From patchwork Fri Mar 3 20:41:31 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lina Iyer X-Patchwork-Id: 9603533 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 4D3FB60414 for ; Fri, 3 Mar 2017 20:50:18 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3B47028584 for ; Fri, 3 Mar 2017 20:50:18 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2FE8D28589; Fri, 3 Mar 2017 20:50:18 +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=-7.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, RCVD_IN_DNSWL_HI autolearn=unavailable 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 9EA9D28588 for ; Fri, 3 Mar 2017 20:50:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752118AbdCCUuQ (ORCPT ); Fri, 3 Mar 2017 15:50:16 -0500 Received: from mail-pf0-f181.google.com ([209.85.192.181]:35114 "EHLO mail-pf0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752107AbdCCUuP (ORCPT ); Fri, 3 Mar 2017 15:50:15 -0500 Received: by mail-pf0-f181.google.com with SMTP id j5so36726014pfb.2 for ; Fri, 03 Mar 2017 12:50:14 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=U+qE9zaF3BN7TiNKr3Pfn4NyoGuMva//UYp+wbkMXd8=; b=d1V19wvAvZ6mDyg86n8TvsHoTIfveOw3ib2Nu6H7p3wn7sd/Lobt//454Y4Ak2xr39 1G+5rMrtL6YO7lJyFBp4kJEF0zSqrnJnHobT118FhQMEm2l++ay5fbbhw+DJ893ovEi+ F76qxePgleM1VRDoWADfJnJMZ6JtNwz07ae7s= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=U+qE9zaF3BN7TiNKr3Pfn4NyoGuMva//UYp+wbkMXd8=; b=a8lL4WyyRMAKYp182UkCDCPjqHlmrWNrm/ZITrFra1lWIouVNKdmYJa9zmqnz6AnDr 8m9I88B06k6V6Z78hChBvVgKtw+PfGseT3PYI/71AArKC3p9EsheO6p1ghb2Xm8EZPmf Dhimxhu+5hVYR7MhJuspef8xOUhIlr+Ocf2TtRqpQvgKQ0mMjayn6CL4zx0ncwkzkqo1 JtjqoTHvI7aA8EC3D73X72HL66wFbwxYEcpafl4y43vbrJw3ANtWKGE2t6o1A1NAdj/V lfla4WN7kPHJNkHM3Iimi+olpfvTanWaFkf3WV+99KyGBajcVGUyYUTO738j1KJEKT35 VjGw== X-Gm-Message-State: AMke39m9kLqX3B29M6RweOdknpAwtL0U00tm0tKpBhYR0Op8/gdv4keWxb4Cv6cP+paVFIBL X-Received: by 10.98.57.23 with SMTP id g23mr5814339pfa.32.1488573712296; Fri, 03 Mar 2017 12:41:52 -0800 (PST) Received: from ubuntu.localdomain (i-global254.qualcomm.com. [199.106.103.254]) by smtp.gmail.com with ESMTPSA id o189sm25207003pga.12.2017.03.03.12.41.50 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 03 Mar 2017 12:41:51 -0800 (PST) From: Lina Iyer To: ulf.hansson@linaro.org, khilman@kernel.org, rjw@rjwysocki.net, linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: andy.gross@linaro.org, sboyd@codeaurora.org, linux-arm-msm@vger.kernel.org, brendan.jackman@arm.com, lorenzo.pieralisi@arm.com, sudeep.holla@arm.com, Juri.Lelli@arm.com, Lina Iyer , Thomas Gleixner Subject: [PATCH V5 5/9] timer: Export next wake up of a CPU Date: Fri, 3 Mar 2017 12:41:31 -0800 Message-Id: <1488573695-106680-6-git-send-email-lina.iyer@linaro.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1488573695-106680-1-git-send-email-lina.iyer@linaro.org> References: <1488573695-106680-1-git-send-email-lina.iyer@linaro.org> 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 Knowing the sleep length of the CPU is useful for the power state determination on idle. The value is relative to the time when the call was invoked by the CPU. This doesn't work well when there is a need to know when the actual wakeup is. By reading the next wake up event of a CPU, governors can determine the first CPU to wake up (due to timer) amongst a cluster of CPUs and the sleep time available between the last CPU to idle and the first CPU to resume. This information is useful to determine if the caches and other common hardware blocks can also be put in idle during this common period of inactivity. Cc: Thomas Gleixner Cc: Stephen Boyd Signed-off-by: Lina Iyer --- include/linux/tick.h | 10 ++++++++++ kernel/time/tick-sched.c | 11 +++++++++++ 2 files changed, 21 insertions(+) diff --git a/include/linux/tick.h b/include/linux/tick.h index a04fea1..2416021 100644 --- a/include/linux/tick.h +++ b/include/linux/tick.h @@ -117,6 +117,7 @@ extern void tick_nohz_idle_enter(void); extern void tick_nohz_idle_exit(void); extern void tick_nohz_irq_exit(void); extern ktime_t tick_nohz_get_sleep_length(void); +extern ktime_t tick_nohz_get_next_wakeup(int cpu); extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time); extern u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time); #else /* !CONFIG_NO_HZ_COMMON */ @@ -129,6 +130,15 @@ static inline ktime_t tick_nohz_get_sleep_length(void) { return NSEC_PER_SEC / HZ; } + +static inline ktime_t tick_nohz_get_next_wakeup(int cpu) +{ + ktime_t len = NSEC_PER_SEC/HZ; + + /* Next wake up is the tick period, assume it starts now */ + return ktime_add(len, ktime_get()); +} + static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; } static inline u64 get_cpu_iowait_time_us(int cpu, u64 *unused) { return -1; } #endif /* !CONFIG_NO_HZ_COMMON */ diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c index 2c115fd..03e7c17 100644 --- a/kernel/time/tick-sched.c +++ b/kernel/time/tick-sched.c @@ -989,6 +989,17 @@ ktime_t tick_nohz_get_sleep_length(void) return ts->sleep_length; } +/** + * tick_nohz_get_next_wakeup - return the next wake up of the CPU + */ +ktime_t tick_nohz_get_next_wakeup(int cpu) +{ + struct clock_event_device *dev = + per_cpu(tick_cpu_device.evtdev, cpu); + + return dev->next_event; +} + static void tick_nohz_account_idle_ticks(struct tick_sched *ts) { #ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE