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Fix linux filesystem cache calculation #73

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Fix linux filesystem cache calculation #73

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Commits on Mar 2, 2016

  1. Fix linux filesystem cache calculation 

    Linux's "Cached" statistic in /proc/meminfo is highly misleading as it
contains swap-backed shmem. This is hard to reclaim at best, and not
at all reclaimable on systems without swap. It should be considered
actual_used, not actual_free.

A more reliable filesystem cache footprint can be calculated from the
file LRUs and the reclaimable slab cache, which is mostly filesystem
metadata like dentries and inodes.
    @hnaz
    hnaz committed Mar 2, 2016
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