tree b4875300b2f5d8595f56e9e4a0803f6dab5aa4f8
parent 278e2f551a095b234de74dca9c214d5502a1f72c
author Andrey Gruzdev <andrey.gruzdev@virtuozzo.com> 1611915246 +0300
committer Dr. David Alan Gilbert <dgilbert@redhat.com> 1612783191 +0000

migration: implementation of background snapshot thread

Introducing implementation of 'background' snapshot thread
which in overall follows the logic of precopy migration
while internally utilizes completely different mechanism
to 'freeze' vmstate at the start of snapshot creation.

This mechanism is based on userfault_fd with wr-protection
support and is Linux-specific.

Signed-off-by: Andrey Gruzdev <andrey.gruzdev@virtuozzo.com>
Acked-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20210129101407.103458-5-andrey.gruzdev@virtuozzo.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>