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Re: [Qemu-devel] [RFC PATCH 00/17] COarse-grain LOck-stepping(COLO) Virt
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [Qemu-devel] [RFC PATCH 00/17] COarse-grain LOck-stepping(COLO) Virtual Machines for Non-stop Service |
Date: |
Fri, 1 Aug 2014 17:02:42 +0100 |
User-agent: |
Mutt/1.5.23 (2014-03-12) |
* Yang Hongyang (address@hidden) wrote:
> 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
Hi Yang,
Thanks for this set of patches (and I've replied to many individually).
> 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]
I wonder if there are any parts that can be borrowed from other code
to get it going; I notice that the reverse execution patchset
has a network packet record/replay mode:
https://lists.gnu.org/archive/html/qemu-devel/2014-07/msg00157.html
What was used for the nic comparison in the 2013 kvm forum paper?
Dave
>
> 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
>
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK
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