Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754457AbbHJPde (ORCPT ); Mon, 10 Aug 2015 11:33:34 -0400 Received: from resqmta-ch2-11v.sys.comcast.net ([69.252.207.43]:40779 "EHLO resqmta-ch2-11v.sys.comcast.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751100AbbHJPdd (ORCPT ); Mon, 10 Aug 2015 11:33:33 -0400 Date: Mon, 10 Aug 2015 10:33:30 -0500 (CDT) From: Christoph Lameter X-X-Sender: cl@east.gentwo.org To: Frederic Weisbecker cc: Juri Lelli , Peter Zijlstra , LKML , Thomas Gleixner , Preeti U Murthy , Ingo Molnar , Viresh Kumar , Rik van Riel Subject: Re: [PATCH 07/10] sched: Migrate sched to use new tick dependency mask model In-Reply-To: <20150810141656.GA31251@lerouge> Message-ID: References: <1437669735-8786-1-git-send-email-fweisbec@gmail.com> <1437669735-8786-8-git-send-email-fweisbec@gmail.com> <20150803140046.GK19282@twins.programming.kicks-ass.net> <20150803145031.GD25554@lerouge> <20150803170911.GV25159@twins.programming.kicks-ass.net> <20150803173031.GB26022@lerouge> <20150804074116.GH25159@twins.programming.kicks-ass.net> <55C8AEDC.90603@arm.com> <20150810141656.GA31251@lerouge> Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 690 Lines: 16 On Mon, 10 Aug 2015, Frederic Weisbecker wrote: > I considered many times relying on hrtick btw but everyone seem to say it has a lot > of overhead, especially due to clock reprogramming on schedule() calls. Depends on how many ticks you can save I would think. It certainly is worthwhile if you can avoid 10 ticks? Can we figure out how far in the future that event is? If its more than 10 ticks away then its worth to switch off the tick? -- 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/