linux-kernel - Re: [PATCH v12 12/26] x86/resctrl: Add data structures and definitions for ABMC assignment

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Message-ID: <cb71665f-a732-4fd9-90cf-213f5609e872@intel.com>
Date: Fri, 11 Apr 2025 14:01:28 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: Babu Moger <babu.moger@....com>, <tony.luck@...el.com>,
	<peternewman@...gle.com>
CC: <corbet@....net>, <tglx@...utronix.de>, <mingo@...hat.com>,
	<bp@...en8.de>, <dave.hansen@...ux.intel.com>, <x86@...nel.org>,
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	<maciej.wieczor-retman@...el.com>, <eranian@...gle.com>
Subject: Re: [PATCH v12 12/26] x86/resctrl: Add data structures and
 definitions for ABMC assignment

Hi Babu,

On 4/3/25 5:18 PM, Babu Moger wrote:
> The ABMC feature provides an option to the user to assign a hardware
> counter to an RMID, event pair and monitor the bandwidth as long as the
> counter is assigned. The bandwidth events will be tracked by the hardware
> until the user changes the configuration. Each resctrl group can configure
> maximum two counters, one for total event and one for local event.
> 
> The ABMC feature implements an MSR L3_QOS_ABMC_CFG (C000_03FDh).
> Configuration is done by setting the counter id, bandwidth source (RMID)
> and bandwidth configuration supported by BMEC (Bandwidth Monitoring Event
> Configuration).

Apart from the BMEC optimization in patch #1 and patch #2 this is the
first and only mention of BMEC dependency I see in this series while I do
not see implementation support for this. What am I missing?

Reinette