From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261491AbVGLQDt (ORCPT ); Tue, 12 Jul 2005 12:03:49 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261487AbVGLQBt (ORCPT ); Tue, 12 Jul 2005 12:01:49 -0400 Received: from ms-smtp-01.nyroc.rr.com ([24.24.2.55]:9981 "EHLO ms-smtp-01.nyroc.rr.com") by vger.kernel.org with ESMTP id S261504AbVGLQA7 (ORCPT ); Tue, 12 Jul 2005 12:00:59 -0400 Subject: Re: Merging relayfs? From: Steven Rostedt To: Tom Zanussi Cc: richardj_moore@uk.ibm.com, varap@us.ibm.com, karim@opersys.com, linux-kernel@vger.kernel.org, akpm@osdl.org, Jason Baron In-Reply-To: <17107.57641.217499.429075@tut.ibm.com> References: <17107.6290.734560.231978@tut.ibm.com> <17107.57641.217499.429075@tut.ibm.com> Content-Type: text/plain Organization: Kihon Technologies Date: Tue, 12 Jul 2005 12:00:46 -0400 Message-Id: <1121184046.6917.51.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.2.2 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 2005-07-12 at 10:26 -0500, Tom Zanussi wrote: > I don't really know how we would get around using vmap - it seems like > the alternatives, such as managing an array of pages or something like > that, would slow down the logging path too much to make it useful as a > low overhead logging mechanism. I you have any ideas though, please > let me know. Tom, My logdev device was pretty quick! The managing of the pages were negligible to the copying of the data to the buffer. Although, sometimes you needed to copy across buffers, but this too wouldn't be too much of an impact. -- Steve