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Re: [PATCH] xen/arm: Allow setting the number of CPUs to activate at runtime
- To: Michal Orzel <Michal.Orzel@xxxxxxx>
- From: Bertrand Marquis <Bertrand.Marquis@xxxxxxx>
- Date: Mon, 30 May 2022 09:09:28 +0000
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- Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Delivery-date: Mon, 30 May 2022 09:09:55 +0000
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- Thread-topic: [PATCH] xen/arm: Allow setting the number of CPUs to activate at runtime
Hi Michal,
> On 23 May 2022, at 10:13, Michal Orzel <Michal.Orzel@xxxxxxx> wrote:
>
> Introduce a command line parameter "maxcpus" on Arm to allow adjusting
> the number of CPUs to activate. Currently the limit is defined by the
> config option CONFIG_NR_CPUS. Such parameter already exists on x86.
>
> Define a parameter "maxcpus" and a corresponding static variable
> max_cpus in Arm smpboot.c. Modify function smp_get_max_cpus to take
> max_cpus as a limit and to return proper unsigned int instead of int.
>
> Take the opportunity to remove redundant variable cpus from start_xen
> function and to directly assign the return value from smp_get_max_cpus
> to nr_cpu_ids (global variable in Xen used to store the number of CPUs
> actually activated).
>
> Signed-off-by: Michal Orzel <michal.orzel@xxxxxxx>
With the warning added in the documentation (which is ok to do on commit):
Reviewed-by: Bertrand Marquis <bertrand.marquis@xxxxxxx>
Cheers
Bertrand
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