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c13c4153f7
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 |
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| libdecnumber | ||
| migration | ||
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| standard-headers | ||
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| qemu-common.h | ||
| qemu-io.h | ||
| trace-tcg.h | ||