linux-kernel - Re: [PATCH v21 12/18] x86/resctrl: Create Sub-NUMA Cluster (SNC) monitor files

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Date: Tue, 25 Jun 2024 16:30:23 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: Tony Luck <tony.luck@...el.com>, Fenghua Yu <fenghua.yu@...el.com>,
	"Maciej Wieczor-Retman" <maciej.wieczor-retman@...el.com>, Peter Newman
	<peternewman@...gle.com>, James Morse <james.morse@....com>, Babu Moger
	<babu.moger@....com>, Drew Fustini <dfustini@...libre.com>, Dave Martin
	<Dave.Martin@....com>
CC: <x86@...nel.org>, <linux-kernel@...r.kernel.org>,
	<patches@...ts.linux.dev>
Subject: Re: [PATCH v21 12/18] x86/resctrl: Create Sub-NUMA Cluster (SNC)
 monitor files

Hi Tony,

On 6/21/24 3:38 PM, Tony Luck wrote:
> When SNC mode is enabled, create subdirectories and files to monitor
> at the SNC node granularity. Legacy behavior is preserved by tagging
> the monitor files at the L3 granularity with the "sum" attribute.
> When the user reads these files the kernel will read monitor data
> from all SNC nodes that share the same L3 cache instance and return
> the aggregated value to the user.
> 
> Note that the "domid" field for files that must sum across SNC domains
> has the L3 cache instance id, while non-summing files use the domain id.
> 
> The "sum" files do not need to make a call to mon_event_read() to
> initialize the MBM counters. This will be handled by initializing the
> individual SNC nodes that share the L3.
> 
> Signed-off-by: Tony Luck <tony.luck@...el.com>
> ---

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

Reinette