Re: [RESEND PATCH v4 04/15] fs/resctrl: Introduce kernel mode (kmode) data structures

[Reinette Chatre]

Hi Babu,

On 8/13/26 12:11 PM, Babu Moger wrote:
> On 8/13/26 13:18, Reinette Chatre wrote:
>> On 8/13/26 10:12 AM, Babu Moger wrote:
>>> On 8/13/26 10:55, Reinette Chatre wrote:

>>> The "inherit" is the default property if it is not explicitly set. Right?
>>
>> "property" is different from "kernel mode"
>>
>> Each "kernel mode" can have zero or more properties.
>> "inherit" is the default "kernel mode", but it could have a better/more descriptive name.
>> For example, "inherit_from_user" or ...?
> 
> Or "user_inherit_kernel" ?

nit: to me this sounds as though user space inherits from kernel.

Also keep in mind that the filename is already "kernel_mode" so any text would
be interpreted within that context so repeating "kernel" may not be necessary.


>>> # cat info/kernel_mode
>>> [inherit]
>>> assign_global_enable_per_cpu:ctrl=inherit;mon=inherit;group=uninitialized
>>>
>>>
>>> If the intention is to display all supported values for each
>>> property, then we should do so consistently for all properties. For
>>> example:
>>
>> No. The intention is not to display all supported values for properties of the
>> different kernel modes. Just display which properties are supported and what value resctrl
>> would use if the user enables that mode without providing a value for a particular
>> property. There may be properties that could have values for which it will
>> be difficult to provide all supported values.
>>
>> For example, if "kernel_mode" contains:
>>        # cat info/kernel_mode
>>        [inherit]
>>        assign_global_enable_per_cpu:ctrl=assign;mon=assign;group=//
>>
>> Then user space knows that if they enable "assign_global_enable_per_cpu" kernel mode
>> without providing any properties then all kernel work will use the default resource
>> group's allocation and monitoring. If that is not what user space wants then they
>> can change the value of only the properties they need to change.
> 
> That sounds reasonable.
> 
> When the group is bound to the global mode,
> 
> # cat info/kernel_mode
>   inherit
>   [assign_global_enable_per_cpu:ctrl=assign;group=ctrl1//]
> 
Looks good to me (while ignoring the "inherit" TBD naming change).

Reinette