userfaultfd: non-cooperative: add madvise() event for MADV_REMOVE request
When a page is removed from a shared mapping, the uffd reader should be notified, so that it won't attempt to handle #PF events for the removed pages. We can reuse the UFFD_EVENT_REMOVE because from the uffd monitor point of view, the semantices of madvise(MADV_DONTNEED) and madvise(MADV_REMOVE) is exactly the same. Link: http://lkml.kernel.org/r/1484814154-1557-3-git-send-email-rppt@linux.vnet.ibm.com Signed-off-by:Mike Rapoport <rppt@linux.vnet.ibm.com> Reviewed-by:
Andrea Arcangeli <aarcange@redhat.com> Acked-by:
Hillf Danton <hillf.zj@alibaba-inc.com> Acked-by:
Pavel Emelyanov <xemul@virtuozzo.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
parent
d811914d
Please register or sign in to comment