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| author | Wei Wang <wei.w.wang@intel.com> | 2018-12-11 16:24:53 +0800 |
|---|---|---|
| committer | Dr. David Alan Gilbert <dgilbert@redhat.com> | 2019-03-06 10:49:18 +0000 |
| commit | c13c4153f76db23cac06a12044bf4dd346764059 (patch) | |
| tree | edf502457b4037af991cb11f559f3b52b4bbc04c /python | |
| parent | 6eeb63f740874150d7b5921541948c29b920a21d (diff) | |
| download | qemu-c13c4153f76db23cac06a12044bf4dd346764059.zip qemu-c13c4153f76db23cac06a12044bf4dd346764059.tar.gz qemu-c13c4153f76db23cac06a12044bf4dd346764059.tar.bz2 | |
virtio-balloon: VIRTIO_BALLOON_F_FREE_PAGE_HINT
The new feature enables the virtio-balloon device to receive hints of
guest free pages from the free page vq.
A notifier is registered to the migration precopy notifier chain. The
notifier calls free_page_start after the migration thread syncs the dirty
bitmap, so that the free page optimization starts to clear bits of free
pages from the bitmap. It calls the free_page_stop before the migration
thread syncs the bitmap, which is the end of the current round of ram
save. The free_page_stop is also called to stop the optimization in the
case when there is an error occurred in the process of ram saving.
Note: balloon will report pages which were free at the time of this call.
As the reporting happens asynchronously, dirty bit logging must be
enabled before this free_page_start call is made. Guest reporting must be
disabled before the migration dirty bitmap is synchronized.
Signed-off-by: Wei Wang <wei.w.wang@intel.com>
CC: Michael S. Tsirkin <mst@redhat.com>
CC: Dr. David Alan Gilbert <dgilbert@redhat.com>
CC: Juan Quintela <quintela@redhat.com>
CC: Peter Xu <peterx@redhat.com>
Message-Id: <1544516693-5395-8-git-send-email-wei.w.wang@intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
dgilbert: Dropped kernel header update, fixed up CMD_ID_* name change
Diffstat (limited to 'python')
0 files changed, 0 insertions, 0 deletions