[Qemu-devel] [RFC PATCH v5 0/4] Separate thread for VM migration

[Umesh Deshpande <udeshpan@redhat.com>]

Following patch series deals with VCPU and iothread starvation during the
migration of a guest. Currently the iothread is responsible for performing the
guest migration. It holds qemu_mutex during the migration and doesn't allow VCPU
to enter the qemu mode and delays its return to the guest. The guest migration,
executed as an iohandler also delays the execution of other iohandlers.
In the following patch series,

The migration has been moved to a separate thread to
reduce the qemu_mutex contention and iohandler starvation.

Umesh Deshpande (4):
  MRU ram block list
  migration thread mutex
  separate migration bitmap
  separate migration thread

 arch_init.c         |   38 ++++++++++++----
 buffered_file.c     |   75 +++++++++++++++++--------------
 cpu-all.h           |   42 +++++++++++++++++
 exec.c              |   97 ++++++++++++++++++++++++++++++++++++++--
 migration.c         |  122 +++++++++++++++++++++++++++++---------------------
 migration.h         |    9 ++++
 qemu-common.h       |    2 +
 qemu-thread-posix.c |   10 ++++
 qemu-thread.h       |    1 +
 savevm.c            |    5 --
 10 files changed, 297 insertions(+), 104 deletions(-)

-- 
1.7.4.1