linux-kernel - Re: [PATCH v10 07/10] fs/resctrl: Introduce interface to display io

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Message-ID: <003d4e31-76df-43ed-ac23-9f6de7ca44cb@intel.com>
Date: Fri, 24 Oct 2025 16:43:35 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: Babu Moger <babu.moger@....com>, <tony.luck@...el.com>,
	<tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
	<dave.hansen@...ux.intel.com>
CC: <corbet@....net>, <Dave.Martin@....com>, <james.morse@....com>,
	<x86@...nel.org>, <hpa@...or.com>, <akpm@...ux-foundation.org>,
	<paulmck@...nel.org>, <rdunlap@...radead.org>, <pmladek@...e.com>,
	<kees@...nel.org>, <arnd@...db.de>, <fvdl@...gle.com>, <seanjc@...gle.com>,
	<pawan.kumar.gupta@...ux.intel.com>, <xin@...or.com>,
	<thomas.lendacky@....com>, <sohil.mehta@...el.com>, <jarkko@...nel.org>,
	<chang.seok.bae@...el.com>, <ebiggers@...gle.com>,
	<elena.reshetova@...el.com>, <ak@...ux.intel.com>,
	<mario.limonciello@....com>, <perry.yuan@....com>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<peternewman@...gle.com>
Subject: Re: [PATCH v10 07/10] fs/resctrl: Introduce interface to display
 io_alloc CBMs

Hi Babu,

On 10/21/25 4:54 PM, Babu Moger wrote:
> Introduce the "io_alloc_cbm" resctrl file to display the capacity bitmasks
> (CBMs) that represent the portions of each cache instance allocated
> for I/O traffic on a cache resource that supports the "io_alloc" feature.
> 
> io_alloc_cbm resides in the info directory of a cache resource, for example,
> /sys/fs/resctrl/info/L3/. Since the resource name is part of the path, it
> is not necessary to display the resource name as done in the schemata file.
> 
> When CDP is enabled, io_alloc routes traffic using the highest CLOSID
> associated with the CDP_CODE resource and that CLOSID becomes unusable for
> the CDP_DATA resource. The highest CLOSID of CDP_CODE and CDP_DATA resources
> will be kept in sync to ensure consistent user interface. In preparation for
> this, access the CBMs for I/O traffic through highest CLOSID of either
> CDP_CODE or CDP_DATA resource.
> 
> Signed-off-by: Babu Moger <babu.moger@....com>
> ---

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

Reinette