* 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