Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752915AbdI3HWB (ORCPT ); Sat, 30 Sep 2017 03:22:01 -0400 Received: from mga01.intel.com ([192.55.52.88]:36037 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752882AbdI3HVu (ORCPT ); Sat, 30 Sep 2017 03:21:50 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.42,456,1500966000"; d="scan'208";a="1020089333" From: Aubrey Li To: tglx@linutronix.de, peterz@infradead.org, rjw@rjwysocki.net, len.brown@intel.com, ak@linux.intel.com, tim.c.chen@linux.intel.com Cc: x86@kernel.org, linux-kernel@vger.kernel.org, Aubrey Li , Aubrey Li Subject: [RFC PATCH v2 8/8] cpuidle: introduce run queue average idle to make idle prediction Date: Sat, 30 Sep 2017 15:20:34 +0800 Message-Id: <1506756034-6340-9-git-send-email-aubrey.li@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1506756034-6340-1-git-send-email-aubrey.li@intel.com> References: <1506756034-6340-1-git-send-email-aubrey.li@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1891 Lines: 63 Introduce run queue average idle in scheduler as a factor to make idle prediction Signed-off-by: Aubrey Li --- drivers/cpuidle/cpuidle.c | 12 ++++++++++++ include/linux/cpuidle.h | 1 + kernel/sched/idle.c | 5 +++++ 3 files changed, 18 insertions(+) diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c index be56cea..9424a2d 100644 --- a/drivers/cpuidle/cpuidle.c +++ b/drivers/cpuidle/cpuidle.c @@ -364,6 +364,18 @@ void cpuidle_predict(void) return; } + /* + * check scheduler if the coming idle is likely a fast idle + */ + idle_interval = div_u64(sched_idle_avg(), NSEC_PER_USEC); + if (idle_interval < overhead_threshold) { + dev->idle_stat.fast_idle = true; + return; + } + + /* + * check the idle governor if the coming idle is likely a fast idle + */ if (cpuidle_curr_governor->predict) { dev->idle_stat.predicted_us = cpuidle_curr_governor->predict(); /* diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h index 45b8264..387d72b 100644 --- a/include/linux/cpuidle.h +++ b/include/linux/cpuidle.h @@ -234,6 +234,7 @@ static inline void cpuidle_use_deepest_state(bool enable) /* kernel/sched/idle.c */ extern void sched_idle_set_state(struct cpuidle_state *idle_state); extern void default_idle_call(void); +extern u64 sched_idle_avg(void); #ifdef CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED void cpuidle_coupled_parallel_barrier(struct cpuidle_device *dev, atomic_t *a); diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c index 8704f3c..d23b472 100644 --- a/kernel/sched/idle.c +++ b/kernel/sched/idle.c @@ -30,6 +30,11 @@ void sched_idle_set_state(struct cpuidle_state *idle_state) idle_set_state(this_rq(), idle_state); } +u64 sched_idle_avg(void) +{ + return this_rq()->avg_idle; +} + static int __read_mostly cpu_idle_force_poll; void cpu_idle_poll_ctrl(bool enable) -- 2.7.4