Re: [PATCH v8 19/24] x86/resctrl: Add helpers for system wide mon/alloc capable

James Morse
2024-01-22T18:06:32Z

Hi Babu,

On 03/01/2024 19:43, Moger, Babu wrote:
> On 12/15/23 11:43, James Morse wrote:
>> resctrl reads rdt_alloc_capable or rdt_mon_capable to determine
>> whether any of the resources support the corresponding features.
>> resctrl also uses the static-keys that affect the architecture's
>> context-switch code to determine the same thing.
>>
>> This forces another architecture to have the same static-keys.
>>
>> As the static-key is enabled based on the capable flag, and none of
>> the filesystem uses of these are in the scheduler path, move the
>> capable flags behind helpers, and use these in the filesystem
>> code instead of the static-key.
>>
>> After this change, only the architecture code manages and uses
>> the static-keys to ensure __resctrl_sched_in() does not need
>> runtime checks.
>>
>> This avoids multiple architectures having to define the same
>> static-keys.
>>
>> Cases where the static-key implicitly tested if the resctrl
>> filesystem was mounted all have an explicit check added by a
>> previous patch.

> Reviewed-by: Babu Moger <babu.moger@amd.com>

Thanks!

James