From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752619AbeBAQEN (ORCPT ); Thu, 1 Feb 2018 11:04:13 -0500 Received: from mx1.redhat.com ([209.132.183.28]:57082 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751966AbeBAQEI (ORCPT ); Thu, 1 Feb 2018 11:04:08 -0500 Date: Thu, 1 Feb 2018 18:03:52 +0200 From: "Michael S. Tsirkin" To: Wei Wang Cc: "virtio-dev@lists.oasis-open.org" , "linux-kernel@vger.kernel.org" , "virtualization@lists.linux-foundation.org" , "kvm@vger.kernel.org" , "linux-mm@kvack.org" , "mhocko@kernel.org" , "akpm@linux-foundation.org" , "pbonzini@redhat.com" , "liliang.opensource@gmail.com" , "yang.zhang.wz@gmail.com" , "quan.xu0@gmail.com" , "nilal@redhat.com" , "riel@redhat.com" Subject: Re: [virtio-dev] Re: [PATCH v25 2/2] virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT Message-ID: <20180201175115-mutt-send-email-mst@kernel.org> References: <1516871646-22741-1-git-send-email-wei.w.wang@intel.com> <1516871646-22741-3-git-send-email-wei.w.wang@intel.com> <20180125154708-mutt-send-email-mst@kernel.org> <5A6A871C.6040408@intel.com> <20180126042649-mutt-send-email-mst@kernel.org> <5A6AA107.3000607@intel.com> <20180131011423-mutt-send-email-mst@kernel.org> <5A72E13A.9030701@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <5A72E13A.9030701@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Feb 01, 2018 at 05:43:22PM +0800, Wei Wang wrote: > 3) Hints means the pages are quite likely to be free pages (no guarantee). > If the pages given to host are going to be freed, then we really couldn't > call them hints, they are true free pages. Ballooning needs true free pages, > while live migration needs hints, would you agree with this? It's an interesting point, I'm convinced by it. -- MST