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Re: [PATCH 4/5] xen/cpupool: Create different cpupools at boot time



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.


Juergen

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