* Hailiang Zhang (zhang.zhanghaili...@huawei.com) wrote:
> On 2015/12/15 20:14, Dr. David Alan Gilbert wrote:
> >* zhanghailiang (zhang.zhanghaili...@huawei.com) wrote:
> >>This is the 12th version of COLO.
> >>
> >>As usual, this version of COLO is only support periodic checkpoint,
> >>just like MicroCheckpointing and Remus does.
> >>
> >>Here is only COLO frame part, you can get the whole codes from github:
> >>https://github.com/coloft/qemu/commits/colo-v2.3-periodic-mode
> >
> >Hi,
> > Have you tried wiring in Zhang Chen's new userland colo proxy yet?
> >I'd like to start trying it out.
> >
>
> Not yet, actually, for frame part, we can re-use most of the previous codes
> that based on
> kernel proxy. And, yes, please, you are welcome to join us. ;)
Yes, that's certainly something I'll look at immediately at the start of the
new year
(I'm out for 2 weeks from Friday).
I've just tested this series on my machines, and it works well.
Two things:
1) I just posted a patch to add an HMP equivalent to x-blockdev-change
2) If you run with an older machine type (e.g. pc-i440fx-2.3) then if I
failover to the
secondary then I hit a 'invalid runstate transition: 'inmigrate' ->
'prelaunch'';
I guess this is something to do with global_state.
Dave
> >Dave
> >
> >>Test procedure:
> >>1. Startup qemu
> >>Primary side:
> >>#x86_64-softmmu/qemu-system-x86_64 -enable-kvm -boot c -m 2048 -smp 2 -qmp
> >>stdio -vnc :7 -name primary -cpu qemu64,+kvmclock -device piix3-usb-uhci
> >>-device usb-tablet -netdev tap,id=hn0,vhost=off -device
> >>virtio-net-pci,id=net-pci0,netdev=hn0 -drive
> >>if=virtio,id=colo-disk0,driver=quorum,read-pattern=fifo,vote-threshold=1,children.0.file.filename=/mnt/sdd/pure_IMG/linux/redhat/rhel_6.5_64_2U_ide,children.0.driver=raw
> >>Secondary side:
> >>#x86_64-softmmu/qemu-system-x86_64 -boot c -m 2048 -smp 2 -qmp stdio -vnc
> >>:7 -name secondary -enable-kvm -cpu qemu64,+kvmclock -device piix3-usb-uhci
> >>-device usb-tablet -netdev tap,id=hn0,vhost=off -device
> >>virtio-net-pci,id=net-pci0,netdev=hn0 -drive
> >>if=none,id=colo-disk0,file.filename=/mnt/sdd/pure_IMG/linux/redhat/rhel_6.5_64_2U_ide,driver=raw,node-name=node0
> >> -drive
> >>if=virtio,id=active-disk0,throttling.bps-total=70000000,driver=replication,mode=secondary,file.driver=qcow2,file.file.filename=/mnt/ramfs/active_disk.img,file.backing.driver=qcow2,file.backing.file.filename=/mnt/ramfs/hidden_disk.img,file.backing.backing=colo-disk0
> >> -incoming tcp:0:8888
> >>2. On Secondary VM's QEMU monitor, issue command
> >>{'execute':'qmp_capabilities'}
> >>{'execute': 'nbd-server-start', 'arguments': {'addr': {'type': 'inet',
> >>'data': {'host': '192.168.2.88', 'port': '8889'} } } }
> >>{'execute': 'nbd-server-add', 'arguments': {'device': 'colo-disk0',
> >>'writable': true } }
> >>{'execute': 'trace-event-set-state', 'arguments': {'name': 'colo*',
> >>'enable': true} }
> >>
> >>3. On Primary VM's QEMU monitor, issue command:
> >>{'execute':'qmp_capabilities'}
> >>{'execute': 'human-monitor-command', 'arguments': {'command-line':
> >>'drive_add buddy
> >>driver=replication,mode=primary,file.driver=nbd,file.host=9.61.1.7,file.port=8889,file.export=colo-disk0,node-name=node0,if=none'}}
> >>{'execute':'x-blockdev-change', 'arguments':{'parent': 'colo-disk0',
> >>'node': 'node0' } }
> >>{'execute': 'migrate-set-capabilities', 'arguments': {'capabilities': [
> >>{'capability': 'x-colo', 'state': true } ] } }
> >>{'execute': 'migrate', 'arguments': {'uri': 'tcp:192.168.2.88:8888' } }
> >>
> >>4. After the above steps, you will see, whenever you make changes to PVM,
> >>SVM will be synced.
> >>You can by issue command '{ "execute": "migrate-set-parameters" ,
> >>"arguments":{ "x-checkpoint-delay": 2000 } }'
> >>to change the checkpoint period time.
> >>
> >>5. Failover test
> >>You can kill Primary VM and run 'x_colo_lost_heartbeat' in Secondary VM's
> >>monitor at the same time, then SVM will failover and client will not feel
> >>this
> >>change.
> >>
> >>Before issuing '{ "execute": "x-colo-lost-heartbeat" }' command, we have to
> >>issue block related command to stop block replication.
> >>Primary:
> >> Remove the nbd child from the quorum:
> >> { 'execute': 'x-blockdev-change', 'arguments': {'parent': 'colo-disk0',
> >> 'child': 'children.1'}}
> >> Note: there is no qmp command to remove the blockdev now
> >>
> >>Secondary:
> >> The primary host is down, so we should do the following thing:
> >> { 'execute': 'nbd-server-stop' }
> >>
> >>Please review, thanks.
> >>
> >>TODO:
> >>1. Implement packets compare module (proxy) in qemu (Doing)
> >>2. Checkpoint based on proxy in qemu
> >>3. The capability of continuous FT
> >>
> >>v12:
> >> - Fix the bug that default buffer filter broken vhost-net.
> >> - Add an flag in struct NetFilterState to help skipping default
> >> filter for packets travelling through filter layer.
> >> - Remove the default failover treatment which may cause split-brain.
> >> - Rename checkpoint-delay to x-checkpoint-delay.
> >> - Check if all netdev supports default filter before going into COLO.
> >> - Reconstruct send/receive helper functions in patch 10.
> >> - Address serveral other comments from Dave
> >>
> >>v11:
> >> - Re-implement buffer/release packets based on filter-buffer according
> >> to Jason Wang's suggestion. (patch 34, patch 36 ~ patch 38)
> >> - Rebase master to re-use some stuff introduced by post-copy.
> >> - Address several comments from Eric and Dave, the fixing record can
> >> be found in each patch.
> >>
> >>v10:
> >> - Rename 'colo_lost_heartbeat' command to experimental
> >> 'x_colo_lost_heartbeat'
> >> - Rename migration capability 'colo' to 'x-colo' (Eric's suggestion)
> >> - Simplify the process of primary side by dropping colo thread and reusing
> >> migration thread. (Dave's suggestion)
> >> - Add several netfilter related APIs to support buffer/release packets
> >> for COLO (patch 32 ~ patch 36)
> >>
> >>zhanghailiang (38):
> >> configure: Add parameter for configure to enable/disable COLO support
> >> migration: Introduce capability 'x-colo' to migration
> >> COLO: migrate colo related info to secondary node
> >> migration: Export migrate_set_state()
> >> migration: Add state records for migration incoming
> >> migration: Integrate COLO checkpoint process into migration
> >> migration: Integrate COLO checkpoint process into loadvm
> >> migration: Rename the'file' member of MigrationState
> >> COLO/migration: Create a new communication path from destination to
> >> source
> >> COLO: Implement colo checkpoint protocol
> >> COLO: Add a new RunState RUN_STATE_COLO
> >> QEMUSizedBuffer: Introduce two help functions for qsb
> >> COLO: Save PVM state to secondary side when do checkpoint
> >> ram: Split host_from_stream_offset() into two helper functions
> >> COLO: Load PVM's dirty pages into SVM's RAM cache temporarily
> >> ram/COLO: Record the dirty pages that SVM received
> >> COLO: Load VMState into qsb before restore it
> >> COLO: Flush PVM's cached RAM into SVM's memory
> >> COLO: Add checkpoint-delay parameter for migrate-set-parameters
> >> COLO: synchronize PVM's state to SVM periodically
> >> COLO failover: Introduce a new command to trigger a failover
> >> COLO failover: Introduce state to record failover process
> >> COLO: Implement failover work for Primary VM
> >> COLO: Implement failover work for Secondary VM
> >> qmp event: Add event notification for COLO error
> >> COLO failover: Shutdown related socket fd when do failover
> >> COLO failover: Don't do failover during loading VM's state
> >> COLO: Process shutdown command for VM in COLO state
> >> COLO: Update the global runstate after going into colo state
> >> savevm: Split load vm state function qemu_loadvm_state
> >> COLO: Separate the process of saving/loading ram and device state
> >> COLO: Split qemu_savevm_state_begin out of checkpoint process
> >> net/filter-buffer: Add default filter-buffer for each netdev
> >> filter-buffer: Accept zero interval
> >> filter-buffer: Introduce a helper function to enable/disable default
> >> filter
> >> filter-buffer: Introduce a helper function to release packets
> >> colo: Use default buffer-filter to buffer and release packets
> >> COLO: Add block replication into colo process
> >>
> >> configure | 11 +
> >> docs/qmp-events.txt | 17 +
> >> hmp-commands.hx | 15 +
> >> hmp.c | 15 +
> >> hmp.h | 1 +
> >> include/exec/ram_addr.h | 9 +-
> >> include/migration/colo.h | 38 +++
> >> include/migration/failover.h | 33 ++
> >> include/migration/migration.h | 18 +-
> >> include/migration/qemu-file.h | 3 +-
> >> include/net/filter.h | 12 +
> >> include/net/net.h | 5 +
> >> include/sysemu/sysemu.h | 9 +
> >> migration/Makefile.objs | 2 +
> >> migration/colo-comm.c | 71 ++++
> >> migration/colo-failover.c | 83 +++++
> >> migration/colo.c | 765
> >> ++++++++++++++++++++++++++++++++++++++++++
> >> migration/exec.c | 4 +-
> >> migration/fd.c | 4 +-
> >> migration/migration.c | 216 ++++++++----
> >> migration/postcopy-ram.c | 6 +-
> >> migration/qemu-file-buf.c | 61 ++++
> >> migration/ram.c | 213 ++++++++++--
> >> migration/rdma.c | 2 +-
> >> migration/savevm.c | 295 ++++++++++++----
> >> migration/tcp.c | 4 +-
> >> migration/unix.c | 4 +-
> >> net/filter-buffer.c | 127 ++++++-
> >> net/filter.c | 6 +-
> >> net/net.c | 58 ++++
> >> qapi-schema.json | 106 +++++-
> >> qapi/event.json | 17 +
> >> qmp-commands.hx | 24 +-
> >> stubs/Makefile.objs | 1 +
> >> stubs/migration-colo.c | 45 +++
> >> trace-events | 10 +
> >> vl.c | 37 +-
> >> 37 files changed, 2152 insertions(+), 195 deletions(-)
> >> create mode 100644 include/migration/colo.h
> >> create mode 100644 include/migration/failover.h
> >> create mode 100644 migration/colo-comm.c
> >> create mode 100644 migration/colo-failover.c
> >> create mode 100644 migration/colo.c
> >> create mode 100644 stubs/migration-colo.c
> >>
> >>--
> >>1.8.3.1
> >>
> >>
> >--
> >Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK
> >
> >.
> >
>
>
--
Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK
