** Also affects: linux (Ubuntu Yakkety)
   Importance: High
       Status: New

** Changed in: linux (Ubuntu Yakkety)
       Status: New => In Progress

** Changed in: linux (Ubuntu Yakkety)
     Assignee: (unassigned) => Tim Gardner (timg-tpi)

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  4.8 regression: SLAB is being used instead of SLUB

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Yakkety:
  In Progress

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 
  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

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