linux-kernel - Re: [PATCH v10 10/10] fs/resctrl: Update bit_usage to reflect io

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Message-ID: <a0c92e00-447c-44dd-b7a2-895534cc94dc@intel.com>
Date: Fri, 24 Oct 2025 16:44:04 -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 10/10] fs/resctrl: Update bit_usage to reflect
 io_alloc

Hi Babu,

On 10/21/25 4:54 PM, Babu Moger wrote:
> The "shareable_bits" and "bit_usage" resctrl files associated with cache
> resources give insight into how instances of a cache is used.
> 
> Update the annotated capacity bitmasks displayed by "bit_usage" to include the
> cache portions allocated for I/O via the "io_alloc" feature. "shareable_bits"
> is a global bitmask of shareable cache with I/O and can thus not present the
> per-domain I/O allocations possible with the "io_alloc" feature. Revise the
> "shareable_bits" documentation to direct users to "bit_usage" for accurate
> cache usage information.
> 
> Signed-off-by: Babu Moger <babu.moger@....com>
> ---

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

Reinette