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Fri, 18 Jul 2025 04:03:05 +0000 Message-ID: Date: Thu, 17 Jul 2025 21:03:02 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v15 33/34] fs/resctrl: Introduce the interface to switch between monitor modes To: Babu Moger , , , , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , References: <7869219493bb4cc5626da704c4f8f107fe7c8f69.1752013061.git.babu.moger@amd.com> From: Reinette Chatre Content-Language: en-US In-Reply-To: <7869219493bb4cc5626da704c4f8f107fe7c8f69.1752013061.git.babu.moger@amd.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: MW4PR03CA0356.namprd03.prod.outlook.com (2603:10b6:303:dc::31) 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_|SJ0PR11MB5135:EE_ X-MS-Office365-Filtering-Correlation-Id: 18e6510e-2552-4194-9db5-08ddc5afff67 X-LD-Processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|7416014|376014|7053199007; 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In mbm_event mode, monitoring event can only accumulate data > while it is backed by a hardware counter. In "default" mode, resctrl > assumes there is a hardware counter for each event within every CTRL_MON > and MON group. > > Introduce mbm_assign_mode resctrl file to switch between mbm_event and > default modes. > > Example: > To list the MBM monitor modes supported: > $ cat /sys/fs/resctrl/info/L3_MON/mbm_assign_mode > [mbm_event] > default > > To enable the "mbm_event" monitoring mode: "monitoring mode" -> "counter assignment mode"? > $ echo "mbm_event" > /sys/fs/resctrl/info/L3_MON/mbm_assign_mode > > To enable the "default" monitoring mode: > $ echo "default" > /sys/fs/resctrl/info/L3_MON/mbm_assign_mode > > MBM event counters are automatically reset as part of changing the mode. > Clear both architectural and non-architectural event states to prevent > overflow conditions during the next event read. Also clear assignable > counter configuration on all the domains. > > Signed-off-by: Babu Moger > --- ... > --- > Documentation/filesystems/resctrl.rst | 22 +++++++- > fs/resctrl/internal.h | 2 + > fs/resctrl/monitor.c | 27 ++++++++++ > fs/resctrl/rdtgroup.c | 72 ++++++++++++++++++++++++++- > 4 files changed, 121 insertions(+), 2 deletions(-) > > diff --git a/Documentation/filesystems/resctrl.rst b/Documentation/filesystems/resctrl.rst > index 2b2acb55d8b1..b8a4dbe061ea 100644 > --- a/Documentation/filesystems/resctrl.rst > +++ b/Documentation/filesystems/resctrl.rst > @@ -259,7 +259,8 @@ with the following files: > > "mbm_assign_mode": > The supported counter assignment modes. The enclosed brackets indicate which mode > - is enabled. > + is enabled. The MBM events associated with counters may reset when "mbm_assign_mode" > + is changed. > :: > > # cat /sys/fs/resctrl/info/L3_MON/mbm_assign_mode > @@ -279,6 +280,15 @@ with the following files: > of counters available is described in the "num_mbm_cntrs" file. Changing the > mode may cause all counters on the resource to reset. > > + Moving to mbm_event counter assignment mode requires users to assign the counters > + to the events. Otherwise, the MBM event counters will return 'Unassigned' when read. > + > + The mode is beneficial for AMD platforms that support more CTRL_MON > + and MON groups than available hardware counters. By default, this > + feature is enabled on AMD platforms with the ABMC (Assignable Bandwidth > + Monitoring Counters) capability, ensuring counters remain assigned even > + when the corresponding RMID is not actively used by any processor. > + > "default": > > In default mode, resctrl assumes there is a hardware counter for each > @@ -288,6 +298,16 @@ with the following files: > result in misleading values or display "Unavailable" if no counter is assigned > to the event. > > + * To enable "mbm_event" monitoring mode: "monitoring mode" -> "counter assignment mode"? > + :: > + > + # echo "mbm_event" > /sys/fs/resctrl/info/L3_MON/mbm_assign_mode > + > + * To enable "default" monitoring mode: > + :: > + > + # echo "default" > /sys/fs/resctrl/info/L3_MON/mbm_assign_mode > + > "num_mbm_cntrs": > The maximum number of counters (total of available and assigned counters) in > each domain when the system supports mbm_event mode. Reinette