Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752852AbdI3HVp (ORCPT ); Sat, 30 Sep 2017 03:21:45 -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 S1751644AbdI3HVn (ORCPT ); Sat, 30 Sep 2017 03:21:43 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.42,456,1500966000"; d="scan'208";a="1020089320" 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 Subject: [RFC PATCH v2 5/8] timers: keep sleep length updated as needed Date: Sat, 30 Sep 2017 15:20:31 +0800 Message-Id: <1506756034-6340-6-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: 774 Lines: 25 sleep length indicates how long we'll be idle. Currently, it's updated only when tick nohz enters. These patch series make a new requirement with tick, so we should keep sleep length updated as needed --- kernel/time/tick-sched.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index d663fab..94fb9b8 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -1008,8 +1008,11 @@ void tick_nohz_irq_exit(void) */ ktime_t tick_nohz_get_sleep_length(void) { + struct clock_event_device *dev = __this_cpu_read(tick_cpu_device.evtdev); struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched); + ts->sleep_length = ktime_sub(dev->next_event, ktime_get()); + return ts->sleep_length; } -- 2.7.4