Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755262AbXJBSh2 (ORCPT ); Tue, 2 Oct 2007 14:37:28 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753022AbXJBShU (ORCPT ); Tue, 2 Oct 2007 14:37:20 -0400 Received: from mx1.redhat.com ([66.187.233.31]:45556 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752962AbXJBShU (ORCPT ); Tue, 2 Oct 2007 14:37:20 -0400 Message-ID: <47028F85.4030708@redhat.com> Date: Tue, 02 Oct 2007 14:35:49 -0400 From: Chuck Ebbert Organization: Red Hat User-Agent: Thunderbird 1.5.0.12 (X11/20070719) MIME-Version: 1.0 To: Fengguang Wu CC: Andrew Morton , Greg KH , Chakri n , Peter Zijlstra , Krzysztof Oledzki , linux-pm , lkml , richard kennedy , Ingo Molnar Subject: Re: [PATCH] writeback: avoid possible balance_dirty_pages() lockup on a light-load bdi References: <92cbf19b0709272332s25684643odaade0e98cb3a1f4@mail.gmail.com> <391063897.19256@ustc.edu.cn> <470118EE.1020103@redhat.com> <391290444.23950@ustc.edu.cn> <20071001191457.2f7c7538.akpm@linux-foundation.org> <20071002121327.GA5718@mail.ustc.edu.cn> <391331626.16970@ustc.edu.cn> In-Reply-To: <391331626.16970@ustc.edu.cn> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 816 Lines: 19 On 10/02/2007 09:27 AM, Fengguang Wu wrote: > On Tue, Oct 02, 2007 at 08:13:27PM +0800, Fengguang Wu wrote: > [...] >> One more serious problem is, a busy writer could also drain all the >> dirty pages and make (nr_writeback == dirty_limit+1MB). In that case, >> I suspect the light-load sdb writer still have good chance to >> make progress(need confirmation). > > Well it seems to be a really tricky issue without knowing the per-bdi > numbers. Maybe we could just encourage users to upgrade to 2.6.24... > Yeah, and if that doesn't work there's always 2.6.25... :/ - 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/