Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S270498AbUJTT5l (ORCPT ); Wed, 20 Oct 2004 15:57:41 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S270573AbUJTT5U (ORCPT ); Wed, 20 Oct 2004 15:57:20 -0400 Received: from clock-tower.bc.nu ([81.2.110.250]:13787 "EHLO localhost.localdomain") by vger.kernel.org with ESMTP id S270491AbUJTTzY (ORCPT ); Wed, 20 Oct 2004 15:55:24 -0400 Subject: Re: [PATCH 1/3] Separate IRQ-stacks from 4K-stacks option From: Alan Cox To: Lee Revell Cc: Arjan van de Ven , Timothy Miller , Andrea Arcangeli , Hugh Dickins , "Martin J. Bligh" , Andrea Arcangeli , Chris Wedgwood , LKML , Christoph Hellwig In-Reply-To: <1098290345.1429.65.camel@krustophenia.net> References: <593560000.1094826651@[10.10.2.4]> <20040910151538.GA24434@devserv.devel.redhat.com> <20040910152852.GC15643@x30.random> <20040910153421.GD24434@devserv.devel.redhat.com> <41768858.8070709@techsource.com> <20041020153521.GB21556@devserv.devel.redhat.com> <1098290345.1429.65.camel@krustophenia.net> Content-Type: text/plain Content-Transfer-Encoding: 7bit Message-Id: <1098298310.12411.11.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.6 (1.4.6-2) Date: Wed, 20 Oct 2004 19:51:53 +0100 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 815 Lines: 21 On Mer, 2004-10-20 at 17:39, Lee Revell wrote: > The IDE I/O completion in hardirq context means that one can run for > almost 3ms. Apparently at OLS it was decided that the target for > desktop responsiveness was 1ms. So this is a real problem. > > What exactly do you mean by "draconian"? It means "fix the ide layer", patches welcome. Doing 4K IRQ stacks is actually not the problem - nor really is nesting. If that worries you then get_free_page() the irq structure and use the rest for the stack for _that_ IRQ handler. You won't need that much memory. Alan - 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/