diff options
Diffstat (limited to 'usr/src')
| -rw-r--r-- | usr/src/uts/common/fs/zfs/dbuf.c | 18 |
1 files changed, 7 insertions, 11 deletions
diff --git a/usr/src/uts/common/fs/zfs/dbuf.c b/usr/src/uts/common/fs/zfs/dbuf.c index 23d4d3b0bf..64700c5ba6 100644 --- a/usr/src/uts/common/fs/zfs/dbuf.c +++ b/usr/src/uts/common/fs/zfs/dbuf.c @@ -561,19 +561,15 @@ dbuf_evict_notify(void) if (tsd_get(zfs_dbuf_evict_key) != NULL) return; + /* + * We check if we should evict without holding the dbuf_evict_lock, + * because it's OK to occasionally make the wrong decision here, + * and grabbing the lock results in massive lock contention. + */ if (refcount_count(&dbuf_cache_size) > dbuf_cache_max_bytes) { - boolean_t evict_now = B_FALSE; - - mutex_enter(&dbuf_evict_lock); - if (refcount_count(&dbuf_cache_size) > dbuf_cache_max_bytes) { - evict_now = dbuf_cache_above_hiwater(); - cv_signal(&dbuf_evict_cv); - } - mutex_exit(&dbuf_evict_lock); - - if (evict_now) { + if (dbuf_cache_above_hiwater()) dbuf_evict_one(); - } + cv_signal(&dbuf_evict_cv); } } |