diff options
Diffstat (limited to 'module/zfs/dmu_objset.c')
| -rw-r--r-- | module/zfs/dmu_objset.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/module/zfs/dmu_objset.c b/module/zfs/dmu_objset.c index 9f7cf5f4b..03b30dd3b 100644 --- a/module/zfs/dmu_objset.c +++ b/module/zfs/dmu_objset.c @@ -68,6 +68,13 @@ krwlock_t os_lock; */ int dmu_find_threads = 0; +/* + * Backfill lower metadnode objects after this many have been freed. + * Backfilling negatively impacts object creation rates, so only do it + * if there are enough holes to fill. + */ +int dmu_rescan_dnode_threshold = 1 << DN_MAX_INDBLKSHIFT; + static void dmu_objset_find_dp_cb(void *arg); void @@ -1152,6 +1159,13 @@ dmu_objset_sync(objset_t *os, zio_t *pio, dmu_tx_t *tx) if (dr->dr_zio) zio_nowait(dr->dr_zio); } + + /* Enable dnode backfill if enough objects have been freed. */ + if (os->os_freed_dnodes >= dmu_rescan_dnode_threshold) { + os->os_rescan_dnodes = B_TRUE; + os->os_freed_dnodes = 0; + } + /* * Free intent log blocks up to this tx. */ |