linux-kernel - Re: [RFC PATCH v3 03/17] x86/resctrl: Detect Assignable Bandwidth Monitoring feature details

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Message-ID: <753844b6-b68d-4b05-89b0-3ac36e1c8564@intel.com>
Date: Tue, 7 May 2024 13:27:00 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: <babu.moger@....com>, <corbet@....net>, <fenghua.yu@...el.com>,
	<tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
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	<rdunlap@...radead.org>, <tj@...nel.org>, <peterz@...radead.org>,
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Subject: Re: [RFC PATCH v3 03/17] x86/resctrl: Detect Assignable Bandwidth
 Monitoring feature details

Hi Babu,

On 5/6/2024 12:09 PM, Moger, Babu wrote:
> On 5/3/24 18:26, Reinette Chatre wrote:
>> On 3/28/2024 6:06 PM, Babu Moger wrote:

..

>>> + * @mbm_assign_cntrs:	Maximum number of assignable counters
>>>   */
>>>  struct rdt_resource {
>>>  	int			rid;
>>> @@ -188,6 +198,8 @@ struct rdt_resource {
>>>  	struct list_head	evt_list;
>>>  	unsigned long		fflags;
>>>  	bool			cdp_capable;
>>> +	bool			mbm_assign_capable;
>>> +	u32                     mbm_assign_cntrs;
>>>  };
>>
>> Please check tabs vs spaces (in this whole series please).
> 
> Sure. Will do.
> 
>>
>> I'm thinking that a new "MBM specific" struct within
>> struct rdt_resource will be helpful to clearly separate the MBM related
>> data. This will be similar to struct resctrl_cache for 
>> cache allocation and struct resctrl_membw for memory bandwidth
>> allocation.
> 
> Did you mean to move all the fields for monitoring to move to new struct?
> 
> Struct resctrl_mbm {
>           int                     num_rmid;
>           bool                    mbm_assign_capable;
>           u32                     mbm_assign_cntrs;
> }:
> 

Indeed, so not actually MBM specific but monitoring specific as you state (with
appropriate naming?). This is purely to help organize data within struct rdt_resource
and (similar to struct resctrl_cache and struct resctrl_membw) not a new
structure expected to be passed around. I think evt_list can also be a member.

Reinette