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 X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E131DC64E7C for ; Wed, 2 Dec 2020 20:37:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 84A3F22203 for ; Wed, 2 Dec 2020 20:37:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727922AbgLBUg4 convert rfc822-to-8bit (ORCPT ); Wed, 2 Dec 2020 15:36:56 -0500 Received: from mga04.intel.com ([192.55.52.120]:1712 "EHLO mga04.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726885AbgLBUg4 (ORCPT ); Wed, 2 Dec 2020 15:36:56 -0500 IronPort-SDR: Lmd6mXmjS40ZS/OXtCXxGdOEzzIBFPe5ZRDkmkEk5e2zvQYCWmW/V9EHs2y1oJeONOQN/As7t0 dbiLSYCb9z/g== X-IronPort-AV: E=McAfee;i="6000,8403,9823"; a="170517888" X-IronPort-AV: E=Sophos;i="5.78,387,1599548400"; d="scan'208";a="170517888" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga007.jf.intel.com ([10.7.209.58]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Dec 2020 12:36:13 -0800 IronPort-SDR: KVsXxdEIGH0WO4Y8DHnZZYFabT9nbW/WWcaHwhjqob/VY78THRaYMoNv4+w+tK2uc6xHgwfILX 9DcJ9CapMQ2g== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.78,387,1599548400"; d="scan'208";a="373296501" Received: from orsmsx602.amr.corp.intel.com ([10.22.229.15]) by orsmga007.jf.intel.com with ESMTP; 02 Dec 2020 12:36:12 -0800 Received: from orsmsx610.amr.corp.intel.com (10.22.229.23) by ORSMSX602.amr.corp.intel.com (10.22.229.15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5; Wed, 2 Dec 2020 12:36:12 -0800 Received: from orsmsx611.amr.corp.intel.com (10.22.229.24) by ORSMSX610.amr.corp.intel.com (10.22.229.23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.1713.5; Wed, 2 Dec 2020 12:36:11 -0800 Received: from orsmsx611.amr.corp.intel.com ([10.22.229.24]) by ORSMSX611.amr.corp.intel.com ([10.22.229.24]) with mapi id 15.01.1713.004; Wed, 2 Dec 2020 12:36:12 -0800 From: "Yu, Fenghua" To: Thomas Gleixner , Borislav Petkov , Ingo Molnar , Peter Zijlstra , "Luck, Tony" , Randy Dunlap , "Li, Xiaoyao" , "Shankar, Ravi V" CC: linux-kernel , x86 Subject: RE: [PATCH v4 0/4] x86/bus_lock: Enable bus lock detection Thread-Topic: [PATCH v4 0/4] x86/bus_lock: Enable bus lock detection Thread-Index: AQHWwqPI8KLTpoG8aUep9FiVmYQyOankT8Zg Date: Wed, 2 Dec 2020 20:36:11 +0000 Message-ID: <34d86c3a1cd044f28f70202292e1d13a@intel.com> References: <20201124205245.4164633-1-fenghua.yu@intel.com> In-Reply-To: <20201124205245.4164633-1-fenghua.yu@intel.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: dlp-product: dlpe-windows dlp-reaction: no-action dlp-version: 11.5.1.3 x-originating-ip: [10.1.200.100] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, Dear maintainers, > A bus lock [1] is acquired through either split locked access to writeback (WB) > memory or any locked access to non-WB memory. This is typically >1000 > cycles slower than an atomic operation within a cache line. It also disrupts > performance on other cores. ... > Change Log: > v4: > - Fix a ratelimit wording issue in the doc (Randy). > - Patch 4 is acked by Randy (Randy). Friendly reminder about this series... Thank you very much in advance for your time! -Fenghua