From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx102.postini.com [74.125.245.102]) by kanga.kvack.org (Postfix) with SMTP id A73036B0074 for ; Mon, 13 May 2013 15:10:23 -0400 (EDT) Message-ID: <51913A9B.2030807@redhat.com> Date: Mon, 13 May 2013 15:10:19 -0400 From: Rik van Riel MIME-Version: 1.0 Subject: Re: [RFC 2/2] virtio_balloon: auto-ballooning support References: <1368111229-29847-1-git-send-email-lcapitulino@redhat.com> <1368111229-29847-3-git-send-email-lcapitulino@redhat.com> <20130512143054.GI10144@redhat.com> <518FC4F9.5010505@redhat.com> <20130512184934.GA16334@redhat.com> <20130513110303.33dbaba6@redhat.com> <20130513151624.GB1992@redhat.com> <51910552.5050507@redhat.com> <20130513153513.GA4981@redhat.com> In-Reply-To: <20130513153513.GA4981@redhat.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: "Michael S. Tsirkin" Cc: Luiz Capitulino , linux-mm@kvack.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, aquini@redhat.com, amit.shah@redhat.com, anton@enomsg.org On 05/13/2013 11:35 AM, Michael S. Tsirkin wrote: > On Mon, May 13, 2013 at 11:22:58AM -0400, Rik van Riel wrote: >> I believe the Google patches still included some way for the >> host to initiate balloon inflation on the guest side, because >> the guest internal state alone is not enough to see when the >> host is under memory pressure. >> >> I discussed the project with the Google developers in question >> a little over a year ago, but I do not remember whether their >> pressure notification went through qemu, or directly from the >> host kernel to the guest kernel... > > So increasing the max number of pages in balloon > indicates host memory pressure to the guest? > Fair enough but I wonder whether there's a way to > make it more explicit in the interface, somehow. There may be a better way to do this, but I am really not sure what that would be. What properties would you like to see in the interface? What kind of behaviour are you looking for? -- All rights reversed -- 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