From patchwork Mon Nov 28 21:44:52 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jacob Pan X-Patchwork-Id: 9450593 X-Patchwork-Delegate: rjw@sisk.pl Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 2956B6071C for ; Mon, 28 Nov 2016 21:47:21 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1B10927EE9 for ; Mon, 28 Nov 2016 21:47:21 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 0F71028047; Mon, 28 Nov 2016 21:47:21 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6F55F27EE9 for ; Mon, 28 Nov 2016 21:47:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755752AbcK1VrJ (ORCPT ); Mon, 28 Nov 2016 16:47:09 -0500 Received: from mga11.intel.com ([192.55.52.93]:21651 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755533AbcK1Vqp (ORCPT ); Mon, 28 Nov 2016 16:46:45 -0500 Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga102.fm.intel.com with ESMTP; 28 Nov 2016 13:46:42 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.31,565,1473145200"; d="scan'208";a="36490949" Received: from icelake.jf.intel.com ([10.7.199.162]) by orsmga005.jf.intel.com with ESMTP; 28 Nov 2016 13:46:42 -0800 From: Jacob Pan To: LKML , Linux PM , Rafael Wysocki , Eduardo Valentin , Zhang Rui Cc: Peter Zijlstra , Ingo Molnar , Thomas Gleixner , Arjan van de Ven , Srinivas Pandruvada , Len Brown , Petr Mladek , Sebastian Andrzej Siewior , Jacob Pan Subject: [PATCH 4/4] thermal/intel_powerclamp: stop sched tick in forced idle Date: Mon, 28 Nov 2016 13:44:52 -0800 Message-Id: <1480369492-23901-5-git-send-email-jacob.jun.pan@linux.intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1480369492-23901-1-git-send-email-jacob.jun.pan@linux.intel.com> References: <1480369492-23901-1-git-send-email-jacob.jun.pan@linux.intel.com> Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP With the introduction of play_idle(), idle injection kthread can go through the normal idle task processing to get correct accounting and turn off scheduler tick when possible. Signed-off-by: Jacob Pan --- drivers/thermal/intel_powerclamp.c | 35 +---------------------------------- 1 file changed, 1 insertion(+), 34 deletions(-) diff --git a/drivers/thermal/intel_powerclamp.c b/drivers/thermal/intel_powerclamp.c index 1310283..83e6971 100644 --- a/drivers/thermal/intel_powerclamp.c +++ b/drivers/thermal/intel_powerclamp.c @@ -92,7 +92,6 @@ struct powerclamp_worker_data { struct kthread_worker *worker; struct kthread_work balancing_work; struct kthread_delayed_work idle_injection_work; - struct timer_list wakeup_timer; unsigned int cpu; unsigned int count; unsigned int guard; @@ -277,11 +276,6 @@ static u64 pkg_state_counter(void) return count; } -static void noop_timer(unsigned long foo) -{ - /* empty... just the fact that we get the interrupt wakes us up */ -} - static unsigned int get_compensation(int ratio) { unsigned int comp = 0; @@ -431,7 +425,6 @@ static void clamp_balancing_func(struct kthread_work *work) static void clamp_idle_injection_func(struct kthread_work *work) { struct powerclamp_worker_data *w_data; - unsigned long target_jiffies; w_data = container_of(work, struct powerclamp_worker_data, idle_injection_work.work); @@ -452,31 +445,7 @@ static void clamp_idle_injection_func(struct kthread_work *work) if (should_skip) goto balance; - target_jiffies = jiffies + w_data->duration_jiffies; - mod_timer(&w_data->wakeup_timer, target_jiffies); - if (unlikely(local_softirq_pending())) - goto balance; - /* - * stop tick sched during idle time, interrupts are still - * allowed. thus jiffies are updated properly. - */ - preempt_disable(); - /* mwait until target jiffies is reached */ - while (time_before(jiffies, target_jiffies)) { - unsigned long ecx = 1; - unsigned long eax = target_mwait; - - /* - * REVISIT: may call enter_idle() to notify drivers who - * can save power during cpu idle. same for exit_idle() - */ - local_touch_nmi(); - stop_critical_timings(); - mwait_idle_with_hints(eax, ecx); - start_critical_timings(); - atomic_inc(&idle_wakeup_counter); - } - preempt_enable(); + play_idle(jiffies_to_msecs(w_data->duration_jiffies)); balance: if (clamping && w_data->clamping && cpu_online(w_data->cpu)) @@ -538,7 +507,6 @@ static void start_power_clamp_worker(unsigned long cpu) w_data->cpu = cpu; w_data->clamping = true; set_bit(cpu, cpu_clamping_mask); - setup_timer(&w_data->wakeup_timer, noop_timer, 0); sched_setscheduler(worker->task, SCHED_FIFO, &sparam); kthread_init_work(&w_data->balancing_work, clamp_balancing_func); kthread_init_delayed_work(&w_data->idle_injection_work, @@ -570,7 +538,6 @@ static void stop_power_clamp_worker(unsigned long cpu) * a big deal. The balancing work is fast and destroy kthread * will wait for it. */ - del_timer_sync(&w_data->wakeup_timer); clear_bit(w_data->cpu, cpu_clamping_mask); kthread_destroy_worker(w_data->worker);