From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754407AbcFPQLe (ORCPT ); Thu, 16 Jun 2016 12:11:34 -0400 Received: from www.linutronix.de ([62.245.132.108]:46422 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751530AbcFPQLc (ORCPT ); Thu, 16 Jun 2016 12:11:32 -0400 Date: Thu, 16 Jun 2016 18:09:31 +0200 (CEST) From: Thomas Gleixner To: Arjan van de Ven cc: Eric Dumazet , Peter Zijlstra , Ingo Molnar , LKML , "Paul E. McKenney" , Frederic Weisbecker , Chris Mason , Arjan van de Ven , Linus Torvalds , George Spelvin Subject: Re: [patch 13/20] timer: Switch to a non cascading wheel In-Reply-To: Message-ID: References: <20160613070440.950649741@linutronix.de> <20160613075929.282143900@linutronix.de> <20160613114005.GY30909@twins.programming.kicks-ass.net> <20160614101144.GA849@gmail.com> <20160614204225.GI30154@twins.programming.kicks-ass.net> User-Agent: Alpine 2.11 (DEB 23 2013-08-11) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 16 Jun 2016, Arjan van de Ven wrote: > I think there's 2 elements on the interface. > > 1) having a relative interface to the current time (avoid use of > absolute jiffies in drivers) That's the easy part :) > 2) having wallclock units. Making HZ always be 1000 is effectively > doing that as well (1 msec after all) Right. And it allows us to switch over the whole code base w/o fiddling with it in one go. Cleanups should obviously take place after that. Thanks, tglx