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Tue, 9 Dec 2025 19:39:58 +0000 Message-ID: <34dfe97d-3aa0-4fc5-8f1d-3da5066a0b6c@intel.com> Date: Tue, 9 Dec 2025 11:39:56 -0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v15 11/32] x86,fs/resctrl: Handle events that can be read from any CPU To: Tony Luck , Fenghua Yu , "Maciej Wieczor-Retman" , Peter Newman , James Morse , Babu Moger , Drew Fustini , Dave Martin , Chen Yu CC: , , References: <20251204205404.12763-1-tony.luck@intel.com> <20251204205404.12763-12-tony.luck@intel.com> From: Reinette Chatre Content-Language: en-US In-Reply-To: <20251204205404.12763-12-tony.luck@intel.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4PR03CA0224.namprd03.prod.outlook.com (2603:10b6:303:b9::19) To SJ2PR11MB7573.namprd11.prod.outlook.com (2603:10b6:a03:4d2::10) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ2PR11MB7573:EE_|SN7PR11MB8027:EE_ X-MS-Office365-Filtering-Correlation-Id: 36d0296f-3b6f-428c-f884-08de375abcc7 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|1800799024|366016; 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This is true for x86 events accessed with an > MSR interface, but may not be true for other access methods such as MMIO. > > Introduce and use flag mon_evt::any_cpu, settable by architecture, that > indicates there are no restrictions on which CPU can read that event. I propose to append (something like): "This flag is not supported by the L3 event reading that requires to be run on a CPU that belongs to the L3 domain of the event being read." > diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c > index 340b847ab397..081ff659b52c 100644 > --- a/fs/resctrl/monitor.c > +++ b/fs/resctrl/monitor.c > @@ -518,10 +518,12 @@ static int __mon_event_count(struct rdtgroup *rdtgrp, struct rmid_read *rr) > { > switch (rr->r->rid) { > case RDT_RESOURCE_L3: > - if (rr->hdr) > + if (rr->hdr) { > + WARN_ON_ONCE(rr->evt->any_cpu); I appreciate that this addresses the feedback from v13 but it needs to be adjusted for the code changes made since then. This means that this warning applies to both __l3_mon_event_count() and __l3_mon_event_count_sum() , no? > return __l3_mon_event_count(rdtgrp, rr); > - else > + } else { > return __l3_mon_event_count_sum(rdtgrp, rr); > + } > default: > rr->err = -EINVAL; > return -EINVAL; Reinette