* [PATCH] docs: Document possible_cpus parameter
@ 2024-02-03 15:21 Guilherme G. Piccoli
2024-02-03 17:19 ` Randy Dunlap
2024-02-05 17:21 ` Jonathan Corbet
0 siblings, 2 replies; 3+ messages in thread
From: Guilherme G. Piccoli @ 2024-02-03 15:21 UTC (permalink / raw)
To: linux-doc, corbet
Cc: linux-kernel, linux-s390, rdunlap, tglx, mingo, bp, dave.hansen,
x86, hpa, hca, gor, agordeev, borntraeger, svens, kernel,
kernel-dev, Guilherme G. Piccoli, Changwoo Min
The number of possible CPUs is set be kernel in early boot time through
some discovery mechanisms, like ACPI in x86. We have a parameter both
in x86 and S390 to override that - there are some cases of BIOSes exposing
more possible CPUs than the available ones, so this parameter is a good
testing mechanism, but for some reason wasn't mentioned so far in the
kernel parameters guide - let's fix that.
Cc: Changwoo Min <changwoo@igalia.com>
Signed-off-by: Guilherme G. Piccoli <gpiccoli@igalia.com>
---
Documentation/admin-guide/kernel-parameters.txt | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 31b3a25680d0..e553740190ea 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -4644,6 +4644,11 @@
may be specified.
Format: <port>,<port>....
+ possible_cpus= [SMP,S390,X86]
+ Format: <unsigned int>
+ Set the number of possible CPUs, overriding the
+ regular discovery mechanisms (such as ACPI/FW, etc).
+
powersave=off [PPC] This option disables power saving features.
It specifically disables cpuidle and sets the
platform machine description specific power_save
--
2.43.0
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] docs: Document possible_cpus parameter
2024-02-03 15:21 [PATCH] docs: Document possible_cpus parameter Guilherme G. Piccoli
@ 2024-02-03 17:19 ` Randy Dunlap
2024-02-05 17:21 ` Jonathan Corbet
1 sibling, 0 replies; 3+ messages in thread
From: Randy Dunlap @ 2024-02-03 17:19 UTC (permalink / raw)
To: Guilherme G. Piccoli, linux-doc, corbet
Cc: linux-kernel, linux-s390, tglx, mingo, bp, dave.hansen, x86, hpa,
hca, gor, agordeev, borntraeger, svens, kernel, kernel-dev,
Changwoo Min
On 2/3/24 07:21, Guilherme G. Piccoli wrote:
> The number of possible CPUs is set be kernel in early boot time through
> some discovery mechanisms, like ACPI in x86. We have a parameter both
> in x86 and S390 to override that - there are some cases of BIOSes exposing
> more possible CPUs than the available ones, so this parameter is a good
> testing mechanism, but for some reason wasn't mentioned so far in the
> kernel parameters guide - let's fix that.
>
> Cc: Changwoo Min <changwoo@igalia.com>
> Signed-off-by: Guilherme G. Piccoli <gpiccoli@igalia.com>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Thanks.
> ---
> Documentation/admin-guide/kernel-parameters.txt | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 31b3a25680d0..e553740190ea 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -4644,6 +4644,11 @@
> may be specified.
> Format: <port>,<port>....
>
> + possible_cpus= [SMP,S390,X86]
> + Format: <unsigned int>
> + Set the number of possible CPUs, overriding the
> + regular discovery mechanisms (such as ACPI/FW, etc).
> +
> powersave=off [PPC] This option disables power saving features.
> It specifically disables cpuidle and sets the
> platform machine description specific power_save
--
#Randy
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] docs: Document possible_cpus parameter
2024-02-03 15:21 [PATCH] docs: Document possible_cpus parameter Guilherme G. Piccoli
2024-02-03 17:19 ` Randy Dunlap
@ 2024-02-05 17:21 ` Jonathan Corbet
1 sibling, 0 replies; 3+ messages in thread
From: Jonathan Corbet @ 2024-02-05 17:21 UTC (permalink / raw)
To: Guilherme G. Piccoli, linux-doc
Cc: linux-kernel, linux-s390, rdunlap, tglx, mingo, bp, dave.hansen,
x86, hpa, hca, gor, agordeev, borntraeger, svens, kernel,
kernel-dev, Guilherme G. Piccoli, Changwoo Min
"Guilherme G. Piccoli" <gpiccoli@igalia.com> writes:
> The number of possible CPUs is set be kernel in early boot time through
> some discovery mechanisms, like ACPI in x86. We have a parameter both
> in x86 and S390 to override that - there are some cases of BIOSes exposing
> more possible CPUs than the available ones, so this parameter is a good
> testing mechanism, but for some reason wasn't mentioned so far in the
> kernel parameters guide - let's fix that.
>
> Cc: Changwoo Min <changwoo@igalia.com>
> Signed-off-by: Guilherme G. Piccoli <gpiccoli@igalia.com>
> ---
> Documentation/admin-guide/kernel-parameters.txt | 5 +++++
> 1 file changed, 5 insertions(+)
Applied, thanks.
jon
^ permalink raw reply [flat|nested] 3+ messages in thread
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2024-02-03 17:19 ` Randy Dunlap
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