Re: [PATCH v5 00/21] x86/resctrl: Make resctrl_arch_rmid_read() return values in bytes

[James Morse]

Hi Reinette,

On 23/08/2022 18:20, Reinette Chatre wrote:
> On 6/22/2022 9:46 AM, James Morse wrote:
>> The aim of this series is to insert a split between the parts of the monitor
>> code that the architecture must implement, and those that are part of the
>> resctrl filesystem. The eventual aim is to move all filesystem parts out
>> to live in /fs/resctrl, so that resctrl can be wired up for MPAM.
>>
>> What's MPAM? See the cover letter of a previous series. [1]
>>
>> The series adds domain online/offline callbacks to allow the filesystem to
>> manage some of its structures itself, then moves all the 'mba_sc' behaviour
>> to be part of the filesystem.
>> This means another architecture doesn't need to provide an mbps_val array.
>> As its all software, the resctrl filesystem should be able to do this without
>> any help from the architecture code.
>>
>> Finally __rmid_read() is refactored to be the API call that the architecture
>> provides to read a counter value. All the hardware specific overflow detection,
>> scaling and value correction should occur behind this helper.
>>
> 
> Thank you for your patience as I was offline for a while. 

No problem,


> This series looks good to me. I have one remaining comment that I provided
> in reply to "[07/21] x86/resctrl: Abstract and use supports_mba_mbps()" where
> it seems to me that an existing issue could easily be addressed in the new
> function. 

Yup, that made sense to me.


> I do not have tests for the software controller and only did basic sanity
> checks. It would be great if the folks using this feature could test this
> series.
> 
> Thank you very much. From my side it looks good:
> 
> Reviewed-by: Reinette Chatre <reinette.chatre@xxxxxxxxx>


Thanks!

James