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[Paolo Pisati <1712598@xxxxxxxxxxxxxxxxxx>]

** Changed in: linux-raspi2 (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1712598

Title:
  Fix OOM errors

Status in linux-raspi2 package in Ubuntu:
  Invalid
Status in linux-raspi2 source package in Xenial:
  Fix Released

Bug description:
  SRU:
  The original report for this bug is this one:

  http://bugs.launchpad.net/bugs/1655842

  but since the raspi2 kernel has a well isolated solution that doesn't
  affect (and doesn't apply) to the other kernels mentioned there, i
  decided to spawn this bug and use it as a reference instead of
  polluting the above LP bug with details and information that don't
  pertain there.

  Impact:
  People are reporting OOM errors on RaspberryPI2/3, in particular when running
  KDE or chromium, and the problem disappears when they go back to a kernel previous
  than 4.4.0-1044.51.

  This is actually a fallout from a previous attempt to fix a memory
  corruption in the usb stack and that was triggered during boot when
  mmc was mounted:

  BugLink: http://bugs.launchpad.net/bugs/1665280

  While trying to 'fix' the above problem, some patches that deal with
  OOM and memory presseure situaions were reverted and led to this
  situation - by reverting back these changes we fix the OOM errors (see
  comments #90, #91, #92 and #93 in the original LP bug) as reported by
  users, while the memory corruption problem doesn't show up anymore.

  Fix:
  Test a kernel with the following reverts reverted:

  080aca8 Revert "mm: consider compaction feedback also for costly allocation"
  486bab1 Revert "mm, oom, compaction: prevent from should_compact_retry looping for ever for costly orders"
  7b84469 Revert "mm, oom: protect !costly allocations some more for !CONFIG_COMPACTION"
  19724e4 Revert "mm, oom: prevent premature OOM killer invocation for high order request"
  4b8b650 Revert "PM / wakeirq: Fix dedicated wakeirq for drivers not using autosuspend"

  How to test:
  People have reported out of memory erros while running KDE and/or chromium, so the best way to reproduce this problem is to install KDE, open ~20 konqueror windows, execute chromium, and opens ~10 tabs on different web sites - if the kernel doesn't oops, the fix is working.

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