Syncing task from Mir.

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https://bugs.launchpad.net/bugs/1583959

Title:
  mir_proving_server with INTEL_DEBUG=perf says: CPU mapping a busy
  miptree BO stalled and took 0.078 ms.

Status in Mir:
  New
Status in mir package in Ubuntu:
  New

Bug description:
  mir_proving_server with INTEL_DEBUG=perf says this when some clients
  (hardware or software) run:

  CPU mapping a busy miptree BO stalled and took 0.078 ms.
  CPU mapping a busy miptree BO stalled and took 0.038 ms.
  CPU mapping a busy miptree BO stalled and took 0.005 ms.
  CPU mapping a busy miptree BO stalled and took 0.002 ms.
  CPU mapping a busy miptree BO stalled and took 0.000 ms.
  CPU mapping a busy miptree BO stalled and took 0.000 ms.
  CPU mapping a busy miptree BO stalled and took 0.000 ms.
  CPU mapping a busy miptree BO stalled and took 0.000 ms.
  CPU mapping a busy miptree BO stalled and took 0.080 ms.
  CPU mapping a busy miptree BO stalled and took 0.128 ms.
  CPU mapping a busy miptree BO stalled and took 0.005 ms.
  CPU mapping a busy miptree BO stalled and took 0.002 ms.
  CPU mapping a busy miptree BO stalled and took 0.004 ms.
  CPU mapping a busy miptree BO stalled and took 0.002 ms.
  CPU mapping a busy miptree BO stalled and took 0.002 ms.
  CPU mapping a busy miptree BO stalled and took 0.004 ms.
  CPU mapping a busy miptree BO stalled and took 0.146 ms.
  CPU mapping a busy miptree BO stalled and took 0.089 ms.
  CPU mapping a busy miptree BO stalled and took 0.008 ms.
  CPU mapping a busy miptree BO stalled and took 0.002 ms.
  CPU mapping a busy miptree BO stalled and took 0.002 ms.
  CPU mapping a busy miptree BO stalled and took 0.001 ms.
  CPU mapping a busy miptree BO stalled and took 0.001 ms.
  CPU mapping a busy miptree BO stalled and took 0.001 ms.
  CPU mapping a busy miptree BO stalled and took 0.000 ms.
  CPU mapping a busy miptree BO stalled and took 0.001 ms.

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