From: "Dr. David Alan Gilbert" <dgilb...@redhat.com>
If the remote host, or networking dies during a migration, the socket can be
waiting for a long timeout, and migration_cancel can't complete the cancel
for a long time (and you can't start a new one to somewhere else).
(Where 'long' is the TCP timeout, that's ~15 mins)
This patch set uses the shutdown(2) syscall to unblock any write/sends that
are in progress to let the migrate_cancel happen quickly.
1/3: socket shutdown - An updated patch from my postcopy world to
add a shut_down method on QEMUFile - only
for 'socket' (where the syscall is supported).
2/3: Handle bi-directional communication for fd migration
- A patch from Cristian Klein to use the socket
QEMUFile for FDs that are passed in, if the FDs
are sockets; this is needed so that libvirt
migrations can take advantage of the other patches.
Again this patch (and its naming) come from the
postcopy world.
3/3: migration_cancel: shutdown migration socket
- A new patch that uses the shutdown in
migrate_fd_cancel
Note this does not fix the timeout if you try to migrate to an already dead
host;
the connect timeout is typically a much shorter 2 minutes anyway.
Dave
Cristian Klein (1):
Handle bi-directional communication for fd migration
Dr. David Alan Gilbert (2):
socket shutdown
migration_cancel: shutdown migration socket
include/migration/qemu-file.h | 10 ++++++++++
include/qemu/sockets.h | 7 +++++++
migration/fd.c | 24 ++++++++++++++++++++++--
migration/migration.c | 12 ++++++++++++
migration/qemu-file-unix.c | 23 +++++++++++++++++++----
migration/qemu-file.c | 12 ++++++++++++
6 files changed, 82 insertions(+), 6 deletions(-)
--
2.1.0
