From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751151AbVHLHGt (ORCPT ); Fri, 12 Aug 2005 03:06:49 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751152AbVHLHGt (ORCPT ); Fri, 12 Aug 2005 03:06:49 -0400 Received: from mx2.elte.hu ([157.181.151.9]:29407 "EHLO mx2.elte.hu") by vger.kernel.org with ESMTP id S1751151AbVHLHGt (ORCPT ); Fri, 12 Aug 2005 03:06:49 -0400 Date: Fri, 12 Aug 2005 09:07:26 +0200 From: Ingo Molnar To: Lee Revell Cc: linux-kernel@vger.kernel.org, Thomas Gleixner , "Paul E. McKenney" , george anzinger Subject: Re: [patch] Real-Time Preemption, -RT-2.6.13-rc4-V0.7.53-01, High Resolution Timers & RCU-tasklist features Message-ID: <20050812070726.GB13938@elte.hu> References: <20050811110051.GA20872@elte.hu> <1123816044.4453.7.camel@mindpipe> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1123816044.4453.7.camel@mindpipe> User-Agent: Mutt/1.4.2.1i X-ELTE-SpamVersion: MailScanner 4.31.6-itk1 (ELTE 1.2) SpamAssassin 2.63 ClamAV 0.73 X-ELTE-VirusStatus: clean X-ELTE-SpamCheck: no X-ELTE-SpamCheck-Details: score=-4.9, required 5.9, autolearn=not spam, BAYES_00 -4.90 X-ELTE-SpamLevel: X-ELTE-SpamScore: -4 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org * Lee Revell wrote: > On Thu, 2005-08-11 at 13:00 +0200, Ingo Molnar wrote: > > i have released the -53-01 Real-Time Preemption patch, which can be > > downloaded from: > > > > http://redhat.com/~mingo/realtime-preempt/ > > > > there are two new features in this release, which justified the jump > > from .52 to .53: > > > > - the inclusion of the High Resolution Timers patch, written by > > George Anzinger, and ported/improved/cleaned-up by Thomas Gleixner. > > > > George, > > Very nice to see this going in (via) the RT patch. > > Can we get a real help text here: > > Clock & Timer Selection > > 1. Legacy Timer Support (LEGACY_TIMER) (NEW) > 2. HPET Timer Support (HPET_TIMER) > 3. High Resolution Timer Support (HIGH_RES_TIMERS) (NEW) > choice[1-3?]: ? > > You may have either HPET, High Resolution, or Legacy timer support. > > This would be a great place to put some of your extensive docs about the > various timer sources and issues on x86. I have always thought the HRT > docs were the best source on the net for this info, and I refer people > to it whenever someone has a question about timers on the linux audio > lists. > > The docs for "High Resolution Timer clock source" are great. > > Can we get more docs here: > > HRT Softirg dynamic priority adjustment (HIGH_RES_TIMERS_DYN_PRIO) > ^^^ typo > [N/y/?] (NEW) ? > > This option enables the dynamic priority adjustment of the > high resolution timer soft interrupt > > No point documenting this one if it's expected to go away though. this feature is from Thomas - and most of the PREEMPT_RT integration work too (and hence all the bugs are purely his fault too! ;-). In the -53-03 patch i've made HIGH_RES_TIMERS_DYN_PRIO always-on for PREEMPT_RT, but for other preemption models it's still selectable individually, so some more docs would indeed be useful. Ingo