From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1425316AbcFIHgC (ORCPT ); Thu, 9 Jun 2016 03:36:02 -0400 Received: from mail-pa0-f52.google.com ([209.85.220.52]:33446 "EHLO mail-pa0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1423277AbcFIHf7 (ORCPT ); Thu, 9 Jun 2016 03:35:59 -0400 Message-ID: <57591c5e.582b620a.f8dc2.19dd@mx.google.com> X-Google-Original-Message-ID: <1465457684-9848-2-git-send-email-y> From: zhaoyang.huang@linaro.org X-Google-Original-From: y To: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, zhaoyang.huang@spreadtrum.com, tglx@linutronix.de Subject: [RFC PATCH v2 2/2] power/idle: enhance the precision of sleep_length Date: Thu, 9 Jun 2016 15:34:44 +0800 X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1465457684-9848-1-git-send-email-y> References: <1465457684-9848-1-git-send-email-y> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Zhaoyang Huang There should be a gap between tick_nohz_idle_enter and tick_nohz_get_sleep_length when idle, which will cause the sleep_length is not very precised. Change it in this patch. Signed-off-by: Zhaoyang Huang --- kernel/time/tick-sched.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index 536ada8..ee3be3d 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -975,6 +975,11 @@ void tick_nohz_irq_exit(void) ktime_t tick_nohz_get_sleep_length(void) { struct tick_sched *ts = this_cpu_ptr(&tick_cpu_sched); + struct clock_event_device *dev = __this_cpu_read(tick_cpu_device.evtdev); + ktime_t now; + + now = ktime_get(); + ts->sleep_length = ktime_sub(dev->next_event, now); return ts->sleep_length; } -- 1.7.9.5