From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail190.messagelabs.com (mail190.messagelabs.com [216.82.249.51]) by kanga.kvack.org (Postfix) with ESMTP id 867A36B01AC for ; Wed, 2 Jun 2010 09:00:56 -0400 (EDT) Date: Wed, 2 Jun 2010 14:00:14 +0100 From: Jamie Lokier 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> Sender: owner-linux-mm@kvack.org 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 List-ID: 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, 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