Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759565AbcCDQYn (ORCPT ); Fri, 4 Mar 2016 11:24:43 -0500 Received: from mx1.redhat.com ([209.132.183.28]:33576 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751415AbcCDQYm (ORCPT ); Fri, 4 Mar 2016 11:24:42 -0500 Subject: Re: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration optimization To: "Li, Liang Z" , Roman Kagan References: <1457001868-15949-1-git-send-email-liang.z.li@intel.com> <20160303174615.GF2115@work-vm> <20160304081411.GD9100@rkaganb.sw.ru> <20160304102346.GB2479@rkaganb.sw.ru> Cc: "Dr. David Alan Gilbert" , "ehabkost@redhat.com" , "kvm@vger.kernel.org" , "mst@redhat.com" , "quintela@redhat.com" , "linux-kernel@vger.kernel.org" , "qemu-devel@nongnu.org" , "linux-mm@kvack.org" , "amit.shah@redhat.com" , "akpm@linux-foundation.org" , "virtualization@lists.linux-foundation.org" , "rth@twiddle.net" From: Paolo Bonzini Message-ID: <56D9B6C2.3070708@redhat.com> Date: Fri, 4 Mar 2016 17:24:34 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Fri, 04 Mar 2016 16:24:41 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 640 Lines: 20 On 04/03/2016 15:26, Li, Liang Z wrote: >> > >> > The memory usage will keep increasing due to ever growing caches, etc, so >> > you'll be left with very little free memory fairly soon. >> > > I don't think so. > Roman is right. For example, here I am looking at a 64 GB (physical) machine which was booted about 30 minutes ago, and which is running disk-heavy workloads (installing VMs). Since I have started writing this email (2 minutes?), the amount of free memory has already gone down from 37 GB to 33 GB. I expect that by the time I have finished running the workload, in two hours, it will not have any free memory. Paolo