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b=JwAftXKccvhqXINyXGDWTUoupv+/4iIV5wZOTXogzpBeD3JtkzW9Vd9Uu4u10/N+oXTH0E3+g4N8LauNXm4os7b2j3fq3xvDw5vELy1swGPlCtWu9qEFFUl9qCpHPYNandwkA8mk1RbwPLG2XOt0BeImE2t0kfSq6SXl+l0Jmf8= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=amd.com; Received: from MW3PR12MB4553.namprd12.prod.outlook.com (2603:10b6:303:2c::19) by MW3PR12MB4492.namprd12.prod.outlook.com (2603:10b6:303:57::10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8422.11; Thu, 6 Feb 2025 23:42:05 +0000 Received: from MW3PR12MB4553.namprd12.prod.outlook.com ([fe80::b0ef:2936:fec1:3a87]) by MW3PR12MB4553.namprd12.prod.outlook.com ([fe80::b0ef:2936:fec1:3a87%4]) with mapi id 15.20.8422.010; Thu, 6 Feb 2025 23:42:05 +0000 Message-ID: <7b1765c8-9944-44db-9a0b-fddd102f156b@amd.com> Date: Thu, 6 Feb 2025 17:41:59 -0600 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v11 07/23] x86/resctrl: Introduce the interface to display monitor mode To: Reinette Chatre , Babu Moger , corbet@lwn.net, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, tony.luck@intel.com, peternewman@google.com Cc: x86@kernel.org, hpa@zytor.com, paulmck@kernel.org, akpm@linux-foundation.org, thuth@redhat.com, rostedt@goodmis.org, xiongwei.song@windriver.com, pawan.kumar.gupta@linux.intel.com, daniel.sneddon@linux.intel.com, jpoimboe@kernel.org, perry.yuan@amd.com, sandipan.das@amd.com, kai.huang@intel.com, xiaoyao.li@intel.com, seanjc@google.com, xin3.li@intel.com, andrew.cooper3@citrix.com, ebiggers@google.com, mario.limonciello@amd.com, james.morse@arm.com, tan.shaopeng@fujitsu.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, maciej.wieczor-retman@intel.com, eranian@google.com References: <6d215925-ee84-4b39-b002-9e3b66c015b0@intel.com> Content-Language: en-US From: "Moger, Babu" In-Reply-To: <6d215925-ee84-4b39-b002-9e3b66c015b0@intel.com> Content-Type: text/plain; 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Sure. > >> Bandwidth Monitoring Counters) hardware feature and is enabled by default. >> >> The "default" mode is the existing monitoring mode that works without the >> explicit counter assignment, instead relying on dynamic counter assignment >> by hardware that may result in hardware not dedicating a counter resulting >> in monitoring data reads returning "Unavailable". >> >> Provide an interface to display the monitor mode on the system. >> $ cat /sys/fs/resctrl/info/L3_MON/mbm_assign_mode >> [mbm_cntr_assign] >> default >> >> Signed-off-by: Babu Moger >> --- > > >> --- >> Documentation/arch/x86/resctrl.rst | 26 +++++++++++++++++++++ >> arch/x86/kernel/cpu/resctrl/rdtgroup.c | 31 ++++++++++++++++++++++++++ >> 2 files changed, 57 insertions(+) >> >> diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst >> index fb90f08e564e..b5defc5bce0e 100644 >> --- a/Documentation/arch/x86/resctrl.rst >> +++ b/Documentation/arch/x86/resctrl.rst >> @@ -257,6 +257,32 @@ with the following files: >> # cat /sys/fs/resctrl/info/L3_MON/mbm_local_bytes_config >> 0=0x30;1=0x30;3=0x15;4=0x15 >> >> +"mbm_assign_mode": >> + Reports the list of monitoring modes supported. The enclosed brackets >> + indicate which mode is enabled. >> + :: >> + >> + # cat /sys/fs/resctrl/info/L3_MON/mbm_assign_mode >> + [mbm_cntr_assign] >> + default >> + >> + "mbm_cntr_assign": >> + >> + In mbm_cntr_assign, monitoring event can only accumulate data while > > "In mbm_cntr_assign, monitoring event" -> "In mbm_cntr_assign mode, a monitoring event"? Sure. > >> + it is backed by a hardware counter. The user-space is able to specify >> + which of the events in CTRL_MON or MON groups should have a counter >> + assigned using the "mbm_assign_control" file. The number of counters >> + available is described in the "num_mbm_cntrs" file. Changing the mode >> + may cause all counters on a resource to reset. >> + >> + "default": >> + >> + In default mode, resctrl assumes there is a hardware counter for each >> + event within every CTRL_MON and MON group. On AMD platforms, it is >> + recommended to use mbm_cntr_assign mode if supported, because reading >> + "mbm_total_bytes" or "mbm_local_bytes" will report 'Unavailable' if > > Reinette > Thanks Babu