Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756891AbYCAFyV (ORCPT ); Sat, 1 Mar 2008 00:54:21 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752633AbYCAFyL (ORCPT ); Sat, 1 Mar 2008 00:54:11 -0500 Received: from pentafluge.infradead.org ([213.146.154.40]:49062 "EHLO pentafluge.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752534AbYCAFyK (ORCPT ); Sat, 1 Mar 2008 00:54:10 -0500 Date: Fri, 29 Feb 2008 21:54:55 -0800 From: Greg KH To: mark gross Cc: Andrew Morton , lkml , linux-pci@atrey.karlin.mff.cuni.cz Subject: Re: [PATCH]iommu-iotlb-flushing Message-ID: <20080301055455.GB20032@kroah.com> References: <20080221000623.GA5510@linux.intel.com> <20080223000517.232704f3.akpm@linux-foundation.org> <20080229231841.GA6639@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080229231841.GA6639@linux.intel.com> User-Agent: Mutt/1.5.16 (2007-06-09) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1365 Lines: 30 On Fri, Feb 29, 2008 at 03:18:41PM -0800, mark gross wrote: > > > --- linux-2.6.24-mm1.orig/Documentation/kernel-parameters.txt 2008-02-12 07:12:06.000000000 -0800 > > > +++ linux-2.6.24-mm1/Documentation/kernel-parameters.txt 2008-02-13 11:17:22.000000000 -0800 > > > @@ -822,6 +822,10 @@ > > > than 32 bit addressing. The default is to look > > > for translation below 32 bit and if not available > > > then look in the higher range. > > > + strict [Default Off] > > > + With this option on every unmap_single operation will > > > + result in a hardware IOTLB flush operation as opposed > > > + to batching them for performance. > > > > boot-time options suck. Is it not possible to tweak this at runtime? > > Yes, I could easily create a sysfs or debugfs mechanism for turning it > on / off at run time. I would like input on the preferred way to do this. > sysfs or debugfs? Which is it, a debugging option, or something that anyone would want to change? If debugging, make it a debugfs file. Otherwise sysfs if fine, but be sure to add a Documentation/ABI/ file for it. thanks, greg k-h -- 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/