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b=rpt6v+pN7t+jbR9fHnl+0wwm0//X+0i8nirmjtvThYMPJqLJ0op2AuGX4Yuox86fP7cBhvueCZ/Y6m69v+U2WaoUGqhcr2twgxhq/u1B6PMb/cX7FcBsfvWfAzsKJDiU9Y7yecw2k+bZmx2Vq02Z/lmD5qwmi7fFhVawWBLEwIU= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=amd.com; Received: from IA0PPF9A76BB3A6.namprd12.prod.outlook.com (2603:10b6:20f:fc04::bdc) by PH7PR12MB6562.namprd12.prod.outlook.com (2603:10b6:510:212::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9052.15; Fri, 22 Aug 2025 22:12:43 +0000 Received: from IA0PPF9A76BB3A6.namprd12.prod.outlook.com ([fe80::bed0:97a3:545d:af16]) by IA0PPF9A76BB3A6.namprd12.prod.outlook.com ([fe80::bed0:97a3:545d:af16%7]) with mapi id 15.20.9031.024; Fri, 22 Aug 2025 22:12:42 +0000 Message-ID: <67bd0215-8380-4207-bf97-bfd1d08d7faa@amd.com> Date: Fri, 22 Aug 2025 17:12:34 -0500 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v8 05/10] fs/resctrl: Introduce interface to display "io_alloc" support To: Reinette Chatre , corbet@lwn.net, tony.luck@intel.com, Dave.Martin@arm.com, james.morse@arm.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com Cc: x86@kernel.org, hpa@zytor.com, akpm@linux-foundation.org, paulmck@kernel.org, rostedt@goodmis.org, Neeraj.Upadhyay@amd.com, david@redhat.com, arnd@arndb.de, fvdl@google.com, seanjc@google.com, thomas.lendacky@amd.com, pawan.kumar.gupta@linux.intel.com, yosry.ahmed@linux.dev, sohil.mehta@intel.com, xin@zytor.com, kai.huang@intel.com, xiaoyao.li@intel.com, peterz@infradead.org, me@mixaill.net, mario.limonciello@amd.com, xin3.li@intel.com, ebiggers@google.com, ak@linux.intel.com, chang.seok.bae@intel.com, andrew.cooper3@citrix.com, perry.yuan@amd.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, manali.shukla@amd.com, gautham.shenoy@amd.com References: <1004ca25abe2f7460960f08bf9bacacbb5b07b3b.1754436586.git.babu.moger@amd.com> Content-Language: en-US From: "Moger, Babu" In-Reply-To: Content-Type: text/plain; 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File may only exist if the >> + system supports this feature on some of its cache resources. >> + >> + "disabled": >> + Portions of cache used for allocation of I/O traffic >> + cannot be configured. > To help distinguish difference between "disabled" and "not supported" it may be useful > to prepend something like "Resource supports "io_alloc" but the feature is disabled." Sure. Added it now. > >> + "enabled": >> + Portions of cache used for allocation of I/O traffic >> + can be configured using "io_alloc_cbm". >> + "not supported": >> + Support not available for this resource. >> + >> + 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, the io_alloc feature is supported by the L3 Smart > drop "the"? Sure. > >> + 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 (L3CODE), making this CLOSID no longer >> + available for general (CPU) cache allocation for both the L3CODE and >> + L3DATA resources. >> + >> Memory bandwidth(MB) subdirectory contains the following files >> with respect to allocation: >> > Code looks good to me. > Thanks Babu > >