linux-kernel - Re: [PATCH v10 09/10] fs/resctrl: Introduce interface to modify io

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Message-ID: <6448dc8f-e045-456b-988b-90a6868dec9f@intel.com>
Date: Fri, 24 Oct 2025 16:43:52 -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 09/10] fs/resctrl: Introduce interface to modify
 io_alloc capacity bitmasks

Hi Babu,

On 10/21/25 4:54 PM, Babu Moger wrote:
> The io_alloc feature in resctrl enables system software to configure the
> portion of the cache allocated for I/O traffic. When supported, the
> io_alloc_cbm file in resctrl provides access to capacity bitmasks (CBMs)
> allocated for I/O devices.
> 
> Enable users to modify io_alloc CBMs by writing to the io_alloc_cbm resctrl
> file when the io_alloc feature is enabled.
> 
> Mirror the CBMs between CDP_CODE and CDP_DATA when CDP is enabled to present
> consistent I/O allocation information to user space.
> 
> Signed-off-by: Babu Moger <babu.moger@....com>
> ---

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

Reinette