From: khilman@kernel•org (Kevin Hilman)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH RFC 16/27] ARM: cpuidle: Record the next wakeup event of the CPU
Date: Thu, 19 Nov 2015 15:35:47 -0800 [thread overview]
Message-ID: <7hwptdsgto.fsf@deeprootsystems.com> (raw)
In-Reply-To: <1447799871-56374-17-git-send-email-lina.iyer@linaro.org> (Lina Iyer's message of "Tue, 17 Nov 2015 15:37:40 -0700")
Lina Iyer <lina.iyer@linaro•org> writes:
> Reading the next wakeup of the CPU can only be realiably done only from
> that CPU. In the idle enter path record the next wake up of the CPU. The
> information is useful to determine the sleep time left for the CPU.
>
> Signed-off-by: Lina Iyer <lina.iyer@linaro•org>
> ---
> drivers/cpuidle/cpuidle-arm.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/cpuidle/cpuidle-arm.c b/drivers/cpuidle/cpuidle-arm.c
> index 8e72a23..b3133ef 100644
> --- a/drivers/cpuidle/cpuidle-arm.c
> +++ b/drivers/cpuidle/cpuidle-arm.c
> @@ -18,9 +18,11 @@
> #include <linux/kernel.h>
> #include <linux/module.h>
> #include <linux/of.h>
> +#include <linux/pm_domain.h>
> #include <linux/pm_runtime.h>
> #include <linux/slab.h>
> #include <linux/rcupdate.h>
> +#include <linux/tick.h>
>
> #include <asm/cpuidle.h>
>
> @@ -49,7 +51,9 @@ static int arm_enter_idle_state(struct cpuidle_device *dev,
> ret = cpu_pm_enter();
> if (!ret) {
> struct device *cpu_dev = get_cpu_device(dev->cpu);
> + struct generic_pm_domain_data *gpd = dev_gpd_data(cpu_dev);
>
> + gpd->td.next_wakeup = tick_nohz_get_next_wakeup();
> RCU_NONIDLE(pm_runtime_put_sync_suspend(cpu_dev));
Maybe set this back to zero atomicaly, after wakeup?
Checking for non-zero that might be another way for the domain goveror that there
haven't been any CPU wakeups since the CPUs have gone idle.
Kevin
next prev parent reply other threads:[~2015-11-19 23:35 UTC|newest]
Thread overview: 83+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-17 22:37 [PATCH RFC 00/27] PM/Domains: Cluster idle support for ARM SoCs Lina Iyer
2015-11-17 22:37 ` [PATCH RFC 01/27] PM / Domains: core changes for multiple states Lina Iyer
2015-12-09 13:58 ` Ulf Hansson
2015-12-17 17:58 ` Axel Haslam
2015-12-17 21:19 ` Ulf Hansson
2015-11-17 22:37 ` [PATCH RFC 02/27] PM / Domains: Allow domain power states to be read from DT Lina Iyer
2015-12-10 16:53 ` Ulf Hansson
2015-12-15 10:07 ` Marc Titinger
2015-12-15 22:14 ` Lina Iyer
2015-12-16 21:36 ` Lina Iyer
2015-11-17 22:37 ` [PATCH RFC 03/27] PM / Domain: Add additional state specific param Lina Iyer
2015-11-19 21:33 ` Kevin Hilman
2015-11-17 22:37 ` [PATCH RFC 04/27] PM / Domains: make governor select deepest state Lina Iyer
2015-12-11 9:13 ` Ulf Hansson
2015-11-17 22:37 ` [PATCH RFC 05/27] PM / Domains: remove old power on/off latencies Lina Iyer
2015-11-18 14:57 ` [PATCH] ARM: imx6: pm: declare pm domain latency on power_state struct Lina Iyer
2015-11-23 13:31 ` Lucas Stach
2015-11-23 13:42 ` Lucas Stach
2015-12-04 23:19 ` Lina Iyer
2015-12-11 9:16 ` [PATCH RFC 05/27] PM / Domains: remove old power on/off latencies Ulf Hansson
2015-11-17 22:37 ` [PATCH RFC 06/27] PM / Domains: add debugfs 'states' and 'timings' seq files Lina Iyer
2015-12-11 11:46 ` Ulf Hansson
2015-12-16 11:07 ` Marc Titinger
2015-12-16 12:48 ` Ulf Hansson
2015-12-16 14:12 ` Marc Titinger
2015-11-17 22:37 ` [PATCH RFC 07/27] PM / Domains: Read domain residency from DT Lina Iyer
2015-11-24 20:41 ` Stephen Boyd
2015-12-11 11:54 ` Ulf Hansson
2015-11-17 22:37 ` [PATCH RFC 08/27] PM / Domains: Support IRQ safe PM domains Lina Iyer
2016-01-14 14:42 ` Ulf Hansson
2016-01-14 18:33 ` Lina Iyer
2016-01-15 8:55 ` Ulf Hansson
2016-01-15 16:57 ` Lina Iyer
2016-01-15 22:08 ` Ulf Hansson
2016-01-18 16:58 ` Lina Iyer
2016-01-18 17:00 ` Lina Iyer
2016-01-19 10:01 ` Ulf Hansson
2015-11-17 22:37 ` [PATCH RFC 09/27] PM / Domains: Attempt runtime suspend of IRQ safe parent domain Lina Iyer
2015-11-17 22:37 ` [PATCH RFC 10/27] drivers: power: Introduce PM domains for CPUs/clusters Lina Iyer
2015-11-24 20:52 ` Stephen Boyd
2015-11-17 22:37 ` [PATCH RFC 11/27] drivers: cpu: Define CPU devices as IRQ safe Lina Iyer
2015-11-17 22:37 ` [PATCH RFC 12/27] ARM: cpuidle: remove cpu parameter from the cpuidle_ops suspend hook Lina Iyer
2015-11-17 22:37 ` [PATCH RFC 13/27] ARM: cpuidle: Add runtime PM support for CPU idle Lina Iyer
2015-11-18 8:50 ` Zhaoyang Huang
2015-11-18 14:17 ` Lina Iyer
2015-11-19 22:10 ` Kevin Hilman
2015-11-17 22:37 ` [PATCH RFC 14/27] tick: get next wakeup event for the CPU Lina Iyer
2015-11-17 22:37 ` [PATCH RFC 15/27] PM / Domains: Add next_wakeup to device's timing data Lina Iyer
2015-11-19 22:19 ` Kevin Hilman
2015-11-20 15:58 ` Lina Iyer
2015-11-17 22:37 ` [PATCH RFC 16/27] ARM: cpuidle: Record the next wakeup event of the CPU Lina Iyer
2015-11-19 23:35 ` Kevin Hilman [this message]
2015-11-20 16:28 ` Lina Iyer
2015-11-24 18:29 ` Kevin Hilman
2015-11-17 22:37 ` [PATCH RFC 17/27] drivers: cpu-pd: Record CPUs that are part of the domain Lina Iyer
2015-11-24 21:00 ` Stephen Boyd
2015-11-25 14:13 ` Lina Iyer
2015-11-25 19:12 ` Stephen Boyd
2015-11-25 20:20 ` Lina Iyer
2015-11-17 22:37 ` [PATCH RFC 18/27] drivers: cpu-pd: Add PM Domain governor for CPUs Lina Iyer
2015-11-18 18:42 ` Lorenzo Pieralisi
2015-11-19 8:50 ` Marc Titinger
2015-11-20 17:39 ` Lina Iyer
2015-11-19 23:52 ` Kevin Hilman
2015-11-20 16:21 ` Lorenzo Pieralisi
2015-11-20 16:42 ` Lina Iyer
2015-11-20 0:03 ` Kevin Hilman
2015-11-17 22:37 ` [PATCH RFC 19/27] drivers: cpu-pd: Invoke CPU PM runtime on hotplug Lina Iyer
2015-11-17 22:37 ` [PATCH RFC 20/27] Documentation: ARM: topology: 'cluster' property for cluster nodes Lina Iyer
2015-11-17 22:37 ` [PATCH RFC 21/27] drivers: cpu-pd: Parse topology to setup CPU PM domains Lina Iyer
2015-12-07 14:54 ` Lorenzo Pieralisi
2015-12-08 18:05 ` Lina Iyer
2015-12-10 18:11 ` Lorenzo Pieralisi
2015-12-11 9:04 ` Geert Uytterhoeven
2015-12-11 20:51 ` Lina Iyer
2015-11-17 22:37 ` [PATCH RFC 22/27] drivers: firmware: PSCI: Export psci_has_ext_power_state() Lina Iyer
2015-11-17 22:37 ` [PATCH RFC 23/27] ARM64: psci: Support cluster idle states for OS-Initated Lina Iyer
2015-11-17 22:37 ` [PATCH RFC 24/27] arm64: dts: Add Qualcomm MSM8916, MTP8916, APQ8016, SBC8016 ids Lina Iyer
2015-11-17 22:37 ` [PATCH RFC 25/27] devicetree: bindings: Document qcom, msm-id and qcom, board-id Lina Iyer
2015-11-19 14:36 ` Rob Herring
2015-11-19 15:36 ` [PATCH RFC 25/27] devicetree: bindings: Document qcom, msm-id and qcom,board-id Lina Iyer
2015-11-17 22:37 ` [PATCH RFC 26/27] ARM64: dts: Add PSCI cpuidle support for MSM8916 Lina Iyer
2015-11-17 22:37 ` [PATCH RFC 27/27] ARM64: dts: Define CPU power domain " Lina Iyer
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