From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Paul E. McKenney" Subject: Re: [PATCH] sched/rt: don't try to balance rt_runtime when it is futile Date: Tue, 20 May 2014 10:20:33 -0700 Message-ID: <20140520172033.GE4570@linux.vnet.ibm.com> References: <1400123931.5175.38.camel@marge.simpson.net> <1400386954.5140.36.camel@marge.simpson.net> <20140518052039.GF4570@linux.vnet.ibm.com> <1400402201.5166.13.camel@marge.simpson.net> <20140518155815.GK4570@linux.vnet.ibm.com> <1400467481.5211.48.camel@marge.simpson.net> <20140519053401.GP4570@linux.vnet.ibm.com> <20140520145350.GC17741@localhost.localdomain> <20140520155324.GD4570@linux.vnet.ibm.com> <20140520162433.GE17741@localhost.localdomain> Reply-To: paulmck@linux.vnet.ibm.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Mike Galbraith , Paul Gortmaker , linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org, Ingo Molnar , Peter Zijlstra , Steven Rostedt , Thomas Gleixner To: Frederic Weisbecker Return-path: Content-Disposition: inline In-Reply-To: <20140520162433.GE17741@localhost.localdomain> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-rt-users.vger.kernel.org On Tue, May 20, 2014 at 06:24:36PM +0200, Frederic Weisbecker wrote: > On Tue, May 20, 2014 at 08:53:24AM -0700, Paul E. McKenney wrote: > > On Tue, May 20, 2014 at 04:53:52PM +0200, Frederic Weisbecker wrote: [ . . . ] > > > We'll probably extend it that way in the future. But likely not in a near future. > > > > My guess is that Mike would be OK with making nohz_full choice of CPUs > > still at boot time, but that he would like the CPUs that are not to be > > in nohz_full state be able to opt out of the context-tracking overhead. > > Ok that might be possible. Although still require a bit of complication. > Lets wait for Mike input. Sounds good! Mike, would this do what you need? Thanx, Paul