From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:37285) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UoF2T-0005X2-QC for qemu-devel@nongnu.org; Sun, 16 Jun 2013 11:38:46 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UoF2R-0000PD-Ic for qemu-devel@nongnu.org; Sun, 16 Jun 2013 11:38:45 -0400 Received: from e28smtp09.in.ibm.com ([122.248.162.9]:43254) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UoF2R-0000OU-1l for qemu-devel@nongnu.org; Sun, 16 Jun 2013 11:38:43 -0400 Received: from /spool/local by e28smtp09.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Sun, 16 Jun 2013 21:04:10 +0530 Received: from d28relay04.in.ibm.com (d28relay04.in.ibm.com [9.184.220.61]) by d28dlp01.in.ibm.com (Postfix) with ESMTP id 19534E0043 for ; Sun, 16 Jun 2013 21:07:57 +0530 (IST) Received: from d28av01.in.ibm.com (d28av01.in.ibm.com [9.184.220.63]) by d28relay04.in.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id r5GFcRnV30605346 for ; Sun, 16 Jun 2013 21:08:29 +0530 Received: from d28av01.in.ibm.com (loopback [127.0.0.1]) by d28av01.in.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id r5GFcV9w018915 for ; Sun, 16 Jun 2013 15:38:31 GMT From: Lei Li Date: Sun, 16 Jun 2013 23:37:26 +0800 Message-Id: <1371397053-4503-1-git-send-email-lilei@linux.vnet.ibm.com> Subject: [Qemu-devel] [PATCH 0/7 RFC] Localhost live migration List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Cc: lagarcia@br.ibm.com, aliguori@us.ibm.com, Lei Li , quintela@redhat.com Hi, This patch series tries to add localhost live migration support to Qemu. It is just a draft version which is far from completing and I am still working on, send it out to have your suggestions and make sure it is the way should be headed. Your comments are very appreciated! When doing localhost live migration, the host memory will balloon up during the period, might consume double memories for some time. So we want to add a new live migration mechanism localhost live migration. The plan is: 1) Add new command to do localhost migration. The qmp interface introduced like: { 'command': 'localhost-migrate', 'data': {'uri': 'str'} } 2) Use different mechanism than current live migration. The very basic work flow like: qemu on the source (the source and destination are both on localhost) | V Stop VM | V Create threads | V Page flipping through vmspice | V MADV_DONTNEED the ram pages which are already flipped | V Migration completes As stopping VM first, we expect/resume the page flipping through vmspice is fast enough to meet *live migration (low downtime). Notes: Currently the work flow is not exactly the same as description above. For the first step, the work flow we plan to implement is: stop VM and copy ram pages via unix domain socket, MADV_DONTNEED ram pages that already copied. After that, will replace to vmsplice mechanism instead of copying pages. TODO: - Working on the completing of ram copy and MADV_DONTNEED part. - Introduce a mechanism to exchange a PIPE via SCM_RIGHTS. - benchmark/evaluation. Lei Li (7): migration: export MIG_STATE_xxx flags savevm: export qemu_save_device_state() arch_init: add ram_madvise_free() migration-local: implementation of outgoing part migration-local: impelementation of incoming part migration-local: add option to command line for local incoming hmp:add hmp_localhost_migration interface Makefile.objs | 1 + arch_init.c | 13 ++++ hmp-commands.hx | 17 +++++ hmp.c | 13 ++++ hmp.h | 1 + include/migration/migration.h | 32 +++++++++ include/sysemu/sysemu.h | 1 + migration-local.c | 155 +++++++++++++++++++++++++++++++++++++++++ migration-unix.c | 60 ++++++++++++++++ migration.c | 8 -- qapi-schema.json | 14 ++++ qemu-options.hx | 9 +++ qmp-commands.hx | 22 ++++++ savevm.c | 2 +- vl.c | 14 ++++ 15 files changed, 353 insertions(+), 9 deletions(-) create mode 100644 migration-local.c