Intro
=====
This patch series implements postcopy live migration.[1]
As discussed at KVM forum 2011, dedicated character device is used for
distributed shared memory between migration source and destination.
Now we can discuss/benchmark/compare with precopy. I believe there are
much rooms for improvement.
[1] http://wiki.qemu.org/Features/PostCopyLiveMigration
Usage
=====
You need load umem character device on the host before starting migration.
Postcopy can be used for tcg and kvm accelarator. The implementation depend
on only linux umem character device. But the driver dependent code is split
into a file.
I tested only host page size == guest page size case, but the implementation
allows host page size != guest page size case.
The following options are added with this patch series.
- incoming part
command line options
-postcopy [-postcopy-flags<flags>]
where flags is for changing behavior for benchmark/debugging
Currently the following flags are available
0: default
1: enable touching page request
example:
qemu -postcopy -incoming tcp:0:4444 -monitor stdio -machine accel=kvm
- outging part
options for migrate command
migrate [-p [-n]] URI
-p: indicate postcopy migration
-n: disable background transferring pages: This is for benchmark/debugging
example:
migrate -p -n tcp:<dest ip address>:4444
TODO
====
- benchmark/evaluation. Especially how async page fault affects the result.