* 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.
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
