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Description
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As discovered by Pavel Jakub Dawidek, while attempting to port the latest
ZFS changes to FreeBSD:
"After runing find(1) on file system with ~5.000.000 files and exporting
the pool I see that arc_meta_used is greater than zero."
Once the pool has been exported, there should be no residual meta-data left in the
ARC, so the arc_meta_used bean counter should report zero.
In tests on Solaris I have noted the same problem. We appear to be missing a
matching 'arc_space_return()' for one or more of the 'arc_space_consume()' calls.
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