94520ca462
To maintain a strict limit on the metadata contained in the arc, while preventing the arc buffer headers from completely consuming the "arc_meta_used" space, we need to evict metadata buffers from the arc's ghost lists along with the regular lists. This change modifies arc_adjust_meta such that it more closely models the adjustments made in arc_adjust. "arc_meta_used" is used similarly to "arc_size", and "arc_meta_limit" is used similarly to "arc_c". Testing metadata intensive workloads (e.g. creating, copying, and removing millions of small files and/or directories) has shown this change to make a dramatic improvement to the hit rate maintained in the arc. While I think there is still room for improvement, this is a big step in the right direction. In addition, zpl_free_cached_objects was made into a no-op as I'm not yet sure how to properly implement that function. Signed-off-by: Prakash Surya <surya1@llnl.gov> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue #2110 |
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