Public bug reported:

SRU Justification

Impact: Shiftfs does not mark it's slab cache as reclaimable. While this
is not a big deal it is not nice to the kernel in general. The shiftfs
cache is not so important that it can't be reclaimed.

Regression Potential: Limited to shiftfs. This patch has been tested for
multiple days and has not caused any regressions.

Test Case:
Open a lot of files in shiftfs to get them into the cache and then cause memory 
pressure via e.g. stress-ng and see if the shiftfs cache shrinks.

Target Kernels: All LTS kernels with shiftfs support.

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Christian Brauner (cbrauner)
         Status: In Progress

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

** Changed in: linux (Ubuntu)
     Assignee: (unassigned) => Christian Brauner (cbrauner)

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https://bugs.launchpad.net/bugs/1842059

Title:
  shiftfs: mark kmem_cache as reclaimable

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