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For kernels which do not implement a per-suberblock shrinker, those older than Linux 3.1, the shrink_dcache_parent() function was used to attempt to reclaim dentries. This was found not be entirely reliable and could lead to performance issues on older kernels running meta-data heavy workloads. To address this issue a zfs_sb_prune_aliases() function has been added to implement this functionality. It relies on traversing the list of znodes for a filesystem and adding them to a private list with a reference held. The private list can then be safely walked outside the z_znodes_lock to prune dentires and drop the last reference so the inode can be freed. This provides the same synchronous behavior as the per-filesystem shrinker and has the advantage of depending on only long standing interfaces. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tim Chase <tim@chase2k.com> Closes #3501 |
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