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Add zfs_object_mutex_size module option

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Add a zfs_object_mutex_size module option to facilitate resizing the
the per-dataset znode mutex array.  Increasing this value may help
make the deadlock described in #4106 less common, but this is not a
proper fix.  This patch is primarily to aid debugging and analysis.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Tim Chase <tim@chase2k.com>
Issue #4106
This commit is contained in:
Brian Behlendorf
2015-12-18 12:19:14 -08:00
parent d21f279a94
commit 0720116d4d
4 changed files with 26 additions and 12 deletions
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include/sys/zfs_vfsops.h
+1 -1
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@@ -112,7 +112,7 @@ typedef struct zfs_sb {
uint64_t z_groupquota_obj;
uint64_t z_replay_eof; /* New end of file - replay only */
sa_attr_type_t *z_attr_table; /* SA attr mapping->id */
#define ZFS_OBJ_MTX_SZ 256
uint64_t z_hold_mtx_size; /* znode hold locks size */
kmutex_t *z_hold_mtx; /* znode hold locks */
} zfs_sb_t;