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a137d9f8f5
Add an admin-guide section covering UFFDIO_REGISTER_MODE_RWP: - sync and async fault models; - UFFDIO_RWPROTECT semantics; - UFFD_FEATURE_RWP_ASYNC; - UFFDIO_SET_MODE runtime mode flips. It also covers typical VMM working-set-tracking workflow from detection loop through sync-mode eviction and back to async. Link: https://lore.kernel.org/20260708111417.173443-16-kirill@shutemov.name Signed-off-by: Kiryl Shutsemau <kas@kernel.org> Assisted-by: Claude:claude-opus-4-6 Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: David Hildenbrand <david@kernel.org> Cc: James Houghton <jthoughton@google.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Liam Howlett <liam@infradead.org> Cc: Lorenzo Stoakes <ljs@kernel.org> Cc: Mike Rapoport (Microsoft) <rppt@kernel.org> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Peter Xu <peterx@redhat.com> Cc: Sean Christopherson <seanjc@google.com> Cc: SeongJae Park <sj@kernel.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@kernel.org> Cc: Zi Yan <ziy@nvidia.com> Cc: kernel test robot <lkp@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>