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Message-ID: <674c91d8-7349-425f-86c6-fe03716c15ac@amd.com> Date: Mon, 3 Nov 2025 15:36:14 -0600 From: Babu Moger <bmoger@....com> To: Reinette Chatre <reinette.chatre@...el.com>, 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, feng.tang@...ux.alibaba.com Subject: Re: [PATCH v11 06/10] fs/resctrl: Add user interface to enable/disable io_alloc feature Hi Reinette, On 11/3/25 13:05, Reinette Chatre wrote: > Hi Babu, > > On 10/30/25 10:15 AM, Babu Moger wrote: > > ... > >> diff --git a/Documentation/filesystems/resctrl.rst b/Documentation/filesystems/resctrl.rst >> index 108995640ca5..89e856e6892c 100644 >> --- a/Documentation/filesystems/resctrl.rst >> +++ b/Documentation/filesystems/resctrl.rst >> @@ -152,6 +152,29 @@ related to allocation: >> "not supported": >> Support not available for this resource. >> >> + The feature can be modified by writing to the interface, for example: >> + >> + To enable: >> + # echo 1 > /sys/fs/resctrl/info/L3/io_alloc >> + >> + To disable: >> + # echo 0 > /sys/fs/resctrl/info/L3/io_alloc >> + > Above examples are missing the '::' that will format them as fixed width text blocks > used for these shell examples. Sure. Will update: diff --git a/Documentation/filesystems/resctrl.rst b/Documentation/filesystems/resctrl.rst index ccc425b65b27..cd2214d8026e 100644 --- a/Documentation/filesystems/resctrl.rst +++ b/Documentation/filesystems/resctrl.rst @@ -161,10 +161,12 @@ related to allocation: The feature can be modified by writing to the interface, for example: - To enable: + To enable:: + # echo 1 > /sys/fs/resctrl/info/L3/io_alloc - To disable: + To disable:: + # echo 0 > /sys/fs/resctrl/info/L3/io_alloc The underlying implementation may reduce resources available to > >> + The underlying implementation may reduce resources available to >> + general (CPU) cache allocation. See architecture specific notes >> + below. Depending on usage requirements the feature can be enabled >> + or disabled. >> + >> + On AMD systems, io_alloc feature is supported by the L3 Smart >> + Data Cache Injection Allocation Enforcement (SDCIAE). The CLOSID for >> + io_alloc is the highest CLOSID supported by the resource. When >> + io_alloc is enabled, the highest CLOSID is dedicated to io_alloc and >> + no longer available for general (CPU) cache allocation. When CDP is >> + enabled, io_alloc routes I/O traffic using the highest CLOSID allocated >> + for the instruction cache (CDP_CODE), making this CLOSID no longer >> + available for general (CPU) cache allocation for both the CDP_CODE >> + and CDP_DATA resources. >> + >> Memory bandwidth(MB) subdirectory contains the following files >> with respect to allocation: >> > With the doc formatting fixed: > | Reviewed-by: Reinette Chatre <reinette.chatre@...el.com> > Thank you. Babu
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