diff options
| -rw-r--r-- | module/zfs/dsl_scan.c | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/module/zfs/dsl_scan.c b/module/zfs/dsl_scan.c index 31e693149..6b9b04a0e 100644 --- a/module/zfs/dsl_scan.c +++ b/module/zfs/dsl_scan.c @@ -429,11 +429,14 @@ dsl_scan_sync_state(dsl_scan_t *scn, dmu_tx_t *tx) &scn->scn_phys, tx)); } +extern int zfs_vdev_async_write_active_min_dirty_percent; + static boolean_t dsl_scan_check_pause(dsl_scan_t *scn, const zbookmark_phys_t *zb) { uint64_t elapsed_nanosecs; int mintime; + int dirty_pct; /* we never skip user/group accounting objects */ if (zb && (int64_t)zb->zb_object < 0) @@ -449,12 +452,28 @@ dsl_scan_check_pause(dsl_scan_t *scn, const zbookmark_phys_t *zb) if (zb && zb->zb_level != 0) return (B_FALSE); + /* + * We pause if: + * - we have scanned for the maximum time: an entire txg + * timeout (default 5 sec) + * or + * - we have scanned for at least the minimum time (default 1 sec + * for scrub, 3 sec for resilver), and either we have sufficient + * dirty data that we are starting to write more quickly + * (default 30%), or someone is explicitly waiting for this txg + * to complete. + * or + * - the spa is shutting down because this pool is being exported + * or the machine is rebooting. + */ mintime = (scn->scn_phys.scn_func == POOL_SCAN_RESILVER) ? zfs_resilver_min_time_ms : zfs_scan_min_time_ms; elapsed_nanosecs = gethrtime() - scn->scn_sync_start_time; - if (elapsed_nanosecs / NANOSEC > zfs_txg_timeout || + dirty_pct = scn->scn_dp->dp_dirty_total * 100 / zfs_dirty_data_max; + if (elapsed_nanosecs / NANOSEC >= zfs_txg_timeout || (NSEC2MSEC(elapsed_nanosecs) > mintime && - txg_sync_waiting(scn->scn_dp)) || + (txg_sync_waiting(scn->scn_dp) || + dirty_pct >= zfs_vdev_async_write_active_min_dirty_percent)) || spa_shutting_down(scn->scn_dp->dp_spa)) { if (zb) { dprintf("pausing at bookmark %llx/%llx/%llx/%llx\n", |