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Re: [Qemu-devel] [RFC PATCH v4 00/28] COarse-grain LOck-stepping(COLO) V

From: zhanghailiang
Subject: Re: [Qemu-devel] [RFC PATCH v4 00/28] COarse-grain LOck-stepping(COLO) Virtual Machines for Non-stop Service
Date: Thu, 14 May 2015 20:58:35 +0800
User-agent: Mozilla/5.0 (Windows NT 6.1; rv:31.0) Gecko/20100101 Thunderbird/31.1.1

On 2015/5/14 20:14, Dr. David Alan Gilbert wrote:
* zhanghailiang (address@hidden) wrote:
This is the 4th 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:
[RFC PATCH COLO v2 00/13] Block replication for continuous checkpoints

Compared with last version, there aren't too much optimize and new functions.
The main reason is that there is an known issue that still unsolved, we found
some dirty pages which have been missed setting bit in corresponding bitmap.
And it will trigger strange problem in VM.
We hope to resolve it before add more codes.

You can get the newest integrated qemu colo patches from github:

I thought I'd just say I've got the remotes/origin/colo_huawei_v4.7 off Wen's
git running here on one of my pair of machines.

This set of hosts is mostly OK running colo; the proxy module still gets
upset sometimes; but mostly on errors;  if the colo-proxy-script fails
during startup, I get RCU stalls; but if the script works, colo normally
works on this setup.

Hi Dave,

I'm trying to optimize the proxy module codes, and yes, the 'lock' we used in 
proxy module
was a little messy before, and i have finished rewriting the part of 
communication between qemu
and proxy, also removing the parameter of xt_PMYCOLO module ...

There are still some further tests need to be done, i will finish it as soon as 
I hope to send the next version in next week. And you can test the branch of 
Wen's temporarily,
Except block part, there is no difference in COLO framework between his branch 
and mine. ;)


About how to test COLO, Please reference to the follow link.

Please review and test.

Known issue still unsolved:
(1) Some pages dirtied without setting its corresponding dirty-bitmap.

Previous posted RFC patch series:

TODO list:
1 Optimize the process of checkpoint, shorten the time-consuming:
   (Partly done, patch is not include into this series)
    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.
2 Add more debug/stat info
   (Partly done, patch is not include into this series)
   include checkpoint count, proxy discompare count, downtime,
    number of live migrated pages, total sent pages, etc.
3 Strengthen failover
4 optimize proxy part, include proxy script.
5 The capability of continuous FT

- 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 (27):
   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: Do checkpoint according to the result of net packets comparing
   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                            | 199 +++++++-
  configure                              |  14 +
  hmp-commands.hx                        |  30 ++
  hmp.c                                  |  14 +
  hmp.h                                  |   2 +
  include/exec/cpu-all.h                 |   1 +
  include/migration/migration-colo.h     |  58 +++
  include/migration/migration-failover.h |  22 +
  include/migration/migration.h          |   3 +
  include/migration/qemu-file.h          |   3 +-
  include/net/colo-nic.h                 |  25 +
  include/net/net.h                      |   4 +
  include/sysemu/sysemu.h                |   3 +
  migration/Makefile.objs                |   2 +
  migration/colo-comm.c                  |  80 ++++
  migration/colo-failover.c              |  48 ++
  migration/colo.c                       | 809 +++++++++++++++++++++++++++++++++
  migration/migration.c                  |  60 ++-
  migration/qemu-file-buf.c              |  58 +++
  net/Makefile.objs                      |   1 +
  net/colo-nic.c                         | 438 ++++++++++++++++++
  net/tap.c                              |  45 +-
  qapi-schema.json                       |  42 +-
  qemu-options.hx                        |  10 +-
  qmp-commands.hx                        |  41 ++
  savevm.c                               |   2 +-
  scripts/colo-proxy-script.sh           |  97 ++++
  stubs/Makefile.objs                    |   1 +
  stubs/migration-colo.c                 |  58 +++
  vl.c                                   |  36 +-
  30 files changed, 2178 insertions(+), 28 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 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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