From: Alex Shi <alex.shi@linaro.org>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
open list <linux-kernel@vger.kernel.org>
Cc: linux-pm@vger.kernel.org, Ulf Hansson <ulf.hansson@linaro.org>,
Daniel Lezcano <daniel.lezcano@linaro.org>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>
Subject: Re: [PATCH 2/4] cpu: expose pm_qos_resume_latency for each cpu
Date: Tue, 13 Sep 2016 21:57:28 +0800 [thread overview]
Message-ID: <57D805C8.2060903@linaro.org> (raw)
In-Reply-To: <57C7A597.4050001@linaro.org>
Cc Rafael,
This patchset is quit simple and straight. Is there any concern or
hesitate on it?
Thanks
Alex
On 09/01/2016 11:50 AM, Alex Shi wrote:
>
> Few commits and patch changed according to Greg's comments.
>
> Regards
> Alex
>
> ====
>
> From 186c534b0b8b9649fbfce05b0b4f90f764c571a4 Mon Sep 17 00:00:00 2001
> From: Alex Shi <alex.shi@linaro.org>
> Date: Tue, 16 Aug 2016 15:29:01 +0800
> Subject: [PATCH 2/4] cpu: expose pm_qos_resume_latency for each cpu
>
> Adding /sys/devices/system/cpu/cpux/power/pm_qos_resume_latency_us for
> each of cpus. The pm_qos_resume_latency usage defined in
> Documentation/ABI/testing/sysfs-devices-power
>
> The cpu-dma PM QoS constraint impacts all the cpus in the system. There
> is no way to let the user to choose a PM QoS constraint per cpu.
>
> The following patch exposes to the userspace a per cpu based sysfs file
> in order to let the userspace to change the value of the PM QoS latency
> constraint.
>
> This change is inoperative in its form and the cpuidle governors have to
> take into account the per cpu latency constraint in addition to the
> global cpu-dma latency constraint in order to operate properly.
>
> Signed-off-by: Alex Shi <alex.shi@linaro.org>
> To: linux-kernel@vger.kernel.org
> To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: linux-pm@vger.kernel.org
> Cc: Ulf Hansson <ulf.hansson@linaro.org>
> Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
> ---
> drivers/base/cpu.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
> index 4c28e1a..2c3b359 100644
> --- a/drivers/base/cpu.c
> +++ b/drivers/base/cpu.c
> @@ -17,6 +17,7 @@
> #include <linux/of.h>
> #include <linux/cpufeature.h>
> #include <linux/tick.h>
> +#include <linux/pm_qos.h>
>
> #include "base.h"
>
> @@ -376,6 +377,7 @@ int register_cpu(struct cpu *cpu, int num)
>
> per_cpu(cpu_sys_devices, num) = &cpu->dev;
> register_cpu_under_node(num, cpu_to_node(num));
> + dev_pm_qos_expose_latency_limit(&cpu->dev, 0);
>
> return 0;
> }
>
next prev parent reply other threads:[~2016-09-13 13:57 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-25 8:42 [PATCH 1/4] cpu: clean up register_cpu func Alex Shi
2016-08-25 8:42 ` [PATCH 2/4] cpu: expose pm_qos_resume_latency for each cpu Alex Shi
2016-08-31 10:45 ` Alex Shi
2016-08-31 13:18 ` Greg Kroah-Hartman
2016-09-01 3:39 ` Alex Shi
2016-09-01 3:45 ` Alex Shi
2016-09-01 3:50 ` Alex Shi
2016-09-01 9:26 ` Ulf Hansson
2016-09-13 1:04 ` Alex Shi
2016-09-13 7:17 ` Ulf Hansson
2016-09-13 13:57 ` Alex Shi [this message]
2016-08-25 8:42 ` [PATCH 3/4] cpuidle/menu: stop seeking deeper idle if current state is too deep Alex Shi
2016-08-31 10:45 ` Alex Shi
2016-09-13 14:01 ` Alex Shi
2016-08-25 8:42 ` [PATCH 4/4] cpuidle/menu: add per cpu pm_qos_resume_latency consideration Alex Shi
2016-08-31 10:46 ` Alex Shi
2016-09-13 14:02 ` Alex Shi
2016-09-13 22:10 ` Rafael J. Wysocki
2016-09-14 8:28 ` Vincent Guittot
2016-09-23 1:36 ` Rafael J. Wysocki
2016-09-23 4:58 ` Alex Shi
2016-08-31 10:45 ` [PATCH 1/4] cpu: clean up register_cpu func Alex Shi
2016-08-31 13:17 ` Greg Kroah-Hartman
-- strict thread matches above, loose matches on Subject: below --
2016-08-19 8:25 Alex Shi
2016-08-19 8:25 ` [PATCH 2/4] cpu: expose pm_qos_resume_latency for each cpu Alex Shi
2016-08-22 4:49 ` Alex Shi
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