Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757006AbXFVV5c (ORCPT ); Fri, 22 Jun 2007 17:57:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753378AbXFVV5X (ORCPT ); Fri, 22 Jun 2007 17:57:23 -0400 Received: from homer.mvista.com ([63.81.120.158]:20243 "EHLO gateway-1237.mvista.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1753934AbXFVV5W (ORCPT ); Fri, 22 Jun 2007 17:57:22 -0400 Subject: Re: [RFC PATCH 0/6] Convert all tasklets to workqueues From: Daniel Walker To: Ingo Molnar Cc: Linus Torvalds , Steven Rostedt , LKML , Andrew Morton , Thomas Gleixner , Christoph Hellwig , john stultz , Oleg Nesterov , "Paul E. McKenney" , Dipankar Sarma , "David S. Miller" , matthew.wilcox@hp.com, kuznet@ms2.inr.ac.ru In-Reply-To: <20070622204058.GA11777@elte.hu> References: <20070622040014.234651401@goodmis.org> <20070622204058.GA11777@elte.hu> Content-Type: text/plain Date: Fri, 22 Jun 2007 14:53:21 -0700 Message-Id: <1182549202.3228.78.camel@dhcp193.mvista.com> Mime-Version: 1.0 X-Mailer: Evolution 2.10.2 (2.10.2-2.fc7) Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1032 Lines: 24 On Fri, 2007-06-22 at 22:40 +0200, Ingo Molnar wrote: > > - tasklets have certain fairness limitations. (they are executed in > softirq context and thus preempt everything, even if there is some > potentially more important, high-priority task waiting to be > executed.) Since -rt has been executing tasklets in process context for a long time, I'm not sure this change would cause to many regressions. However, it seems like implicit dependencies on "tasklets preempt everything" might crop up. The other issue is if they don't "preempt everything" (most of the time), what default priority do we give them (all of the time)? It seems like Christoph's suggestion of converting all the tasklets individually might be a better option, to deal with specific pitfalls. Daniel - 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/