Re: [PATCH v1 0/5] migration/ram: background snapshot fixes and optimiations

[Peter Xu <peterx@redhat.com>]

On Thu, Jan 05, 2023 at 01:45:23PM +0100, David Hildenbrand wrote:
> 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 <quintela@redhat.com> (maintainer:Migration)
> Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com> (maintainer:Migration)
> Cc: Peter Xu <peterx@redhat.com>
> Cc: Andrey Gruzdev <andrey.gruzdev@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

For the series:

Acked-by: Peter Xu <peterx@redhat.com>

Thanks,

-- 
Peter Xu