linux-kernel - Re: [PATCH v22 14/18] x86/resctrl: Fill out rmid_read structure for smp

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Date: Fri, 28 Jun 2024 13:54:21 -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 v22 14/18] x86/resctrl: Fill out rmid_read structure for
 smp_call*() to read a counter

Hi Tony,

On 6/27/24 1:38 PM, Tony Luck wrote:
> mon_event_read() fills out most fields of the struct rmid_read that is
> passed via an smp_call*() function to a CPU that is part of the correct
> domain to read the monitor counters.
> 
> With Sub-NUMA Cluster (SNC) mode there are now two cases to handle:
> 
> 1) Reading a file that returns a value for a single domain.
>     + Choose the CPU to execute from the domain cpu_mask
> 
> 2) Reading a file that must sum across domains sharing an L3 cache
>     instance.
>     + Indicate to called code that a sum is needed by passing a NULL
>       rdt_mon_domain pointer.
>     + Choose the CPU from the L3 shared_cpu_map.
> 
> Signed-off-by: Tony Luck <tony.luck@...el.com>
> ---

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

Reinette