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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

Commit was acked by Tejun Heo.  We can cherry pick this into Ubuntu once
it lands in mainline.

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

** Tags added: kernel-da-key

** Changed in: linux (Ubuntu)
       Status: Confirmed => Triaged

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https://bugs.launchpad.net/bugs/1572025

Title:
  Regression for mmap writes through FUSE in 4.2+

Status in linux package in Ubuntu:
  Triaged

Bug description:
  I apologize for being brief but all necessary details are behind the
  links below.

  Report:
  http://thread.gmane.org/gmane.linux.kernel/2132944

  Discussion:
  https://lkml.org/lkml/2016/3/16/260

  Patch:
  [writeback: Fix performance regression in wb_over_bg_thresh()]
  https://lkml.org/lkml/2016/3/10/21

  Patch was tested by Jakob Unterwurzacher and seems to have fixed the issue.
  Reverting to 3.13 or 3.19 works around the issue on 14.04.

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