From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 6 Jun 2001 05:23:15 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 6 Jun 2001 05:23:05 -0400 Received: from cisco7500-mainGW.gts.cz ([194.213.32.131]:18949 "EHLO bug.ucw.cz") by vger.kernel.org with ESMTP id ; Wed, 6 Jun 2001 05:22:54 -0400 Message-ID: <20010605233816.A512@bug.ucw.cz> Date: Tue, 5 Jun 2001 23:38:16 +0200 From: Pavel Machek To: Alan Cox , "H. Peter Anvin" Cc: linux-kernel@vger.kernel.org Subject: Re: [PATCH] fs/devfs/base.c In-Reply-To: <9fht4j$cce$1@cesium.transmeta.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.93i In-Reply-To: ; from Alan Cox on Tue, Jun 05, 2001 at 07:56:37AM +0100 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi! > > It's trivial to calculate for DAGs -- directed acyclic graphs. It's > > when the "acyclic" constraint is violated that you have problems! > > It may well be that interrupt stacks are a win anyway. If we can get the kernel > struct out of the stack pages (which would fix some very unpleasant cache > colour problems) and take the non irq stack down to 4K then irq stacks would > pay off once you had 25 or so processes on a system For what it is worth, we are using interrupt stack on x86-64. And it was not *that* painfull. Pavel -- I'm pavel@ucw.cz. "In my country we have almost anarchy and I don't care." Panos Katsaloulis describing me w.r.t. patents at discuss@linmodems.org