linux-kernel - Re: [RFC PATCH v3 00/17] x86/resctrl : Support AMD Assignable Bandwidth Monitoring Counters (ABMC)

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Date: Tue, 7 May 2024 13:26:34 -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>,
	<dave.hansen@...ux.intel.com>
CC: <x86@...nel.org>, <hpa@...or.com>, <paulmck@...nel.org>,
	<rdunlap@...radead.org>, <tj@...nel.org>, <peterz@...radead.org>,
	<yanjiewtw@...il.com>, <kim.phillips@....com>, <lukas.bulwahn@...il.com>,
	<seanjc@...gle.com>, <jmattson@...gle.com>, <leitao@...ian.org>,
	<jpoimboe@...nel.org>, <rick.p.edgecombe@...el.com>,
	<kirill.shutemov@...ux.intel.com>, <jithu.joseph@...el.com>,
	<kai.huang@...el.com>, <kan.liang@...ux.intel.com>,
	<daniel.sneddon@...ux.intel.com>, <pbonzini@...hat.com>,
	<sandipan.das@....com>, <ilpo.jarvinen@...ux.intel.com>,
	<peternewman@...gle.com>, <maciej.wieczor-retman@...el.com>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<eranian@...gle.com>, <james.morse@....com>
Subject: Re: [RFC PATCH v3 00/17] x86/resctrl : Support AMD Assignable
 Bandwidth Monitoring Counters (ABMC)

Hi Babu,

On 5/6/2024 10:18 AM, Moger, Babu wrote:
> On 5/3/24 18:24, Reinette Chatre wrote:
>> On 3/28/2024 6:06 PM, Babu Moger wrote:
>>
>>> a. Check if ABMC support is available
>>> 	#mount -t resctrl resctrl /sys/fs/resctrl/
>>>
>>> 	#cat /sys/fs/resctrl/info/L3_MON/mbm_assign
>>> 	[abmc] 
>>> 	legacy_mbm
>>>
>>> 	Linux kernel detected ABMC feature and it is enabled.
>>
>> Please note that this adds the "abmc" feature to the resctrl
>> *filesystem* that supports more architectures than just AMD. Calling the
>> resctrl filesystem feature "abmc" means that (a) AMD needs to be ok with
>> other architectures calling their features that are
>> similar-but-maybe-not-identical-to-AMD-ABMC "abmc", or (b) this needs
>> a new generic name.
> 
> It should not a problem if other architecture calling abmc for similar
> feature. But generic name is always better if there is a suggestion.

"should not a problem" does not instill confidence that AMD is
actually ok with this.

Reinette