svn commit: r194314 -
user/kmacy/releng_7_2_fcs/sys/cddl/contrib/opensolaris/uts/common/fs/zfs
Kip Macy
kmacy at FreeBSD.org
Tue Jun 16 23:29:53 UTC 2009
Author: kmacy
Date: Tue Jun 16 23:29:52 2009
New Revision: 194314
URL: http://svn.freebsd.org/changeset/base/194314
Log:
switch to read-only acquisition at moderately contended points
Modified:
user/kmacy/releng_7_2_fcs/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dbuf.c
user/kmacy/releng_7_2_fcs/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dnode.c
Modified: user/kmacy/releng_7_2_fcs/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dbuf.c
==============================================================================
--- user/kmacy/releng_7_2_fcs/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dbuf.c Tue Jun 16 23:02:46 2009 (r194313)
+++ user/kmacy/releng_7_2_fcs/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dbuf.c Tue Jun 16 23:29:52 2009 (r194314)
@@ -116,12 +116,12 @@ dbuf_find(dnode_t *dn, uint8_t level, ui
mutex_enter(DBUF_HASH_MUTEX(h, idx));
for (db = h->hash_table[idx]; db != NULL; db = db->db_hash_next) {
if (DBUF_EQUAL(db, os, obj, level, blkid)) {
- mutex_enter(&db->db_mtx);
+ rw_enter(&db->db_mtx, RW_READER);
if (db->db_state != DB_EVICTING) {
mutex_exit(DBUF_HASH_MUTEX(h, idx));
return (db);
}
- mutex_exit(&db->db_mtx);
+ rw_exit(&db->db_mtx);
}
}
mutex_exit(DBUF_HASH_MUTEX(h, idx));
Modified: user/kmacy/releng_7_2_fcs/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dnode.c
==============================================================================
--- user/kmacy/releng_7_2_fcs/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dnode.c Tue Jun 16 23:02:46 2009 (r194313)
+++ user/kmacy/releng_7_2_fcs/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dnode.c Tue Jun 16 23:29:52 2009 (r194314)
@@ -621,16 +621,16 @@ dnode_hold_impl(objset_impl_t *os, uint6
}
}
- mutex_enter(&dn->dn_mtx);
+ rw_enter(&dn->dn_mtx, RW_READER);
type = dn->dn_type;
if (dn->dn_free_txg ||
((flag & DNODE_MUST_BE_ALLOCATED) && type == DMU_OT_NONE) ||
((flag & DNODE_MUST_BE_FREE) && type != DMU_OT_NONE)) {
- mutex_exit(&dn->dn_mtx);
+ rw_exit(&dn->dn_mtx);
dbuf_rele(db, FTAG);
return (type == DMU_OT_NONE ? ENOENT : EEXIST);
}
- mutex_exit(&dn->dn_mtx);
+ rw_exit(&dn->dn_mtx);
if (refcount_add(&dn->dn_holds, tag) == 1)
dbuf_add_ref(db, dn);
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