This is the 8th 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 is treated as a separate series.
As usual, we provide 'basic' and 'developing' branches in github: https://github.com/coloft/qemu/commits/colo-v1.5-basic https://github.com/coloft/qemu/commits/colo-v1.5-developing (more features) The 'basic' branch is exactly the same with this patch series, We will keep this series simple as possible, just for easy review. The extra features in colo-v1.5-developing branch: 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. 3) You get the statistic info about checkpoint by command 'info migrate' Please reference to the follow link to test COLO. http://wiki.qemu.org/Features/COLO. COLO is a totally new feature which is still in early stage, your comments and feedback are warmly welcomed. NOTE: We have decided to re-implement the colo proxy in userspace (In qemu exactly). you can find the discussion about why & how to realize the colo proxy in qemu from the follow link: http://lists.nongnu.org/archive/html/qemu-devel/2015-07/msg04069.html TODO: 1. COLO function switch on/off 2. The capability of continuous FT 3. Optimize the performance. v8: - Move some global variables into MigrationIncomingState and MigrationState - Move some cleanup work form colo thread and colo incoming thread into failover BH function and also fix the code logic for the cleanup work. - fix the bug that colo thread and colo incoming thread possibly block in the socket 'recv' call when do failover work. - Optimize colo_flush_ram_cache() - Add migration state for incoming side, we use the state to verify if migration incoming side is in COLO state or not (Patch 5). - Drop the patch 'COLO: Disable qdev hotplug when VM is in COLO mode', since it is not correct. zhanghailiang (34): configure: Add parameter for configure to enable/disable COLO support migration: Introduce capability 'colo' to migration COLO: migrate colo related info to slave colo-comm/migration: skip colo info section for special cases migration: Add state records for migration incoming 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: Introduce state to record failover process COLO failover: Implement COLO primary/secondary vm failover work qmp event: Add event notification for COLO error COLO failover: Don't do failover during loading VM's state COLO: Add new command parameter 'forward_nic' 'colo_script' for net COLO NIC: Init/remove colo nic devices when add/cleanup tap devices tap: Make launch_script() public COLO NIC: Implement colo nic device interface configure() colo-nic: Handle secondary VM's original net device configure COLO NIC: Implement colo nic init/destroy function COLO NIC: Some init work related with proxy module COLO: Handle nfnetlink message from proxy module COLO: Do checkpoint according to the result of packets comparation COLO: Improve checkpoint efficiency by do additional periodic checkpoint COLO: Add colo-set-checkpoint-period command COLO NIC: Implement NIC checkpoint and failover COLO: Implement shutdown checkpoint COLO: Add block replication into colo process configure | 33 +- docs/qmp/qmp-events.txt | 16 + hmp-commands.hx | 30 ++ hmp.c | 15 + hmp.h | 2 + include/exec/cpu-all.h | 1 + include/migration/colo.h | 45 +++ include/migration/failover.h | 33 ++ include/migration/migration.h | 19 + include/migration/qemu-file.h | 3 +- include/net/colo-nic.h | 37 ++ include/net/net.h | 2 + include/net/tap.h | 19 + include/sysemu/sysemu.h | 3 + migration/Makefile.objs | 2 + migration/colo-comm.c | 75 ++++ migration/colo-failover.c | 83 +++++ migration/colo.c | 805 ++++++++++++++++++++++++++++++++++++++++++ migration/migration.c | 116 ++++-- migration/qemu-file-buf.c | 58 +++ migration/ram.c | 242 ++++++++++++- migration/savevm.c | 2 +- net/Makefile.objs | 1 + net/colo-nic.c | 457 ++++++++++++++++++++++++ net/net.c | 2 + net/tap.c | 90 +++-- qapi-schema.json | 58 ++- qapi/event.json | 15 + qemu-options.hx | 7 + qmp-commands.hx | 42 +++ scripts/colo-proxy-script.sh | 145 ++++++++ stubs/Makefile.objs | 1 + stubs/migration-colo.c | 58 +++ trace-events | 10 + vl.c | 37 +- 35 files changed, 2474 insertions(+), 90 deletions(-) create mode 100644 include/migration/colo.h create mode 100644 include/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 net/colo-nic.c create mode 100755 scripts/colo-proxy-script.sh create mode 100644 stubs/migration-colo.c -- 1.8.3.1
