Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754741Ab3IXXhn (ORCPT ); Tue, 24 Sep 2013 19:37:43 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:37992 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753996Ab3IXXhm (ORCPT ); Tue, 24 Sep 2013 19:37:42 -0400 Date: Tue, 24 Sep 2013 16:37:40 -0700 From: Andrew Morton To: "Kirill A. Shutemov" Cc: Andrea Arcangeli , Al Viro , Hugh Dickins , Wu Fengguang , Jan Kara , Mel Gorman , linux-mm@kvack.org, Andi Kleen , Matthew Wilcox , "Kirill A. Shutemov" , Hillf Danton , Dave Hansen , Ning Qu , Alexander Shishkin , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCHv6 00/22] Transparent huge page cache: phase 1, everything but mmap() Message-Id: <20130924163740.4bc7db61e3e520798220dc4c@linux-foundation.org> In-Reply-To: <1379937950-8411-1-git-send-email-kirill.shutemov@linux.intel.com> References: <1379937950-8411-1-git-send-email-kirill.shutemov@linux.intel.com> X-Mailer: Sylpheed 3.2.0beta5 (GTK+ 2.24.10; 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 List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1347 Lines: 40 On Mon, 23 Sep 2013 15:05:28 +0300 "Kirill A. Shutemov" wrote: > It brings thp support for ramfs, but without mmap() -- it will be posted > separately. We were never going to do this :( Has anyone reviewed these patches much yet? > Please review and consider applying. It appears rather too immature at this stage. > Intro > ----- > > The goal of the project is preparing kernel infrastructure to handle huge > pages in page cache. > > To proof that the proposed changes are functional we enable the feature > for the most simple file system -- ramfs. ramfs is not that useful by > itself, but it's good pilot project. At the very least we should get this done for a real filesystem to see how intrusive the changes are and to evaluate the performance changes. Sigh. A pox on whoever thought up huge pages. Words cannot express how much of a godawful mess they have made of Linux MM. And it hasn't ended yet :( My take is that we'd need to see some very attractive and convincing real-world performance numbers before even thinking of taking this on. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/