From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pd0-f181.google.com (mail-pd0-f181.google.com [209.85.192.181]) by kanga.kvack.org (Postfix) with ESMTP id D6C3D6B0031 for ; Tue, 24 Sep 2013 19:37:44 -0400 (EDT) Received: by mail-pd0-f181.google.com with SMTP id g10so5280239pdj.12 for ; Tue, 24 Sep 2013 16:37:44 -0700 (PDT) Date: Tue, 24 Sep 2013 16:37:40 -0700 From: Andrew Morton 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> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: 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 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, 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