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[Kamal Mostafa <kamal@xxxxxxxxxxxxx>]

** Also affects: linux-raspi2 (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: linux-raspi2 (Ubuntu Xenial)
       Status: New => Fix Committed

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https://bugs.launchpad.net/bugs/1633516

Title:
  Enable CONFIG_USERFAULTFD

Status in linux-raspi2 package in Ubuntu:
  New
Status in linux-raspi2 source package in Xenial:
  Fix Committed

Bug description:
  Enable the userfaultfd() system call that allows to intercept and
  handle page faults in userland.

  How to test:

  stress-ng -v --userfaultfd 1 --metrics-brief --syslog --tz -t 180

  if disabled it will print:

  stress-ng-userfaultfd: userfaultfd                failed, errno = 38
  (Function not implemented)

  while, if enabled:

  stress-ng: debug: [445] starting stressors
  stress-ng: debug: [445] 1 stressor spawned
  stress-ng: debug: [446] stress-ng-userfaultfd: started [446] (instance 0)
  stress-ng: debug: [446] stress-ng-userfaultfd: exited [446] (instance 0)
  stress-ng: debug: [445] process [446] terminated
  stress-ng: info:  [445] successful run completed in 180.03s (3 mins, 0.03 secs)

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