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

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Message-ID: <b0380521-75f8-4f88-8dd5-c4746748e628@intel.com>
Date: Thu, 13 Feb 2025 22:34:38 -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)

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?

Reinette