From: Dietmar Eggemann <dietmar.eggemann@arm.com>
To: Mark Brown <broonie@kernel.org>
Cc: Juri Lelli <juri.lelli@arm.com>,
linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
peterz@infradead.org, vincent.guittot@linaro.org,
robh+dt@kernel.org, mark.rutland@arm.com, linux@arm.linux.org.uk,
sudeep.holla@arm.com, lorenzo.pieralisi@arm.com,
catalin.marinas@arm.com, will.deacon@arm.com,
morten.rasmussen@arm.com
Subject: Re: [PATCH v3 4/6] arm64: Enable dynamic CPU capacity initialization
Date: Mon, 8 Feb 2016 13:41:25 +0000 [thread overview]
Message-ID: <56B89B05.4090207@arm.com> (raw)
In-Reply-To: <20160208131320.GA7265@sirena.org.uk>
On 08/02/16 13:13, Mark Brown wrote:
> On Mon, Feb 08, 2016 at 12:28:39PM +0000, Dietmar Eggemann wrote:
>> On 03/02/16 11:59, Juri Lelli wrote:
>
>>> +bool arch_wants_init_cpu_capacity(void)
>>> +{
>>> + return true;
>
>> Isn't this a little bit too simple? Not every ARM/ARM64 platform is a
>> heterogeneous one.
>
> Does it matter? Is there any problem with doing the callibration and
> having it say that all the CPUs performs very similarly? My
> understanding was that this was simply saying it was worth checking to
> see if there was some asymmetry.
>
No, the calibration would work on any platform. I can see your point,
you want to have this feature not depend on dt.
WARNING: multiple messages have this Message-ID (diff)
From: dietmar.eggemann@arm.com (Dietmar Eggemann)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v3 4/6] arm64: Enable dynamic CPU capacity initialization
Date: Mon, 8 Feb 2016 13:41:25 +0000 [thread overview]
Message-ID: <56B89B05.4090207@arm.com> (raw)
In-Reply-To: <20160208131320.GA7265@sirena.org.uk>
On 08/02/16 13:13, Mark Brown wrote:
> On Mon, Feb 08, 2016 at 12:28:39PM +0000, Dietmar Eggemann wrote:
>> On 03/02/16 11:59, Juri Lelli wrote:
>
>>> +bool arch_wants_init_cpu_capacity(void)
>>> +{
>>> + return true;
>
>> Isn't this a little bit too simple? Not every ARM/ARM64 platform is a
>> heterogeneous one.
>
> Does it matter? Is there any problem with doing the callibration and
> having it say that all the CPUs performs very similarly? My
> understanding was that this was simply saying it was worth checking to
> see if there was some asymmetry.
>
No, the calibration would work on any platform. I can see your point,
you want to have this feature not depend on dt.
next prev parent reply other threads:[~2016-02-08 13:41 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-03 11:59 [PATCH v3 0/6] CPUs capacity information for heterogeneous systems Juri Lelli
2016-02-03 11:59 ` Juri Lelli
2016-02-03 11:59 ` [PATCH v3 1/6] ARM: initialize cpu_scale to its default Juri Lelli
2016-02-03 11:59 ` Juri Lelli
2016-02-03 11:59 ` [PATCH v3 2/6] drivers/cpufreq: implement init_cpu_capacity_default() Juri Lelli
2016-02-03 11:59 ` Juri Lelli
2016-02-03 21:04 ` Vincent Guittot
2016-02-03 21:04 ` Vincent Guittot
2016-02-04 9:36 ` Morten Rasmussen
2016-02-04 9:36 ` Morten Rasmussen
2016-02-04 12:03 ` Vincent Guittot
2016-02-04 12:03 ` Vincent Guittot
[not found] ` <CAKfTPtB4G3bP5N0hU6zWXJTddO34x3RnyGpp-4_otc8O=Wq2hw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-02-04 12:16 ` Juri Lelli
2016-02-04 12:16 ` Juri Lelli
2016-02-04 12:16 ` Juri Lelli
2016-02-04 12:35 ` Vincent Guittot
2016-02-04 12:35 ` Vincent Guittot
2016-02-04 14:13 ` Juri Lelli
2016-02-04 14:13 ` Juri Lelli
2016-02-04 15:44 ` Vincent Guittot
2016-02-04 15:44 ` Vincent Guittot
2016-02-04 15:46 ` Vincent Guittot
2016-02-04 15:46 ` Vincent Guittot
[not found] ` <CAKfTPtD4jTmUZoShGBm3oAFywizjp8jsEukmkeZU+x+zk-KZRA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-02-05 9:30 ` Juri Lelli
2016-02-05 9:30 ` Juri Lelli
2016-02-05 9:30 ` Juri Lelli
2016-02-09 15:54 ` Dietmar Eggemann
2016-02-09 15:54 ` Dietmar Eggemann
[not found] ` <56BA0BCA.6090903-5wv7dgnIgG8@public.gmane.org>
2016-02-10 14:25 ` Juri Lelli
2016-02-10 14:25 ` Juri Lelli
2016-02-10 14:25 ` Juri Lelli
2016-02-03 11:59 ` [PATCH v3 3/6] arm: Enable dynamic CPU capacity initialization Juri Lelli
2016-02-03 11:59 ` Juri Lelli
2016-02-03 11:59 ` Juri Lelli
2016-02-03 11:59 ` [PATCH v3 4/6] arm64: " Juri Lelli
2016-02-03 11:59 ` Juri Lelli
2016-02-08 12:28 ` Dietmar Eggemann
2016-02-08 12:28 ` Dietmar Eggemann
[not found] ` <56B889F7.306-5wv7dgnIgG8@public.gmane.org>
2016-02-08 13:13 ` Mark Brown
2016-02-08 13:13 ` Mark Brown
2016-02-08 13:13 ` Mark Brown
2016-02-08 13:41 ` Dietmar Eggemann [this message]
2016-02-08 13:41 ` Dietmar Eggemann
2016-02-03 11:59 ` [PATCH v3 5/6] arm: add sysfs cpu_capacity attribute Juri Lelli
2016-02-03 11:59 ` Juri Lelli
2016-02-03 11:59 ` [PATCH v3 6/6] arm64: " Juri Lelli
2016-02-03 11:59 ` Juri Lelli
2016-02-05 17:19 ` Dietmar Eggemann
2016-02-05 17:19 ` Dietmar Eggemann
[not found] ` <56B4D98F.3090103-5wv7dgnIgG8@public.gmane.org>
2016-02-05 17:49 ` Juri Lelli
2016-02-05 17:49 ` Juri Lelli
2016-02-05 17:49 ` Juri Lelli
[not found] ` <1454500799-18451-1-git-send-email-juri.lelli-5wv7dgnIgG8@public.gmane.org>
2016-02-08 23:59 ` [PATCH v3 0/6] CPUs capacity information for heterogeneous systems Steve Muckle
2016-02-08 23:59 ` Steve Muckle
2016-02-08 23:59 ` Steve Muckle
[not found] ` <56B92BF4.4030405-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2016-02-09 10:37 ` Juri Lelli
2016-02-09 10:37 ` Juri Lelli
2016-02-09 10:37 ` Juri Lelli
2016-02-09 17:30 ` Steve Muckle
2016-02-09 17:30 ` Steve Muckle
2016-02-09 17:40 ` Juri Lelli
2016-02-09 17:40 ` Juri Lelli
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