From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f200.google.com (mail-pf0-f200.google.com [209.85.192.200]) by kanga.kvack.org (Postfix) with ESMTP id 8A7446B0033 for ; Mon, 30 Jan 2017 20:57:10 -0500 (EST) Received: by mail-pf0-f200.google.com with SMTP id c73so481928611pfb.7 for ; Mon, 30 Jan 2017 17:57:10 -0800 (PST) Received: from mga02.intel.com (mga02.intel.com. [134.134.136.20]) by mx.google.com with ESMTPS id u22si14370348pfd.46.2017.01.30.17.57.09 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 30 Jan 2017 17:57:09 -0800 (PST) Subject: Re: [RFC V2 03/12] mm: Change generic FALLBACK zonelist creation process References: <20170130033602.12275-1-khandual@linux.vnet.ibm.com> <20170130033602.12275-4-khandual@linux.vnet.ibm.com> <07bd439c-6270-b219-227b-4079d36a2788@intel.com> <434aa74c-e917-490e-85ab-8c67b1a82d95@linux.vnet.ibm.com> From: Dave Hansen Message-ID: Date: Mon, 30 Jan 2017 17:57:08 -0800 MIME-Version: 1.0 In-Reply-To: <434aa74c-e917-490e-85ab-8c67b1a82d95@linux.vnet.ibm.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Anshuman Khandual , linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: mhocko@suse.com, vbabka@suse.cz, mgorman@suse.de, minchan@kernel.org, aneesh.kumar@linux.vnet.ibm.com, bsingharora@gmail.com, srikar@linux.vnet.ibm.com, haren@linux.vnet.ibm.com, jglisse@redhat.com, dan.j.williams@intel.com On 01/30/2017 05:36 PM, Anshuman Khandual wrote: >> Let's say we had a CDM node with 100x more RAM than the rest of the >> system and it was just as fast as the rest of the RAM. Would we still >> want it isolated like this? Or would we want a different policy? > > But then the other argument being, dont we want to keep this 100X more > memory isolated for some special purpose to be utilized by specific > applications ? I was thinking that in this case, we wouldn't even want to bother with having "system RAM" in the fallback lists. A device who got its memory usage off by 1% could start to starve the rest of the system. A sane policy in this case might be to isolate the "system RAM" from the device's. >> Why do we need this hard-coded along with the cpuset stuff later in the >> series. Doesn't taking a node out of the cpuset also take it out of the >> fallback lists? > > There are two mutually exclusive approaches which are described in > this patch series. > > (1) zonelist modification based approach > (2) cpuset restriction based approach > > As mentioned in the cover letter, Well, I'm glad you coded both of them up, but now that we have them how to we pick which one to throw to the wolves? Or, do we just merge both of them and let one bitrot? ;) -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org