linux-kernel - Re: [PATCH v17 32/33] x86/resctrl: Configure mbm

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Message-ID: <58cde22c-21f4-4b82-8f64-495fefe522e3@intel.com>
Date: Tue, 2 Sep 2025 20:13:03 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: Babu Moger <babu.moger@....com>, <corbet@....net>, <tony.luck@...el.com>,
	<tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
	<dave.hansen@...ux.intel.com>
CC: <Dave.Martin@....com>, <james.morse@....com>, <x86@...nel.org>,
	<hpa@...or.com>, <akpm@...ux-foundation.org>, <rostedt@...dmis.org>,
	<paulmck@...nel.org>, <pawan.kumar.gupta@...ux.intel.com>, <kees@...nel.org>,
	<arnd@...db.de>, <fvdl@...gle.com>, <seanjc@...gle.com>,
	<thomas.lendacky@....com>, <yosry.ahmed@...ux.dev>, <xin@...or.com>,
	<sohil.mehta@...el.com>, <kai.huang@...el.com>, <xiaoyao.li@...el.com>,
	<peterz@...radead.org>, <mario.limonciello@....com>, <xin3.li@...el.com>,
	<perry.yuan@....com>, <chang.seok.bae@...el.com>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<peternewman@...gle.com>, <eranian@...gle.com>, <gautham.shenoy@....com>
Subject: Re: [PATCH v17 32/33] x86/resctrl: Configure mbm_event mode if
 supported

Hi Babu,

On 8/14/25 7:25 PM, 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.
> 
> Enable mbm_event mode, known as ABMC (Assignable Bandwidth Monitoring
> Counters) on AMD, by default if the system supports it.
> 
> Update ABMC across all logical processors within the resctrl domain to
> ensure proper functionality.
> 
> Signed-off-by: Babu Moger <babu.moger@....com>
> ---

Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>

Reinette