Playing with background snapshots in combination with hugetlb and
virtio-mem, I found two issues and some reasonable optimizations (skip
unprotecting when unregistering).
With virtio-mem (RamDiscardManager), we now won't be allocating unnecessary
page tables for unplugged ranges when using uffd-wp with shmem/hugetlb.
Cc: Juan Quintela <quint...@redhat.com> (maintainer:Migration)
Cc: "Dr. David Alan Gilbert" <dgilb...@redhat.com> (maintainer:Migration)
Cc: Peter Xu <pet...@redhat.com>
Cc: Andrey Gruzdev <andrey.gruz...@virtuozzo.com>
David Hildenbrand (5):
migration/ram: Fix populate_read_range()
migration/ram: Fix error handling in ram_write_tracking_start()
migration/ram: Don't explicitly unprotect when unregistering uffd-wp
migration/ram: Rely on used_length for uffd_change_protection()
migration/ram: Optimize ram_write_tracking_start() for
RamDiscardManager
migration/ram.c | 54 ++++++++++++++++++++++++++++++++++++-------------
1 file changed, 40 insertions(+), 14 deletions(-)
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2.39.0
