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Increase ZFS_OBJ_MTX_SZ to 256

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Increasing this limit costs us 6144 bytes of memory per mounted
filesystem, but this is small price to pay for accomplishing
the following:

* Allows for up to 256-way concurreny when performing lookups
  which helps performance when there are a large number of
  processes.

* Minimizes the likelyhood of encountering the deadlock
  described in issue #1101.  Because vmalloc() won't strictly
  honor __GFP_FS there is still a very remote chance of a
  deadlock.  See the zfsonlinux/spl@043f9b57 commit.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #1101
This commit is contained in:
Brian Behlendorf 2012-11-27 13:32:57 -08:00
parent 0e20a31b4b
commit 30315d237b
1 changed files with 1 additions and 1 deletions
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2
include/sys/zfs_vfsops.h
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@ -87,7 +87,7 @@ 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 64
#define ZFS_OBJ_MTX_SZ 256
kmutex_t z_hold_mtx[ZFS_OBJ_MTX_SZ]; /* znode hold locks */
} zfs_sb_t;