From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="KJRUJPTP" Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.7]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 68ECF170F; Thu, 7 Dec 2023 11:56:26 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1701978986; x=1733514986; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=7Y+W1l2QvxVLq3YI3AbXljtPrGo+7Qw1R28SArBOmbk=; b=KJRUJPTPm4Vl80uWPmSXEmxulAoj3j/TGEKecYavYOpMoYirsraIZ2rG i2wkKa0uPioAOcYtwEHZNqVZdXV3bpYmK1tF707UOSptVJTGoWnsZzIbe V3THq/Kfp/i779XtWiPBiIT4VWLNzqUs/hTFciGp/CiNyYZIE+7a4GZBH k/zWafEgTbjrr7SPAr71Mct+I2MDmAIk4tlNdk/FUL02wpK124g0Nbzmu kUetYjmi0KIVJ6oCeQ6OvMrx8ao1v0EEu5x9WeZbFwixKBk4x/RGimNzW OAtwVjmKIQQWtU5KypD857yQYFFQ7eXHh5fGo3hjbiKUJtc74RO9np6ER w==; X-IronPort-AV: E=McAfee;i="6600,9927,10917"; a="15848980" X-IronPort-AV: E=Sophos;i="6.04,258,1695711600"; d="scan'208";a="15848980" Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmvoesa101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Dec 2023 11:56:24 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10917"; a="889858596" X-IronPort-AV: E=Sophos;i="6.04,258,1695711600"; d="scan'208";a="889858596" Received: from agluck-desk3.sc.intel.com ([172.25.222.74]) by fmsmga002-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Dec 2023 11:56:24 -0800 From: Tony Luck To: Fenghua Yu , Reinette Chatre , Peter Newman , Jonathan Corbet , Shuah Khan , x86@kernel.org Cc: Shaopeng Tan , James Morse , Jamie Iles , Babu Moger , Randy Dunlap , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, patches@lists.linux.dev, Tony Luck Subject: [PATCH v6 3/3] x86/resctrl: Add new "mba_MBps_event" mount option to documentation Date: Thu, 7 Dec 2023 11:56:13 -0800 Message-ID: <20231207195613.153980-4-tony.luck@intel.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231207195613.153980-1-tony.luck@intel.com> References: <20231201214737.104444-1-tony.luck@intel.com> <20231207195613.153980-1-tony.luck@intel.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit New mount option may be used to choose a specific memory bandwidth monitoring event to feed the MBA Software Controller(mba_sc) feedback loop. Signed-off-by: Tony Luck --- Documentation/arch/x86/resctrl.rst | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst index a6279df64a9d..a0c521db6786 100644 --- a/Documentation/arch/x86/resctrl.rst +++ b/Documentation/arch/x86/resctrl.rst @@ -35,7 +35,8 @@ about the feature from resctrl's info directory. To use the feature mount the file system:: - # mount -t resctrl resctrl [-o cdp[,cdpl2][,mba_MBps][,debug]] /sys/fs/resctrl + # mount -t resctrl resctrl [-o cdp[,cdpl2][,mba_MBps] \ + [,mba_MBps_event=[mbm_local_bytes|mbm_total_bytes]][,debug]] /sys/fs/resctrl mount options are: @@ -45,7 +46,12 @@ mount options are: Enable code/data prioritization in L2 cache allocations. "mba_MBps": Enable the MBA Software Controller(mba_sc) to specify MBA - bandwidth in MBps + bandwidth in MBps. Defaults to using MBM local bandwidth, + but will use total bandwidth on systems that do not support + local bandwidth monitoring. +"mba_MBps_event=[mbm_local_bytes|mbm_total_bytes]": + Enable the MBA Software Controller(mba_sc) with a specific + MBM event as input to the feedback loop. "debug": Make debug files accessible. Available debug files are annotated with "Available only with debug option". @@ -538,6 +544,12 @@ where as user can switch to the "MBA software controller" mode using a mount option 'mba_MBps'. The schemata format is specified in the below sections. +By default the software feedback mechanism uses measurement of local +memory bandwidth to make adjustments to throttling levels. If a system +is running applications with poor NUMA locality users may want to use +the "mba_MBps_event=mbm_total_bytes" mount option which will use total +memory bandwidth measurements instead of local. + L3 schemata file details (code and data prioritization disabled) ---------------------------------------------------------------- With CDP disabled the L3 schemata format is:: -- 2.41.0