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[Qemu-devel] [RFC PATCH 00/17] COarse-grain LOck-stepping(COLO) Virtual
From: |
Yang Hongyang |
Subject: |
[Qemu-devel] [RFC PATCH 00/17] COarse-grain LOck-stepping(COLO) Virtual Machines for Non-stop Service |
Date: |
Wed, 23 Jul 2014 22:25:21 +0800 |
Virtual machine (VM) replication is a well known technique for
providing application-agnostic software-implemented hardware fault
tolerance "non-stop service". COLO is a high availability solution.
Both primary VM (PVM) and secondary VM (SVM) run in parallel. They
receive the same request from client, and generate response in parallel
too. If the response packets from PVM and SVM are identical, they are
released immediately. Otherwise, a VM checkpoint (on demand) is
conducted. The idea is presented in Xen summit 2012, and 2013,
and academia paper in SOCC 2013. It's also presented in KVM forum
2013:
http://www.linux-kvm.org/wiki/images/1/1d/Kvm-forum-2013-COLO.pdf
Please refer to above document for detailed information.
Please also refer to previous posted RFC proposal:
http://lists.nongnu.org/archive/html/qemu-devel/2014-06/msg05567.html
The patchset is also hosted on github:
https://github.com/macrosheep/qemu/tree/colo_v0.1
This patchset is RFC, implements the frame of colo, without
failover and nic/disk replication. But it is ready for demo
the COLO idea above QEMU-Kvm.
Steps using this patchset to get an overview of COLO:
1. configure the source with --enable-colo option
2. compile
3. just like QEMU's normal migration, run 2 QEMU VM:
- Primary VM
- Secondary VM with -incoming tcp:[IP]:[PORT] option
4. on Primary VM's QEMU monitor, run following command:
migrate_set_capability colo on
migrate tcp:[IP]:[PORT]
5. done
you will see two runing VMs, whenever you make changes to PVM, SVM
will be synced to PVM's state.
TODO list:
1. failover
2. nic replication
3. disk replication[COLO Disk manager]
Any comments/feedbacks are warmly welcomed.
Thanks,
Yang
Yang Hongyang (17):
configure: add CONFIG_COLO to switch COLO support
COLO: introduce an api colo_supported() to indicate COLO support
COLO migration: add a migration capability 'colo'
COLO info: use colo info to tell migration target colo is enabled
COLO save: integrate COLO checkpointed save into qemu migration
COLO restore: integrate COLO checkpointed restore into qemu restore
COLO buffer: implement colo buffer as well as QEMUFileOps based on it
COLO: disable qdev hotplug
COLO ctl: implement API's that communicate with colo agent
COLO ctl: introduce is_slave() and is_master()
COLO ctl: implement colo checkpoint protocol
COLO ctl: add a RunState RUN_STATE_COLO
COLO ctl: implement colo save
COLO ctl: implement colo restore
COLO save: reuse migration bitmap under colo checkpoint
COLO ram cache: implement colo ram cache on slaver
HACK: trigger checkpoint every 500ms
Makefile.objs | 2 +
arch_init.c | 174 +++++++++-
configure | 14 +
include/exec/cpu-all.h | 1 +
include/migration/migration-colo.h | 36 +++
include/migration/migration.h | 13 +
include/qapi/qmp/qerror.h | 3 +
migration-colo-comm.c | 78 +++++
migration-colo.c | 643 +++++++++++++++++++++++++++++++++++++
migration.c | 45 ++-
qapi-schema.json | 9 +-
stubs/Makefile.objs | 1 +
stubs/migration-colo.c | 34 ++
vl.c | 12 +
14 files changed, 1044 insertions(+), 21 deletions(-)
create mode 100644 include/migration/migration-colo.h
create mode 100644 migration-colo-comm.c
create mode 100644 migration-colo.c
create mode 100644 stubs/migration-colo.c
--
1.9.1
- [Qemu-devel] [RFC PATCH 00/17] COarse-grain LOck-stepping(COLO) Virtual Machines for Non-stop Service,
Yang Hongyang <=
- [Qemu-devel] [RFC PATCH 01/17] configure: add CONFIG_COLO to switch COLO support, Yang Hongyang, 2014/07/23
- [Qemu-devel] [RFC PATCH 03/17] COLO migration: add a migration capability 'colo', Yang Hongyang, 2014/07/23
- [Qemu-devel] [RFC PATCH 04/17] COLO info: use colo info to tell migration target colo is enabled, Yang Hongyang, 2014/07/23
- [Qemu-devel] [RFC PATCH 05/17] COLO save: integrate COLO checkpointed save into qemu migration, Yang Hongyang, 2014/07/23
- [Qemu-devel] [RFC PATCH 06/17] COLO restore: integrate COLO checkpointed restore into qemu restore, Yang Hongyang, 2014/07/23
- [Qemu-devel] [RFC PATCH 08/17] COLO: disable qdev hotplug, Yang Hongyang, 2014/07/23
- [Qemu-devel] [RFC PATCH 07/17] COLO buffer: implement colo buffer as well as QEMUFileOps based on it, Yang Hongyang, 2014/07/23
- [Qemu-devel] [RFC PATCH 09/17] COLO ctl: implement API's that communicate with colo agent, Yang Hongyang, 2014/07/23