqblXw== X-Received: by 2002:a17:902:7e44:: with SMTP id a4mr15166932pln.338.1542970608763; Fri, 23 Nov 2018 02:56:48 -0800 (PST) Received: from kshutemo-mobl1.localdomain ([192.55.54.40]) by smtp.gmail.com with ESMTPSA id k15sm7195065pfb.147.2018.11.23.02.56.47 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 23 Nov 2018 02:56:47 -0800 (PST) Received: by kshutemo-mobl1.localdomain (Postfix, from userid 1000) id 5BEA73001AF; Fri, 23 Nov 2018 13:56:44 +0300 (+03) Date: Fri, 23 Nov 2018 13:56:44 +0300 From: "Kirill A. Shutemov" To: Matthew Wilcox Cc: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" , Hugh Dickins Subject: Re: [PATCH 2/2] page cache: Store only head pages in i_pages Message-ID: <20181123105643.fxqk7l57rdurdubx@kshutemo-mobl1> References: <20181122213224.12793-1-willy@infradead.org> <20181122213224.12793-3-willy@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20181122213224.12793-3-willy@infradead.org> User-Agent: NeoMutt/20180716 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Nov 22, 2018 at 01:32:24PM -0800, Matthew Wilcox wrote: > Transparent Huge Pages are currently stored in i_pages as pointers to > consecutive subpages. This patch changes that to storing consecutive > pointers to the head page in preparation for storing huge pages more > efficiently in i_pages. I probably miss something, I don't see how it wouldn't break split_huge_page(). I don't see what would replace head pages in i_pages with formerly-tail-pages? Hm? -- Kirill A. Shutemov