From: Arnd Bergmann Subject: Re: [RFC 0/7] [RFC] cramfs: fake write support Date: Sun, 1 Jun 2008 10:52:03 +0200 Message-ID: <200806011052.05921.arnd@arndb.de> References: <200805311737.58991.arnd@arndb.de> <200805312240.50720.arnd@arndb.de> <48421D65.8040301@lougher.demon.co.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: David Newall , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, hch@lst.de To: Phillip Lougher Return-path: Received: from moutng.kundenserver.de ([212.227.126.177]:64210 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751401AbYFAIwY convert rfc822-to-8bit (ORCPT ); Sun, 1 Jun 2008 04:52:24 -0400 In-Reply-To: <48421D65.8040301@lougher.demon.co.uk> Content-Disposition: inline Sender: linux-fsdevel-owner@vger.kernel.org List-ID: On Sunday 01 June 2008, Phillip Lougher wrote: > If I read the patches correctly, when a file page is written to, only= =20 > that page gets copied into the page cache and locked, the other pages= =20 > continue to be read off disk from cramfs? =A0With Unionfs a page writ= e=20 > causes the entire file to be copied up to the r/w tmpfs and locked in= to=20 > the page cache causing unnecessary RAM overhead. Yes, that's right. Arnd <>< -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel= " in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html