Memory consumption

[Tom Carroll <tcarroll@xxxxxxxxxxxxx>]

Hey everyone,

Here's the scenario:

I was backing up an XFS fs to a tape.  I was not able to complete
the backup due to the high memory consumption of the xfs related caching.

It appears that every inode I touch is cached and once an inode is 
cache it never expires.

Attached is log of /proc/slabinfo during a untarring of an archive
onto a XFS fs.

log
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