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Re: [Qemu-devel] [PATCH COLO-Frame v5 00/29] COarse-grain LOck-stepping(

From: zhanghailiang
Subject: Re: [Qemu-devel] [PATCH COLO-Frame v5 00/29] COarse-grain LOck-stepping(COLO) Virtual Machines for Non-stop Service
Date: Fri, 22 May 2015 14:26:46 +0800
User-agent: Mozilla/5.0 (Windows NT 6.1; rv:31.0) Gecko/20100101 Thunderbird/31.1.1

On 2015/5/21 19:30, Dr. David Alan Gilbert wrote:
* zhanghailiang (address@hidden) wrote:
This is the 5th version of COLO, here is only COLO frame part, include: VM 
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 

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 
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.

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.

Hi Dave,

I have put tags on the colo-proxy in github, thanks for your suggestion.
And one more thing, to test this new version, you have to rebuild your kernel 
and iptables,
since there are some modification :)


COLO is still in early stage,
your comments and feedback are warmly welcomed.

Cc: address@hidden

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

- Replace the previous communication way between proxy and qemu with nfnetlink
- Remove the 'forward device'parameter of xt_PMYCOLO, and now we use iptables 
to set the 'forward device'
- Turn DPRINTF into trace_ calls as Dave's suggestion

- 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.
- use proxy instead of colo agent to compare network packets
- add block replication
- Optimize failover disposal
- handle shutdown

- 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

- 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
   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


Dr. David Alan Gilbert / address@hidden / Manchester, UK


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