From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A4158C43387 for ; Thu, 27 Dec 2018 11:31:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 65E1A208E4 for ; Thu, 27 Dec 2018 11:31:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729704AbeL0LbX convert rfc822-to-8bit (ORCPT ); Thu, 27 Dec 2018 06:31:23 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:56068 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727858AbeL0LbW (ORCPT ); Thu, 27 Dec 2018 06:31:22 -0500 Received: from pps.filterd (m0098399.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id wBRBSwR0082773 for ; Thu, 27 Dec 2018 06:31:21 -0500 Received: from e06smtp02.uk.ibm.com (e06smtp02.uk.ibm.com [195.75.94.98]) by mx0a-001b2d01.pphosted.com with ESMTP id 2pms5tth01-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Thu, 27 Dec 2018 06:31:21 -0500 Received: from localhost by e06smtp02.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Thu, 27 Dec 2018 11:31:14 -0000 Received: from d06av24.portsmouth.uk.ibm.com (mk.ibm.com [9.149.105.60]) by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id wBRBVDlD66912330 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 27 Dec 2018 11:31:13 GMT Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8BF6B42041; Thu, 27 Dec 2018 11:31:13 +0000 (GMT) Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D9F7342042; Thu, 27 Dec 2018 11:31:11 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.152.224.141]) by d06av24.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 27 Dec 2018 11:31:11 +0000 (GMT) Subject: Re: [PATCH v37 0/3] Virtio-balloon: support free page reporting To: Wei Wang , virtio-dev@lists.oasis-open.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, kvm@vger.kernel.org, linux-mm@kvack.org, mst@redhat.com, mhocko@kernel.org, akpm@linux-foundation.org, dgilbert@redhat.com Cc: torvalds@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, peterx@redhat.com, quintela@redhat.com References: <1535333539-32420-1-git-send-email-wei.w.wang@intel.com> From: Christian Borntraeger Openpgp: preference=signencrypt Autocrypt: addr=borntraeger@de.ibm.com; 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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 In-Reply-To: <1535333539-32420-1-git-send-email-wei.w.wang@intel.com> Content-Language: en-US X-TM-AS-GCONF: 00 x-cbid: 18122711-0008-0000-0000-000002A6EB64 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18122711-0009-0000-0000-00002212F176 Message-Id: <0661b05a-d9d0-d374-44e8-2583463e94c2@de.ibm.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-12-27_08:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=801 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1812270105 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch triggers random crashes in the guest kernel on s390 early during boot. No migration and no setting of the balloon is involved. On 27.08.2018 03:32, Wei Wang wrote: > The new feature, VIRTIO_BALLOON_F_FREE_PAGE_HINT, implemented by this > series enables the virtio-balloon driver to report hints of guest free > pages to host. It can be used to accelerate virtual machine (VM) live > migration. Here is an introduction of this usage: > > Live migration needs to transfer the VM's memory from the source machine > to the destination round by round. For the 1st round, all the VM's memory > is transferred. From the 2nd round, only the pieces of memory that were > written by the guest (after the 1st round) are transferred. One method > that is popularly used by the hypervisor to track which part of memory is > written is to have the hypervisor write-protect all the guest memory. > > This feature enables the optimization by skipping the transfer of guest > free pages during VM live migration. It is not concerned that the memory > pages are used after they are given to the hypervisor as a hint of the > free pages, because they will be tracked by the hypervisor and transferred > in the subsequent round if they are used and written. > > * Tests > 1 Test Environment > Host: Intel(R) Xeon(R) CPU E5-2699 v4 @ 2.20GHz > Migration setup: migrate_set_speed 100G, migrate_set_downtime 400ms > > 2 Test Results (results are averaged over several repeated runs) > 2.1 Guest setup: 8G RAM, 4 vCPU > 2.1.1 Idle guest live migration time > Optimization v.s. Legacy = 620ms vs 2970ms > --> ~79% reduction > 2.1.2 Guest live migration with Linux compilation workload > (i.e. make bzImage -j4) running > 1) Live Migration Time: > Optimization v.s. Legacy = 2273ms v.s. 4502ms > --> ~50% reduction > 2) Linux Compilation Time: > Optimization v.s. Legacy = 8min42s v.s. 8min43s > --> no obvious difference > > 2.2 Guest setup: 128G RAM, 4 vCPU > 2.2.1 Idle guest live migration time > Optimization v.s. Legacy = 5294ms vs 41651ms > --> ~87% reduction > 2.2.2 Guest live migration with Linux compilation workload > 1) Live Migration Time: > Optimization v.s. Legacy = 8816ms v.s. 54201ms > --> 84% reduction > 2) Linux Compilation Time: > Optimization v.s. Legacy = 8min30s v.s. 8min36s > --> no obvious difference > > ChangeLog: > v36->v37: > - free the reported pages to mm when receives a DONE cmd from host. > Please see patch 1's commit log for reasons. Please see patch 1's > commit for detailed explanations. > > For ChangeLogs from v22 to v36, please reference > https://lkml.org/lkml/2018/7/20/199 > > For ChangeLogs before v21, please reference > https://lwn.net/Articles/743660/ > > Wei Wang (3): > virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT > mm/page_poison: expose page_poisoning_enabled to kernel modules > virtio-balloon: VIRTIO_BALLOON_F_PAGE_POISON > > drivers/virtio/virtio_balloon.c | 374 ++++++++++++++++++++++++++++++++---- > include/uapi/linux/virtio_balloon.h | 8 + > mm/page_poison.c | 6 + > 3 files changed, 355 insertions(+), 33 deletions(-) >