From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758497AbcLUVcd (ORCPT ); Wed, 21 Dec 2016 16:32:33 -0500 Received: from mga07.intel.com ([134.134.136.100]:11874 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754531AbcLUVcc (ORCPT ); Wed, 21 Dec 2016 16:32:32 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.33,385,1477983600"; d="scan'208";a="914939508" Date: Wed, 21 Dec 2016 13:31:37 -0800 From: Fenghua Yu To: Linus Torvalds , Thomas Gleixner Cc: Tony Luck , Peter Zijlstra , "H. Peter Anvin" , Ingo Molnar , linux-kernel Subject: Re: [GIT pull] x86/cache: Updates for 4.10 Message-ID: <20161221213136.GB56305@linux.intel.com> References: <20161221210119.GA56305@linux.intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20161221210119.GA56305@linux.intel.com> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Dec 13, 2016, Thomas Gleixner wrote: > On Mon, 12 Dec 2016, Linus Torvalds wrote: > On Mon, Dec 12, 2016 at 1:53 AM, Thomas Gleixner wrote: >> It looks pretty self-contained (good), but it also looks majorly >> strange. I will have to think about this. What are the main/expected >> users? > - Virtualization so a VM can only trash only the associated part of the > cash w/o disturbing others > > - Real-Time systems to seperate RT and general workloads. > > - Latency sensitive enterprise workloads > > - In theory this also can be used to protect against cache side channel > attacks. Quite a few companies and research groups are interested in the hardware feature and/or the resctrl file system interface. They do demonstrate performance and QoS improvements in real-time, VM, and native Linux by partitioning cache for processes to avoid noisy neighbors. Thanks. -Fenghua