userfaultfd: add new syscall to provide memory externalization
Once an userfaultfd has been created and certain region of the process virtual address space have been registered into it, the thread responsible for doing the memory externalization can manage the page faults in userland by talking to the kernel using the userfaultfd protocol. poll() can be used to know when there are new pending userfaults to be read (POLLIN). Signed-off-by: NAndrea Arcangeli <aarcange@redhat.com> Acked-by: NPavel Emelyanov <xemul@parallels.com> Cc: Sanidhya Kashyap <sanidhya.gatech@gmail.com> Cc: zhang.zhanghailiang@huawei.com Cc: "Kirill A. Shutemov" <kirill@shutemov.name> Cc: Andres Lagar-Cavilla <andreslc@google.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Rik van Riel <riel@redhat.com> Cc: Mel Gorman <mgorman@suse.de> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Hugh Dickins <hughd@google.com> Cc: Peter Feiner <pfeiner@google.com> Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: "Huangpeng (Peter)" <peter.huangpeng@huawei.com> Cc: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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fs/userfaultfd.c
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