diff options
Diffstat (limited to 'module/zfs/refcount.c')
| -rw-r--r-- | module/zfs/refcount.c | 21 |
1 files changed, 14 insertions, 7 deletions
diff --git a/module/zfs/refcount.c b/module/zfs/refcount.c index e43807c8e..49980efcc 100644 --- a/module/zfs/refcount.c +++ b/module/zfs/refcount.c @@ -20,6 +20,7 @@ */ /* * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. + * Copyright (c) 2012 by Delphix. All rights reserved. */ #include <sys/zfs_context.h> @@ -32,7 +33,7 @@ int reference_tracking_enable = FALSE; /* runs out of memory too easily */ #else int reference_tracking_enable = TRUE; #endif -int reference_history = 4; /* tunable */ +int reference_history = 3; /* tunable */ static kmem_cache_t *reference_cache; static kmem_cache_t *reference_history_cache; @@ -64,6 +65,14 @@ refcount_create(refcount_t *rc) offsetof(reference_t, ref_link)); rc->rc_count = 0; rc->rc_removed_count = 0; + rc->rc_tracked = reference_tracking_enable; +} + +void +refcount_create_untracked(refcount_t *rc) +{ + refcount_create(rc); + rc->rc_tracked = B_FALSE; } void @@ -96,14 +105,12 @@ refcount_destroy(refcount_t *rc) int refcount_is_zero(refcount_t *rc) { - ASSERT(rc->rc_count >= 0); return (rc->rc_count == 0); } int64_t refcount_count(refcount_t *rc) { - ASSERT(rc->rc_count >= 0); return (rc->rc_count); } @@ -113,14 +120,14 @@ refcount_add_many(refcount_t *rc, uint64_t number, void *holder) reference_t *ref = NULL; int64_t count; - if (reference_tracking_enable) { + if (rc->rc_tracked) { ref = kmem_cache_alloc(reference_cache, KM_PUSHPAGE); ref->ref_holder = holder; ref->ref_number = number; } mutex_enter(&rc->rc_mtx); ASSERT(rc->rc_count >= 0); - if (reference_tracking_enable) + if (rc->rc_tracked) list_insert_head(&rc->rc_list, ref); rc->rc_count += number; count = rc->rc_count; @@ -144,7 +151,7 @@ refcount_remove_many(refcount_t *rc, uint64_t number, void *holder) mutex_enter(&rc->rc_mtx); ASSERT(rc->rc_count >= number); - if (!reference_tracking_enable) { + if (!rc->rc_tracked) { rc->rc_count -= number; count = rc->rc_count; mutex_exit(&rc->rc_mtx); @@ -161,7 +168,7 @@ refcount_remove_many(refcount_t *rc, uint64_t number, void *holder) KM_PUSHPAGE); list_insert_head(&rc->rc_removed, ref); rc->rc_removed_count++; - if (rc->rc_removed_count >= reference_history) { + if (rc->rc_removed_count > reference_history) { ref = list_tail(&rc->rc_removed); list_remove(&rc->rc_removed, ref); kmem_cache_free(reference_history_cache, |