One of the 3 patches was included in the mainline kernel sometime ago.
It fixed SLAB, but not SLUB. The other two patches are now in the
mainline kernel and will appear in kernel 4.10-RC1. I'll re-test then.

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https://bugs.launchpad.net/bugs/1626564

Title:
  4.8 regression: SLAB is being used instead of SLUB

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Yakkety:
  Fix Released

Bug description:
  We're seeing hundreds of kernel worker threads being spawned with some
  actions, for example, after booting the desktop and hutting the
  brightness keys causes this.  On investigation, this occurs when
  CONFIG_SLAB is being used.

  1. Ubuntu traditionally uses CONFIG_SLUB, so we should use that instead of 
CONFIG_SLAB (why was it changed for Yakkety?)
  2. With CONFIG_SLUB I cannot reproduce the issue of the hundreds for worker 
threads
  3 CONFIG_SLUB seems more performant on the boot too over SLAB.

  Please re-enable the CONFIG_SLUB allocator as per the 4.4. Xenial
  configs.

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