Re: [Qemu-devel] [PATCH COLO-Frame v5 00/29] COarse-grain LOck-stepping(COLO) Virtual Machines for Non-stop Service

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

* zhanghailiang (zhang.zhanghailiang@huawei.com) wrote:
> This is the 5th version of COLO, here is only COLO frame part, include: VM checkpoint,
> failover, proxy API, block replication API, not include block replication.
> The block part has been sent by wencongyang:
> "[Qemu-devel] [PATCH COLO-Block v5 00/15] Block replication for continuous checkpoints"
> 
> we have finished some new features and optimization on COLO (As a development branch in github),
> but for easy of review, it is better to keep it simple now, so we will not add too much new 
> codes into this frame patch set before it been totally reviewed. 
> 
> You can get the latest integrated qemu colo patches from github (Include Block part):
> https://github.com/coloft/qemu/commits/colo-v1.2-basic
> https://github.com/coloft/qemu/commits/colo-v1.2-developing (more features)
> 
> Please NOTE the difference between these two branch.
> colo-v1.2-basic is exactly same with this patch series, which has basic features of COLO.
> Compared with colo-v1.2-basic, colo-v1.2-developing has some optimization in the 
> process of checkpoint, including: 
>    1) separate ram and device save/load process to reduce size of extra memory
>       used during checkpoint
>    2) live migrate part of dirty pages to slave during sleep time.
> Besides, we add some statistic info in colo-v1.2-developing, which you can get these stat
> info by using command 'info migrate'.
> 
> You can test any branch of the above, 
> about how to test COLO, Please reference to the follow link.
> http://wiki.qemu.org/Features/COLO.

Thanks, I'll try these out over the next few days.
It would be good to use some tags on the colo-proxy git;
it would be a bit confusing for people trying to use your previous
qemu patches if they fetched todays colo-proxy tree.

Dave

> 
> COLO is still in early stage, 
> your comments and feedback are warmly welcomed.
> 
> Cc: netfilter-devel@vger.kernel.org
> 
> TODO:
> 1. Strengthen failover
> 2. COLO function switch on/off
> 2. Optimize proxy part, include proxy script.
>   1) Remove the limitation of forward network link.
>   2) Reuse the nfqueue_entry and NF_STOLEN to enqueue skb
> 3. The capability of continuous FT
> 
> v5:
> - Replace the previous communication way between proxy and qemu with nfnetlink
> - Remove the 'forward device'parameter of xt_PMYCOLO, and now we use iptables command
> to set the 'forward device'
> - Turn DPRINTF into trace_ calls as Dave's suggestion
> 
> v4:
> - New block replication scheme (use image-fleecing for sencondary side)
> - Adress some comments from Eric Blake and Dave
> - Add commmand colo-set-checkpoint-period to set the time of periodic checkpoint
> - Add a delay (100ms) between continuous checkpoint requests to ensure VM
>   run 100ms at least since last pause.
> v3:
> - use proxy instead of colo agent to compare network packets
> - add block replication
> - Optimize failover disposal
> - handle shutdown
> 
> v2:
> - use QEMUSizedBuffer/QEMUFile as COLO buffer
> - colo support is enabled by default
> - add nic replication support
> - addressed comments from Eric Blake and Dr. David Alan Gilbert
> 
> v1:
> - implement the frame of colo
> 
> Wen Congyang (1):
>   COLO: Add block replication into colo process
> 
> zhanghailiang (28):
>   configure: Add parameter for configure to enable/disable COLO support
>   migration: Introduce capability 'colo' to migration
>   COLO: migrate colo related info to slave
>   migration: Integrate COLO checkpoint process into migration
>   migration: Integrate COLO checkpoint process into loadvm
>   COLO: Implement colo checkpoint protocol
>   COLO: Add a new RunState RUN_STATE_COLO
>   QEMUSizedBuffer: Introduce two help functions for qsb
>   COLO: Save VM state to slave when do checkpoint
>   COLO RAM: Load PVM's dirty page into SVM's RAM cache temporarily
>   COLO VMstate: Load VM state into qsb before restore it
>   arch_init: Start to trace dirty pages of SVM
>   COLO RAM: Flush cached RAM into SVM's memory
>   COLO failover: Introduce a new command to trigger a failover
>   COLO failover: Implement COLO master/slave failover work
>   COLO failover: Don't do failover during loading VM's state
>   COLO: Add new command parameter 'colo_nicname' 'colo_script' for net
>   COLO NIC: Init/remove colo nic devices when add/cleanup tap devices
>   COLO NIC: Implement colo nic device interface configure()
>   COLO NIC : Implement colo nic init/destroy function
>   COLO NIC: Some init work related with proxy module
>   COLO: Handle nfnetlink message from proxy module
>   COLO: Do checkpoint according to the result of packets comparation
>   COLO: Improve checkpoint efficiency by do additional periodic
>     checkpoint
>   COLO: Add colo-set-checkpoint-period command
>   COLO NIC: Implement NIC checkpoint and failover
>   COLO: Disable qdev hotplug when VM is in COLO mode
>   COLO: Implement shutdown checkpoint
> 
>  arch_init.c                            | 243 +++++++++-
>  configure                              |  36 +-
>  hmp-commands.hx                        |  30 ++
>  hmp.c                                  |  14 +
>  hmp.h                                  |   2 +
>  include/exec/cpu-all.h                 |   1 +
>  include/migration/migration-colo.h     |  57 +++
>  include/migration/migration-failover.h |  22 +
>  include/migration/migration.h          |   3 +
>  include/migration/qemu-file.h          |   3 +-
>  include/net/colo-nic.h                 |  27 ++
>  include/net/net.h                      |   3 +
>  include/sysemu/sysemu.h                |   3 +
>  migration/Makefile.objs                |   2 +
>  migration/colo-comm.c                  |  68 +++
>  migration/colo-failover.c              |  48 ++
>  migration/colo.c                       | 836 +++++++++++++++++++++++++++++++++
>  migration/migration.c                  |  60 ++-
>  migration/qemu-file-buf.c              |  58 +++
>  net/Makefile.objs                      |   1 +
>  net/colo-nic.c                         | 420 +++++++++++++++++
>  net/tap.c                              |  45 +-
>  qapi-schema.json                       |  42 +-
>  qemu-options.hx                        |  10 +-
>  qmp-commands.hx                        |  41 ++
>  savevm.c                               |   2 +-
>  scripts/colo-proxy-script.sh           |  88 ++++
>  stubs/Makefile.objs                    |   1 +
>  stubs/migration-colo.c                 |  58 +++
>  trace-events                           |  11 +
>  vl.c                                   |  39 +-
>  31 files changed, 2235 insertions(+), 39 deletions(-)
>  create mode 100644 include/migration/migration-colo.h
>  create mode 100644 include/migration/migration-failover.h
>  create mode 100644 include/net/colo-nic.h
>  create mode 100644 migration/colo-comm.c
>  create mode 100644 migration/colo-failover.c
>  create mode 100644 migration/colo.c
>  create mode 100644 net/colo-nic.c
>  create mode 100755 scripts/colo-proxy-script.sh
>  create mode 100644 stubs/migration-colo.c
> 
> -- 
> 1.7.12.4
> 
> 
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK