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Re: [PATCH 4/5] xen/cpupool: Create different cpupools at boot time
- To: Juergen Gross <jgross@xxxxxxxx>
- From: Luca Fancellu <luca.fancellu@xxxxxxx>
- Date: Wed, 16 Feb 2022 12:37:37 +0000
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- Cc: Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Wei Chen <wei.chen@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Wei Liu <wl@xxxxxxx>, Dario Faggioli <dfaggioli@xxxxxxxx>
- Delivery-date: Wed, 16 Feb 2022 12:38:07 +0000
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> On 16 Feb 2022, at 06:18, Juergen Gross <jgross@xxxxxxxx> wrote:
>
> On 15.02.22 18:56, Luca Fancellu wrote:
>>> On 15 Feb 2022, at 10:48, Juergen Gross <jgross@xxxxxxxx> wrote:
>>>
>>> On 15.02.22 11:15, Luca Fancellu wrote:
>>>> Introduce an architecture specific way to create different cpupools
>>>> at boot time, this is particularly useful on ARM big.LITTLE system
>>>> where there might be the need to have different cpupools for each type
>>>> of core, but also systems using NUMA can have different cpu pools for
>>>> each node.
>>>> The feature on arm relies on a specification of the cpupools from the
>>>> device tree to build pools and assign cpus to them.
>>>> Documentation is created to explain the feature.
>>>> Signed-off-by: Luca Fancellu <luca.fancellu@xxxxxxx>
>>>
>>> IIRC I suggested to have the core functionality in common code in order
>>> to allow using boot time cpupool creation e.g. via commandline for x86,
>>> too.
>> Yes, however I think the parser to handle everything by command line would
>> be huge due to input sanitisation and not easy enough as the DT, however
>> I see Hyperlaunch has plans to use DT on x86 so I guess it would be ok to
>> make
>> this feature common once the DT is available also on x86.
>
> Everything not being explicitly specific to Arm should be in common
> code. Think of the work in progress for Risc-V.
Ok I will put it in common and I will make the feature depend on
HAS_DEVICE_TREE.
Thank you.
Cheers,
Luca
>
>
> Juergen
> <OpenPGP_0xB0DE9DD628BF132F.asc>
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