From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 25A90E8FDBB for ; Tue, 3 Oct 2023 21:30:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232288AbjJCVa4 (ORCPT ); Tue, 3 Oct 2023 17:30:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54020 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230251AbjJCVaz (ORCPT ); Tue, 3 Oct 2023 17:30:55 -0400 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.9]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7A09E83; Tue, 3 Oct 2023 14:30:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1696368651; x=1727904651; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=wiY0eeufMNNk9jH1XIadte3o5RqKY1pTvxQYoyPVqyk=; b=A9FC3s2fKzgUgwgplzVW5p2uaVCqBtf7vnnwrQBdRzwYTEzdcTYPcrlO P8s0NIVQymbykh5hve9z68tt6U3V6x8NO6bgJYz6CsHSv1ckIvJ043dSe Dek9+D59WOsPiaM2wmeRloTwJIYAFjmz4GAbX1N8L27oFmu+BqignHZkb buXFbI296Sqknsc/VqjGJd9d9jfZD2iegyYRhR6KszU6JEG2avCZq5BrL Xxv0cwTFU6fn8XRx7eu+fRyisapCL/AIkF5S45lboKzQhLZ8vAIcDT+Yo KbYuO58guAj70DER5ulNduouS02dwnprLkyIog+eKO17m29z18gqmkxfy g==; X-IronPort-AV: E=McAfee;i="6600,9927,10852"; a="1580363" X-IronPort-AV: E=Sophos;i="6.03,198,1694761200"; d="scan'208";a="1580363" Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orvoesa101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Oct 2023 14:30:51 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10852"; a="924801966" X-IronPort-AV: E=Sophos;i="6.03,198,1694761200"; d="scan'208";a="924801966" Received: from agluck-desk3.sc.intel.com ([172.25.222.74]) by orsmga005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Oct 2023 14:30:50 -0700 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 v8 0/8] Add support for Sub-NUMA cluster (SNC) systems Date: Tue, 3 Oct 2023 14:30:35 -0700 Message-ID: <20231003213043.13565-1-tony.luck@intel.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230928191350.205703-1-tony.luck@intel.com> References: <20230928191350.205703-1-tony.luck@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org The Sub-NUMA cluster feature on some Intel processors partitions the CPUs that share an L3 cache into two or more sets. This plays havoc with the Resource Director Technology (RDT) monitoring features. Prior to this patch Intel has advised that SNC and RDT are incompatible. Some of these CPU support an MSR that can partition the RMID counters in the same way. This allows for monitoring features to be used (with the caveat that memory accesses between different SNC NUMA nodes may still not be counted accurately. Note that this patch series improves resctrl reporting considerably on systems with SNC enabled, but there will still be some anomalies for processes accessing memory from other sub-NUMA nodes. Signed-off-by: Tony Luck --- Please ignore v7 posting. There was some glitch in how I created the patches with "git format-patch" that meant part 0004 would not apply. Changes since v6: * Fixed spelling of "accurately" in cover letter. * Applied changes from Peter Newman's review Link: https://lore.kernel.org/r/CALPaoChB5ryT96ZZBQb6+3=xO+A0uR-ToN0TWqUjLJ7bgi==Rg@mail.gmail.com (and follow-on posts against other patches in the v6 series). See comments in indivdual patches for specific details. Added Peter's "Reviewed-by" to parts 4-7.q Tony Luck (8): x86/resctrl: Prepare for new domain scope x86/resctrl: Prepare to split rdt_domain structure x86/resctrl: Prepare for different scope for control/monitor operations x86/resctrl: Split the rdt_domain and rdt_hw_domain structures x86/resctrl: Add node-scope to the options for feature scope x86/resctrl: Introduce snc_nodes_per_l3_cache x86/resctrl: Sub NUMA Cluster detection and enable x86/resctrl: Update documentation with Sub-NUMA cluster changes Documentation/arch/x86/resctrl.rst | 23 +- include/linux/resctrl.h | 85 +++-- arch/x86/include/asm/msr-index.h | 1 + arch/x86/kernel/cpu/resctrl/internal.h | 66 ++-- arch/x86/kernel/cpu/resctrl/core.c | 400 +++++++++++++++++----- arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 58 ++-- arch/x86/kernel/cpu/resctrl/monitor.c | 58 ++-- arch/x86/kernel/cpu/resctrl/pseudo_lock.c | 14 +- arch/x86/kernel/cpu/resctrl/rdtgroup.c | 132 +++---- 9 files changed, 591 insertions(+), 246 deletions(-) base-commit: 6465e260f48790807eef06b583b38ca9789b6072 -- 2.41.0