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authorPaul Dagnelie <pcd@delphix.com>2019-06-06 19:10:43 -0700
committerBrian Behlendorf <behlendorf1@llnl.gov>2019-06-06 19:10:43 -0700
commit893a6d62c1895f3e3eeb660b048236571995a564 (patch)
tree051154a79d6a6cc07ba4e93ed60a1b6a7f5b0763 /include/sys/metaslab.h
parent876d76be3455ba6aa8d1567203847d8c012d05c9 (diff)
Allow metaslab to be unloaded even when not freed from
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
Diffstat (limited to 'include/sys/metaslab.h')
-rw-r--r--include/sys/metaslab.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/sys/metaslab.h b/include/sys/metaslab.h
index 2790d06c7..330902529 100644
--- a/include/sys/metaslab.h
+++ b/include/sys/metaslab.h
@@ -50,6 +50,7 @@ int metaslab_init(metaslab_group_t *, uint64_t, uint64_t, uint64_t,
void metaslab_fini(metaslab_t *);
int metaslab_load(metaslab_t *);
+void metaslab_potentially_unload(metaslab_t *, uint64_t);
void metaslab_unload(metaslab_t *);
uint64_t metaslab_allocated_space(metaslab_t *);