Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754839AbXEAXUb (ORCPT ); Tue, 1 May 2007 19:20:31 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754856AbXEAXUb (ORCPT ); Tue, 1 May 2007 19:20:31 -0400 Received: from waste.org ([66.93.16.53]:33256 "EHLO waste.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754854AbXEAXUa (ORCPT ); Tue, 1 May 2007 19:20:30 -0400 Date: Tue, 1 May 2007 18:15:48 -0500 From: Matt Mackall To: Bill Irwin , Christoph Hellwig , Andi Kleen , Alan Cox , David Chinner , Zan Lynx , Adrian Bunk , Linux Kernel Subject: Re: [2/6] add config option to vmalloc stacks (was: Re: [-mm patch] i386: enable 4k stacks by default) Message-ID: <20070501231548.GF11115@waste.org> References: <20070430104806.GA14944@infradead.org> <20070430173819.GC19966@holomorphy.com> <20070430174310.GE19966@holomorphy.com> <20070430181104.GB14739@infradead.org> <20070430190952.GP31925@holomorphy.com> <20070430191511.GA25318@infradead.org> <20070501223606.GQ11166@waste.org> <20070501225125.GU26598@holomorphy.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070501225125.GU26598@holomorphy.com> User-Agent: Mutt/1.5.13 (2006-08-11) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1132 Lines: 27 On Tue, May 01, 2007 at 03:51:25PM -0700, Bill Irwin wrote: > On Mon, Apr 30, 2007 at 08:15:11PM +0100, Christoph Hellwig wrote: > >> So if you want to invest some time into getting this into mergeable > >> shape I'd suggest you redo the patch series in the following way: > >> patch 1: dynamic allocated irq stacks > > On Tue, May 01, 2007 at 05:36:06PM -0500, Matt Mackall wrote: > > Can we register them lazily at request_irq time? > > These IRQ stacks are per-cpu, not per-IRQ. It may make sense to > implement per-IRQ stacks, in which case dynamic allocation at the time > of request_irq() will make sense. > > Would you like me to implement per-IRQ IRQ stacks? It's probably the "right" thing to do, but it does have higher overhead for most systems. But it also gives a very obvious migration path to -rt's irq threads. -- Mathematics is the supreme nostalgia of our time. - 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/