From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754084AbeEOQ0W (ORCPT ); Tue, 15 May 2018 12:26:22 -0400 Received: from mga05.intel.com ([192.55.52.43]:24245 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753125AbeEOQ0V (ORCPT ); Tue, 15 May 2018 12:26:21 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.49,403,1520924400"; d="scan'208";a="199573855" Message-ID: <1526401576.5391.2.camel@linux.intel.com> Subject: Re: [PATCH 0/15] x86/split_lock: Enable #AC exception for split locked accesses From: Alan Cox To: Dave Hansen , Fenghua Yu , Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , Ashok Raj , Ravi V Shankar , Tony Luck , Rafael Wysocki , Arjan van de Ven Cc: x86 , linux-kernel Date: Tue, 15 May 2018 17:26:16 +0100 In-Reply-To: References: <1526323945-211107-1-git-send-email-fenghua.yu@intel.com> Organization: Intel Corporation Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.24.6 (3.24.6-1.fc26) Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > Could you describe the performance degradation? Why is this not a > "doctor it hurts when I do that" situation? They already know it hurts - the question is why and where. Alan