From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751377AbVKILaj (ORCPT ); Wed, 9 Nov 2005 06:30:39 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751386AbVKILaj (ORCPT ); Wed, 9 Nov 2005 06:30:39 -0500 Received: from mx2.mail.elte.hu ([157.181.151.9]:62435 "EHLO mx2.mail.elte.hu") by vger.kernel.org with ESMTP id S1751377AbVKILai (ORCPT ); Wed, 9 Nov 2005 06:30:38 -0500 Date: Wed, 9 Nov 2005 12:30:53 +0100 From: Ingo Molnar To: john cooper Cc: LKML Subject: Re: MIPS PREEMPT_RT update.. Message-ID: <20051109113053.GA1012@elte.hu> References: <436B85E1.1050103@timesys.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <436B85E1.1050103@timesys.com> User-Agent: Mutt/1.4.2.1i X-ELTE-SpamScore: 0.0 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=0.0 required=5.9 tests=AWL autolearn=disabled SpamAssassin version=3.0.4 0.0 AWL AWL: From: address is in the auto white-list X-ELTE-VirusStatus: clean Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org * john cooper wrote: > As a qualification, I am still chasing a few problems which I suspect > are related to the Malta patch for 2.6.14 rather than the mips-rt > patch. One appears to be a TLB handler problem in 2.6.14. The other > appears to be potentially excessive context switching, although I > haven't had the opportunity yet to fully investigate this issue. I > will follow up should resolution of these feed back into generic > mips-rt support. FYI, i have released your big MIPS merge as part of 2.6.14-rt9. [please double-check i did not mis-merge any component] wrt. your TLB problems: it might be related that TLB handling got simplified (and sped up) with the introduction of a generic, preemptible method to handle TLB-gathers. There's no tlb-simple.h anymore. excessive context-switching might happen in some cases when we ping-pong short-held locks, and i'm certainly interested in a reproducer or analysis (or patch! :-). Ingo