From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932142AbWG2N63 (ORCPT ); Sat, 29 Jul 2006 09:58:29 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932147AbWG2N63 (ORCPT ); Sat, 29 Jul 2006 09:58:29 -0400 Received: from www.osadl.org ([213.239.205.134]:26806 "EHLO mail.tglx.de") by vger.kernel.org with ESMTP id S932142AbWG2N62 (ORCPT ); Sat, 29 Jul 2006 09:58:28 -0400 Date: Sat, 29 Jul 2006 16:02:50 +0200 Message-ID: <87zmesecfp.wl%tglx@linutronix.de> From: Thomas Gleixner To: jg@laptop.org Cc: "H. Peter Anvin" , Neil Horman , Dave Airlie , Segher Boessenkool , linux-kernel@vger.kernel.org, a.zummo@towertech.it, jg@freedesktop.org, Keith Packard Subject: Re: [PATCH] RTC: Add mmap method to rtc character driver In-Reply-To: <1153863542.1230.41.camel@localhost.localdomain> References: <20060725174100.GA4608@hmsreliant.homelinux.net> <03BCDC7F-13D9-42FC-86FC-30C76FD3B3B8@kernel.crashing.org> <20060725182833.GE4608@hmsreliant.homelinux.net> <44C66C91.8090700@zytor.com> <20060725192138.GI4608@hmsreliant.homelinux.net> <20060725194733.GJ4608@hmsreliant.homelinux.net> <21d7e9970607251304n5681bf44gc751c21fd79be99d@mail.gmail.com> <44C67E1A.7050105@zytor.com> <20060725204736.GK4608@hmsreliant.homelinux.net> <1153861094.1230.20.camel@localhost.localdomain> <44C6875F.4090300@zytor.com> <1153862087.1230.38.camel@localhost.localdomain> <44C68AA8.6080702@zytor.com> <1153863542.1230.41.camel@localhost.localdomain> User-Agent: Wanderlust/2.15.1 (Almost Unreal) SEMI/1.14.6 (Maruoka) FLIM/1.14.7 (=?ISO-8859-4?Q?Sanj=F2?=) APEL/10.6 Emacs/21.4 (x86_64-pc-linux-gnu) MULE/5.0 (SAKAKI) MIME-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka") Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org At Tue, 25 Jul 2006 17:39:01 -0400, Jim Gettys wrote: > > Keith's the expert (who wrote the smart scheduler): I'd take a wild ass > guess that 10ms is good enough. > > Maybe people can keep him on the cc list this time... > - Jim I talked to Keith about this at OLS and we agreed that a coarse counter (probably incremented along with jiffies) accessible via a vsyscall would be enough. I'm looking into this in the next days. tglx