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Fri, 11 Oct 2024 22:25:01 +0000 Received: from SJ2PR11MB7573.namprd11.prod.outlook.com ([fe80::61a:aa57:1d81:a9cf]) by SJ2PR11MB7573.namprd11.prod.outlook.com ([fe80::61a:aa57:1d81:a9cf%7]) with mapi id 15.20.8048.017; Fri, 11 Oct 2024 22:25:01 +0000 Message-ID: <87d9bf3c-4916-46fa-b07f-c44d5295ba35@intel.com> Date: Fri, 11 Oct 2024 15:24:57 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v8 07/25] x86/resctrl: Introduce the interface to display monitor mode To: , "Luck, Tony" CC: "corbet@lwn.net" , "Yu, Fenghua" , "tglx@linutronix.de" , "mingo@redhat.com" , "bp@alien8.de" , "dave.hansen@linux.intel.com" , "x86@kernel.org" , "hpa@zytor.com" , "paulmck@kernel.org" , "rdunlap@infradead.org" , "tj@kernel.org" , "peterz@infradead.org" , "yanjiewtw@gmail.com" , "kim.phillips@amd.com" , "lukas.bulwahn@gmail.com" , "seanjc@google.com" , "jmattson@google.com" , "leitao@debian.org" , "jpoimboe@kernel.org" , "Edgecombe, Rick P" , "kirill.shutemov@linux.intel.com" , "Joseph, Jithu" , "Huang, Kai" , "kan.liang@linux.intel.com" , "daniel.sneddon@linux.intel.com" , "pbonzini@redhat.com" , "sandipan.das@amd.com" , "ilpo.jarvinen@linux.intel.com" , "peternewman@google.com" , "Wieczor-Retman, Maciej" , "linux-doc@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "Eranian, Stephane" , "james.morse@arm.com" References: <4da658fa-3cea-4388-86f4-d4b0fb5f0903@amd.com> <71c79023-d39c-43e7-abc7-057864508edc@amd.com> From: Reinette Chatre Content-Language: en-US In-Reply-To: <71c79023-d39c-43e7-abc7-057864508edc@amd.com> Content-Type: text/plain; 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Hardware that does not support 'mbm_cntr_assign' mode will still >>>>> + allow more control or monitor groups than 'num_rmids' to be created. In >>>> >>>> Should that be s/num_rmids/num_mbm_cntrs/ ? >>> >>> It is actually num_rmids here as in default mode, num_rmid_cntrs are not >>> available. >> >> Babu, >> >> The code isn't working that way for me. I built & booted. Since I'm on >> an Intel machine without ABMC I'm in "default" mode. But I can't make >> more monitor groups that num_rmids. >> > > That is correct. We will have to change the text. How about? > > "default": > By default resctrl assumes each control and monitor group has a hardware > counter. Hardware that does not support 'mbm_cntr_assign' mode will still I think this is independent from whether hardware supports 'mbm_cntr_assign' mode since a user could enable 'default' mode on hardware that supports 'mbm_cntr_assign'. This snippet is thus more about what is meant by 'default' mode than what is supported by hardware. The docs already contain: "num_rmids": ... This is the upper bound for how many "CTRL_MON" + "MON" groups can be created. Neither of the 'mbm_assign_mode' options change this meaning of 'num_rmids' (i.e. no change in how many monitor groups can be created) so mentioning it in the 'default' portion but not in the 'mbm_cntr_assign' portion may create confusion. Perhaps it can be simplified to: In default mode resctrl assumes each CTRL_MON and MON group has a hardware counter. Reading mbm_total_bytes or mbm_local_bytes may report 'Unavailable' if there is no counter associated with that group. > allow to create control or monitor groups up to num_rmids supported. In > that case reading the mbm_total_bytes and mbm_local_bytes may report > 'Unavailable' if there is no counter associated with that group. > Reinette