From patchwork Mon Aug 18 08:37:32 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chuansheng Liu X-Patchwork-Id: 4733591 Return-Path: X-Original-To: patchwork-linux-pm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id A3DE4C033C for ; Mon, 18 Aug 2014 08:53:29 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id D81FC2010E for ; Mon, 18 Aug 2014 08:53:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8376F20125 for ; Mon, 18 Aug 2014 08:53:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752104AbaHRIwE (ORCPT ); Mon, 18 Aug 2014 04:52:04 -0400 Received: from mga09.intel.com ([134.134.136.24]:55964 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752100AbaHRIwC (ORCPT ); Mon, 18 Aug 2014 04:52:02 -0400 Received: from orsmga001.jf.intel.com ([10.7.209.18]) by orsmga102.jf.intel.com with ESMTP; 18 Aug 2014 01:46:07 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.01,885,1400050800"; d="scan'208";a="559928771" Received: from shsibuild003.sh.intel.com ([10.239.146.212]) by orsmga001.jf.intel.com with ESMTP; 18 Aug 2014 01:51:39 -0700 From: Chuansheng Liu To: luto@amacapital.net, peterz@infradead.org, daniel.lezcano@linaro.org, rjw@rjwysocki.net, mingo@redhat.com Cc: linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, changcheng.liu@intel.com, xiaoming.wang@intel.com, souvik.k.chakravarty@intel.com, chuansheng.liu@intel.com Subject: [PATCH 3/3] cpuidle: Using the wake_up_all_cpus() to wake up all idle cpus Date: Mon, 18 Aug 2014 16:37:32 +0800 Message-Id: <1408351052-25075-3-git-send-email-chuansheng.liu@intel.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1408351052-25075-1-git-send-email-chuansheng.liu@intel.com> References: <1408351052-25075-1-git-send-email-chuansheng.liu@intel.com> Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Spam-Status: No, score=-7.6 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Currently kick_all_cpus_sync() or smp_call_function() can not break the polling idle cpu immediately. Here using wake_up_all_cpus() which can wake up the polling idle cpu quickly is much helpful for power. Signed-off-by: Chuansheng Liu --- drivers/cpuidle/cpuidle.c | 9 ++------- 1 file changed, 2 insertions(+), 7 deletions(-) diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c index ee9df5e..56d5c4d 100644 --- a/drivers/cpuidle/cpuidle.c +++ b/drivers/cpuidle/cpuidle.c @@ -223,7 +223,7 @@ void cpuidle_uninstall_idle_handler(void) { if (enabled_devices) { initialized = 0; - kick_all_cpus_sync(); + wake_up_all_cpus(); } } @@ -530,11 +530,6 @@ EXPORT_SYMBOL_GPL(cpuidle_register); #ifdef CONFIG_SMP -static void smp_callback(void *v) -{ - /* we already woke the CPU up, nothing more to do */ -} - /* * This function gets called when a part of the kernel has a new latency * requirement. This means we need to get all processors out of their C-state, @@ -544,7 +539,7 @@ static void smp_callback(void *v) static int cpuidle_latency_notify(struct notifier_block *b, unsigned long l, void *v) { - smp_call_function(smp_callback, NULL, 1); + wake_up_all_cpus(); return NOTIFY_OK; }