From mboxrd@z Thu Jan 1 00:00:00 1970 From: Arjan van de Ven Subject: Re: [PATCH] x86, acpi, idle: Restructure the mwait idle routines Date: Tue, 19 Nov 2013 06:22:43 -0800 Message-ID: <528B7433.7020507@linux.intel.com> References: <20131119090019.GJ3866@twins.programming.kicks-ass.net> <20131119090859.GC3694@twins.programming.kicks-ass.net> <20131119113153.GD3694@twins.programming.kicks-ass.net> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mga02.intel.com ([134.134.136.20]:12803 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750823Ab3KSOXE (ORCPT ); Tue, 19 Nov 2013 09:23:04 -0500 In-Reply-To: <20131119113153.GD3694@twins.programming.kicks-ass.net> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Peter Zijlstra , lenb@kernel.org, rjw@rjwysocki.net, linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org Cc: shaohua.li@intel.com, rui.zhang@intel.com, jacob.jun.pan@linux.intel.com, Mike Galbraith , Ingo Molnar , Thomas Gleixner , hpa@zytor.com > diff --git a/drivers/thermal/intel_powerclamp.c b/drivers/thermal/intel_powerclamp.c > index 8f181b3f842b..e8275f2df9af 100644 > --- a/drivers/thermal/intel_powerclamp.c > +++ b/drivers/thermal/intel_powerclamp.c > @@ -438,9 +438,7 @@ static int clamp_thread(void *arg) > */ > local_touch_nmi(); > stop_critical_timings(); > - __monitor((void *)¤t_thread_info()->flags, 0, 0); > - cpu_relax(); /* allow HT sibling to run */ > - __mwait(eax, ecx); > + mwait_idle_with_hints(eax, ecx); > start_critical_timings(); > atomic_inc(&idle_wakeup_counter); > } > hmm I take it that mwait_idle_with_hints is the one that also checks need_resched() ? if so... powerclamp may not want to use that (the whole point is to NOT give the cpu to tasks!)