From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753830AbcFQJOI (ORCPT ); Fri, 17 Jun 2016 05:14:08 -0400 Received: from mail-pa0-f47.google.com ([209.85.220.47]:34347 "EHLO mail-pa0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755133AbcFQJOE (ORCPT ); Fri, 17 Jun 2016 05:14:04 -0400 From: Zhaoyang Huang X-Google-Original-From: Zhaoyang Huang 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: [RESEND PATCH v2 2/2] power/idle: enhance the precision of sleep_length Date: Fri, 17 Jun 2016 17:13:36 +0800 Message-Id: <1466154816-17900-2-git-send-email-zhaoyang.huang@spreadtrum.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1466154816-17900-1-git-send-email-zhaoyang.huang@spreadtrum.com> References: <1466154816-17900-1-git-send-email-zhaoyang.huang@spreadtrum.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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