linux-kernel - Re: [PATCH v11 00/23] x86/resctrl : Support AMD Assignable Bandwidth Monitoring Counters (ABMC)

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Message-ID: <27557e4d-c067-493c-817c-34fb2bb1fda0@intel.com>
Date: Thu, 13 Feb 2025 23:23:08 -0800
From: Reinette Chatre <reinette.chatre@...el.com>
To: "Luck, Tony" <tony.luck@...el.com>, Dave Martin <Dave.Martin@....com>,
	"Moger, Babu" <babu.moger@....com>
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 Stephane" <eranian@...gle.com>
Subject: Re: [PATCH v11 00/23] x86/resctrl : Support AMD Assignable Bandwidth
 Monitoring Counters (ABMC)



On 2/13/25 10:34 PM, Reinette Chatre wrote:
> Hi Tony,
> 
> On 2/13/25 10:39 AM, Luck, Tony wrote:
>>> Yes, although there is some hard-to-avoid fuzz about the precise
>>> meaning of "local" and "total".
>>
>> Things are only getting fuzzier with mixed DDR and CXL memory.
>>
>>> As Reinette pointed out, there is the also the possibility of adding
>>> new named events other than "local" and "total" if we find that some
>>> kinds of event don't fit these categories.
>>
>> Not just new names, new scopes too. Patches coming later this year
>> that would present:
>>
>> $ cd sys/fs/resctrl
>> $ cat mon_data/mon_PKG_00/llc_stalls
>> 779762866739
> 
> Thank you for catching this. To support this would not be possible for
> the current plan for mbm_assign_control since it does not have a way
> to distinguish domain X of the PKG resource from domain X of the L3 resource.
> Sounds like we need to include the resource name in the mbm_assign_control
> syntax?

ugh ... please ignore this message. This is not needed since mbm_assign_control
is already associated with the resource.

Reinette