linux-kernel - Re: [PATCH v16 33/34] x86/resctrl: Configure mbm

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Message-ID: <5b8decc6-56d3-4740-badb-32017239f3ca@amd.com>
Date: Tue, 12 Aug 2025 14:21:02 -0500
From: "Moger, Babu" <babu.moger@....com>
To: Reinette Chatre <reinette.chatre@...el.com>, corbet@....net,
 tony.luck@...el.com, james.morse@....com, tglx@...utronix.de,
 mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com
Cc: Dave.Martin@....com, x86@...nel.org, hpa@...or.com,
 akpm@...ux-foundation.org, paulmck@...nel.org, rostedt@...dmis.org,
 Neeraj.Upadhyay@....com, david@...hat.com, arnd@...db.de, fvdl@...gle.com,
 seanjc@...gle.com, jpoimboe@...nel.org, pawan.kumar.gupta@...ux.intel.com,
 xin@...or.com, manali.shukla@....com, tao1.su@...ux.intel.com,
 sohil.mehta@...el.com, kai.huang@...el.com, xiaoyao.li@...el.com,
 peterz@...radead.org, xin3.li@...el.com, kan.liang@...ux.intel.com,
 mario.limonciello@....com, thomas.lendacky@....com, perry.yuan@....com,
 gautham.shenoy@....com, chang.seok.bae@...el.com, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org, peternewman@...gle.com, eranian@...gle.com
Subject: Re: [PATCH v16 33/34] x86/resctrl: Configure mbm_event mode if
 supported

Hi Reinette,

On 7/30/25 15:11, Reinette Chatre wrote:
> Hi Babu,
> 
> On 7/25/25 11:29 AM, Babu Moger wrote:
>> Configure mbm_event mode on AMD platforms. On AMD platforms, it is
>> recommended to use the mbm_event mode, if supported, to prevent the
>> hardware from resetting counters between reads. This can result in
>> misleading values or display "Unavailable" if no counter is assigned
>> to the event.
>>
>> The mbm_event mode, referred to as ABMC (Assignable Bandwidth Monitoring
>> Counters) on AMD, is enabled by default when supported by the system.
> 
> needs imperative
> 

Sure.

>>
>> Update ABMC across all logical processors within the resctrl domain to
>> ensure proper functionality.
>>
>> Signed-off-by: Babu Moger <babu.moger@....com>
>> ---
> 
> Patch looks good.
> 
-- 
Thanks
Babu Moger