From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:59989) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UI0iw-0008Vp-Pm for qemu-devel@nongnu.org; Tue, 19 Mar 2013 13:53:24 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UI0io-0002CC-3Z for qemu-devel@nongnu.org; Tue, 19 Mar 2013 13:53:22 -0400 Received: from mx1.redhat.com ([209.132.183.28]:61980) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UI0in-0002Bx-RA for qemu-devel@nongnu.org; Tue, 19 Mar 2013 13:53:14 -0400 Message-ID: <5148A5FB.1000209@redhat.com> Date: Tue, 19 Mar 2013 18:52:59 +0100 From: Paolo Bonzini MIME-Version: 1.0 References: <1363576743-6146-1-git-send-email-mrhines@linux.vnet.ibm.com> <1363576743-6146-4-git-send-email-mrhines@linux.vnet.ibm.com> <20130318104013.GE5267@redhat.com> <5147780C.1080800@linux.vnet.ibm.com> <20130318212646.GB20406@redhat.com> <5147A209.80202@linux.vnet.ibm.com> <20130319081939.GC11259@redhat.com> <51487F68.2060305@linux.vnet.ibm.com> <20130319151606.GA13649@redhat.com> <51488521.4010909@linux.vnet.ibm.com> <20130319153658.GA14317@redhat.com> <51489BC3.3030504@linux.vnet.ibm.com> <51489D05.2000400@redhat.com> <5148A2F6.1070206@linux.vnet.ibm.com> In-Reply-To: <5148A2F6.1070206@linux.vnet.ibm.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [RFC PATCH RDMA support v4: 03/10] more verbose documentation of the RDMA transport List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: "Michael R. Hines" Cc: aliguori@us.ibm.com, "Michael S. Tsirkin" , qemu-devel@nongnu.org, owasserm@redhat.com, abali@us.ibm.com, mrhines@us.ibm.com, gokul@us.ibm.com Il 19/03/2013 18:40, Michael R. Hines ha scritto: > registration scheme would not work with cgroups because we would be > attempting to pin zero pages (for no reason) that cgroups has already > kicked out, which would defeat the purpose of using cgroups. Yeah, pinning would be a problem. > So, if I submit a separate patch to fix this, would you guys review it? > (Using /dev/pagemap). Sorry about the ignorance, but what is /dev/pagemap? :) > Unless there is a better idea? Does KVM expose the necessary mappings? We could have the balloon driver track the pages. I and Michael had some initial work a few months ago on extending the virtio-balloon spec to allow this. It went nowhere, though. Still, at this point this is again an RDMA-specific problem, I don't think it would be that bad if the first iterations of RDMA didn't support ballooning/overcommit. Paolo