From mboxrd@z Thu Jan 1 00:00:00 1970 From: Luiz Capitulino Subject: Re: [RFC 0/3] sched/idle: run-time support for setting idle polling Date: Wed, 30 Sep 2015 14:01:43 -0400 Message-ID: <20150930140143.7b187451@redhat.com> References: <1442954062-28578-1-git-send-email-lcapitulino@redhat.com> <1593595.NpzC8TsdGC@vostro.rjw.lan> <20150930154835.GP3604@twins.programming.kicks-ass.net> <20150930131610.1c2ba9c2@redhat.com> <20150930172713.GV3816@twins.programming.kicks-ass.net> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: Received: from mx1.redhat.com ([209.132.183.28]:37124 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932260AbbI3SBs (ORCPT ); Wed, 30 Sep 2015 14:01:48 -0400 In-Reply-To: <20150930172713.GV3816@twins.programming.kicks-ass.net> Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: Peter Zijlstra Cc: "Rafael J. Wysocki" , linux-kernel@vger.kernel.org, riel@redhat.com, rafael.j.wysocki@intel.com, mingo@kernel.org, Linux PM list , Len Brown , Thomas Gleixner On Wed, 30 Sep 2015 19:27:13 +0200 Peter Zijlstra wrote: > On Wed, Sep 30, 2015 at 01:16:10PM -0400, Luiz Capitulino wrote: > > On Wed, 30 Sep 2015 17:48:35 +0200 > > Peter Zijlstra wrote: > > > > Ideally every cpuidle driver would get 'polling' as a > > > default state and the QoS constraints might select it if nothing else > > > matches. > > > > So, I didn't know we had support for polling from the idle > > thread via cpuidle. This solves the first part of the problem. > > I'm not sure we do; I'm saying that's what we should do ;-) Yeah, but I think it's done already. Although I haven't tested it yet: [root@localhost ~]# cat /sys/devices/system/cpu/cpu0/cpuidle/state0/name POLL [root@localhost ~]# This is installed by drivers/cpuidle/driver.c:poll_idle_init().