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Replace zf_rwlock with a mutex

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The rwlock implementation on linux does not perform as well as mutexes.
We can realize a performance benefit by replacing the zf_rwlock with a
mutex.  Local microbenchmarks show ~50% improvement, and over NFS we see
~5% improvement on several of the ZFS Performance Tests cases,
especially randwrite and seq_write.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com>
Reviewed-by: Olaf Faaland <faaland1@llnl.gov>
Signed-off-by: Matthew Ahrens <mahrens@delphix.com>
Closes #9062
This commit is contained in:
Matthew Ahrens
2019-07-25 11:57:58 -07:00
committed by Brian Behlendorf
parent 09276fde1c
commit 1ff46825e2
3 changed files with 12 additions and 23 deletions
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module/zfs/dnode.c
+1 -1
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@@ -752,7 +752,7 @@ dnode_move_impl(dnode_t *odn, dnode_t *ndn)
ASSERT(!RW_LOCK_HELD(&odn->dn_struct_rwlock));
ASSERT(MUTEX_NOT_HELD(&odn->dn_mtx));
ASSERT(MUTEX_NOT_HELD(&odn->dn_dbufs_mtx));
ASSERT(!RW_LOCK_HELD(&odn->dn_zfetch.zf_rwlock));
ASSERT(!MUTEX_HELD(&odn->dn_zfetch.zf_lock));
/* Copy fields. */
ndn->dn_objset = odn->dn_objset;