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On large systems, the memory used by loaded metaslabs can become a concern. While range trees are a fairly efficient data structure, on heavily fragmented pools they can still consume a significant amount of memory. This problem is amplified when we fail to unload metaslabs that we aren't using. Currently, we only unload a metaslab during metaslab_sync_done; in order for that function to be called on a given metaslab in a given txg, we have to have dirtied that metaslab in that txg. If the dirtying was the result of an allocation, we wouldn't be unloading it (since it wouldn't be 8 txgs since it was selected), so in effect we only unload a metaslab during txgs where it's being freed from. We move the unload logic from sync_done to a new function, and call that function on all metaslabs in a given vdev during vdev_sync_done(). Reviewed-by: Richard Elling <Richard.Elling@RichardElling.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Paul Dagnelie <pcd@delphix.com> Closes #8837 |
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| .. | ||
| linux | ||
| spl | ||
| sys | ||
| .gitignore | ||
| libnvpair.h | ||
| libuutil_common.h | ||
| libuutil_impl.h | ||
| libuutil.h | ||
| libzfs_core.h | ||
| libzfs_impl.h | ||
| libzfs.h | ||
| libzutil.h | ||
| Makefile.am | ||
| thread_pool.h | ||
| zfeature_common.h | ||
| zfs_comutil.h | ||
| zfs_deleg.h | ||
| zfs_fletcher.h | ||
| zfs_namecheck.h | ||
| zfs_prop.h | ||