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userfaultfd.2: Add note about asynchronous event delivery 

Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Mike Rapoport 2017-05-01 08:43:18 +03:00 committed by Michael Kerrisk
parent 53004b3ba0
commit 20050169e1
1 changed files with 12 additions and 0 deletions
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@ -112,6 +112,18 @@ created for the child process,
which allows userfaultfd monitor to perform user-space paging
for the child process.
Unlike page faults which have to be synchronous and require
explicit or implicit wakeup,
all other events are delivered asynchronously and
the non-cooperative process resumes execution as
soon as manager executes
.BR read(2).
The userfaultfd manager should carefully synchronize calls
to UFFDIO_COPY with the events processing.
The current asynchronous model of the event delivery is optimal for
single threaded non-cooperative userfaultfd manager implementations.
.\" FIXME elaborate about non-cooperating mode, describe its limitations
.\" for kernels before 4.11, features added in 4.11
.\" and limitations remaining in 4.11