Public bug reported:

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

** Affects: linux (Ubuntu)
     Importance: High
         Status: New

** Tags: kernel-4.8

** Tags added: kernel-4.8

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

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  4.8 regression: SLAB is being used instead of SLUB

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