Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757884Ab0FBNAn (ORCPT ); Wed, 2 Jun 2010 09:00:43 -0400 Received: from mail2.shareable.org ([80.68.89.115]:39138 "EHLO mail2.shareable.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752933Ab0FBNAk (ORCPT ); Wed, 2 Jun 2010 09:00:40 -0400 Date: Wed, 2 Jun 2010 14:00:14 +0100 From: Jamie Lokier To: Dan Magenheimer Cc: chris.mason@oracle.com, viro@zeniv.linux.org.uk, akpm@linux-foundation.org, adilger@sun.com, tytso@mit.edu, mfasheh@suse.com, joel.becker@oracle.com, matthew@wil.cx, linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, ocfs2-devel@oss.oracle.com, linux-mm@kvack.org, ngupta@vflare.org, jeremy@goop.org, JBeulich@novell.com, kurt.hackel@oracle.com, npiggin@suse.de, dave.mccracken@oracle.com, riel@redhat.com, avi@redhat.com, konrad.wilk@oracle.com Subject: Re: [PATCH V2 0/7] Cleancache (was Transcendent Memory): overview Message-ID: <20100602130014.GB7238@shareable.org> References: <20100528173510.GA12166@ca-server1.us.oracle.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20100528173510.GA12166@ca-server1.us.oracle.com> User-Agent: Mutt/1.5.13 (2006-08-11) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 852 Lines: 19 Dan Magenheimer wrote: > Most important, cleancache is "ephemeral". Pages which are copied into > cleancache have an indefinite lifetime which is completely unknowable > by the kernel and so may or may not still be in cleancache at any later time. > Thus, as its name implies, cleancache is not suitable for dirty pages. The > pseudo-RAM has complete discretion over what pages to preserve and what > pages to discard and when. Fwiw, the feature sounds useful to userspace too, for those things with memory hungry caches like web browsers. Any plans to make it available to userspace? Thanks, -- Jamie -- 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/