From: Valentin Schneider <valentin.schneider@arm.com>
To: Thara Gopinath <thara.gopinath@linaro.org>
Cc: Russell King - ARM Linux admin <linux@armlinux.org.uk>,
Vincent Guittot <vincent.guittot@linaro.org>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: v5.7: new core kernel option missing help text
Date: Thu, 04 Jun 2020 16:38:40 +0100 [thread overview]
Message-ID: <jhja71ij0xr.mognet@arm.com> (raw)
In-Reply-To: <CALD-y_zQms4YQup2MgAfNhWSu=ewkhossHma2TKqfTcOFaG=uA@mail.gmail.com>
On 04/06/20 14:05, Thara Gopinath wrote:
> On Thu, 4 Jun 2020 at 06:56, Valentin Schneider <valentin.schneider@arm.com>
>>
>> Right, s/defconfig/arch kconfig/ or somesuch.
>>
>
> CPU_FREQ_THERMAL also has to be enabled for this to be effective.
> Since arm64 defconfig enables CPU_FREQ_THERMAL (by enabling CPU_THERMAL),
> it should be ok to enable it in arm64/Kconfig. (same with arm/Kconfig)
>
> Another option is to select the SCHED_THERMAL_PRESSURE when
> CPU_FREQ_THERMAL
> is enabled in drivers/thermal/Kconfig.
>
So interestingly while arch_set_thermal_pressure() (which just writes to a
pcpu variable) is defined in sched/core.c, arch_scale_thermal_pressure()
(which just returns aforementionned pcpu variable) is defined in
arch_topology...
I'm thinking at this point we might as well turn the
arch_scale_thermal_pressure() stub into what arch_topology does. This would
effectively let any architecture use thermal pressure, providing they use
cpufreq cooling.
If we want to keep changes contained to Kconfigs, for now I think the
safest would be:
---
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 16fbf74030fe..1e92080dc275 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -46,6 +46,7 @@ config ARM
select EDAC_ATOMIC_SCRUB
select GENERIC_ALLOCATOR
select GENERIC_ARCH_TOPOLOGY if ARM_CPU_TOPOLOGY
+ select SCHED_THERMAL_PRESSURE if GENERIC_ARCH_TOPOLOGY
select GENERIC_ATOMIC64 if CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI
select GENERIC_CLOCKEVENTS_BROADCAST if SMP
select GENERIC_CPU_AUTOPROBE
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 552d36cacc05..cc1944fbae51 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -98,6 +98,7 @@ config ARM64
select FRAME_POINTER
select GENERIC_ALLOCATOR
select GENERIC_ARCH_TOPOLOGY
+ select SCHED_THERMAL_PRESSURE
select GENERIC_CLOCKEVENTS
select GENERIC_CLOCKEVENTS_BROADCAST
select GENERIC_CPU_AUTOPROBE
diff --git a/init/Kconfig b/init/Kconfig
index 74a5ac65644f..ba846f6e805b 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -439,8 +439,11 @@ config HAVE_SCHED_AVG_IRQ
depends on SMP
config SCHED_THERMAL_PRESSURE
- bool "Enable periodic averaging of thermal pressure"
+ def_bool n
depends on SMP
+ depends on CPU_FREQ_THERMAL
+ help
+ <helpful thing here>
config BSD_PROCESS_ACCT
bool "BSD Process Accounting"
---
> Warm Regards
> Thara
next prev parent reply other threads:[~2020-06-04 15:38 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-03 17:31 v5.7: new core kernel option missing help text Russell King - ARM Linux admin
2020-06-03 18:00 ` Valentin Schneider
2020-06-03 18:45 ` Russell King - ARM Linux admin
2020-06-03 19:24 ` Vincent Guittot
2020-06-03 19:58 ` Russell King - ARM Linux admin
2020-06-03 20:22 ` Vincent Guittot
2020-06-03 20:25 ` Valentin Schneider
2020-06-04 0:48 ` Thara Gopinath
2020-06-04 9:26 ` Valentin Schneider
2020-06-04 9:29 ` Russell King - ARM Linux admin
2020-06-04 10:56 ` Valentin Schneider
[not found] ` <CALD-y_zQms4YQup2MgAfNhWSu=ewkhossHma2TKqfTcOFaG=uA@mail.gmail.com>
2020-06-04 15:38 ` Valentin Schneider [this message]
2020-06-04 22:22 ` Thara Gopinath
2020-06-05 7:03 ` Vincent Guittot
2020-06-05 9:46 ` Valentin Schneider
2020-06-05 8:15 ` Russell King - ARM Linux admin
2020-06-05 10:02 ` Valentin Schneider
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=jhja71ij0xr.mognet@arm.com \
--to=valentin.schneider@arm.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux@armlinux.org.uk \
--cc=thara.gopinath@linaro.org \
--cc=vincent.guittot@linaro.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).