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Re: [Qemu-devel] [RFC PATCH v4 00/28] COarse-grain LOck-stepping(COLO) V
Dr. David Alan Gilbert
Re: [Qemu-devel] [RFC PATCH v4 00/28] COarse-grain LOck-stepping(COLO) Virtual Machines for Non-stop Service
Thu, 14 May 2015 17:09:13 +0100
* zhanghailiang (address@hidden) wrote:
> 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
> >>The main reason is that there is an known issue that still unsolved, we
> >>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 ...
Good; that should be a lot better.
> There are still some further tests need to be done, i will finish it as soon
> as possible.
> 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. ;)
I'll be happy to try that.
> >>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
> >>- 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
> >> 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
> >Dr. David Alan Gilbert / address@hidden / Manchester, UK
Dr. David Alan Gilbert / address@hidden / Manchester, UK