From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753624AbdHXQIj (ORCPT ); Thu, 24 Aug 2017 12:08:39 -0400 Received: from mga06.intel.com ([134.134.136.31]:26882 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752370AbdHXQIh (ORCPT ); Thu, 24 Aug 2017 12:08:37 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.41,422,1498546800"; d="scan'208";a="127857610" Subject: Re: [RESEND PATCH 0/3] mm: Add cache coloring mechanism To: Vlastimil Babka , =?UTF-8?Q?=c5=81ukasz_Daniluk?= , linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20170823100205.17311-1-lukasz.daniluk@intel.com> Cc: lukasz.anaczkowski@intel.com From: Dave Hansen Message-ID: <82cc1886-6c24-4e6e-7269-4d150e9f39eb@intel.com> Date: Thu, 24 Aug 2017 09:08:32 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.2.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 08/24/2017 05:47 AM, Vlastimil Babka wrote: > So the obvious question, what about THPs? Their size should be enough to > contain all the colors with current caches, no? Even on KNL I didn't > find more than "32x 1 MB 16-way L2 caches". This is in addition to the > improved TLB performance, which you want to get as well for such workloads? The cache in this case is "MCDRAM" which is 16GB in size. It can be used as normal RAM or a cache. This patch deals with when "MCDRAM" is in its cache mode. It's described in the "Memory Modes" slide here: > http://www.nersc.gov/users/computational-systems/cori/configuration/knl-processor-modes/