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Re: [Qemu-devel] [RFC PATCH v4 00/28] COarse-grain LOck-stepping(COLO) V
From: |
Dr. David Alan Gilbert |
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 13:14:19 +0100 |
User-agent: |
Mutt/1.5.23 (2014-03-12) |
* zhanghailiang (address@hidden) wrote:
> This is the 4th 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:
> [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:
> https://github.com/coloft/qemu/commits/colo-v1.1
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.
Dave
> About how to test COLO, Please reference to the follow link.
> http://wiki.qemu.org/Features/COLO.
>
> Please review and test.
>
> Known issue still unsolved:
> (1) Some pages dirtied without setting its corresponding dirty-bitmap.
>
> Previous posted RFC patch series:
> http://lists.nongnu.org/archive/html/qemu-devel/2014-06/msg05567.html
> http://lists.nongnu.org/archive/html/qemu-devel/2014-09/msg04459.html
> https://lists.gnu.org/archive/html/qemu-devel/2015-02/msg04771.html
>
> 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
>
> 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 (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
> 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 | 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
>
> --
> 1.7.12.4
>
>
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK