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Illumos 5351, 5352 - scrub pauses

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5351 scrub goes for an extra second each txg
5352 scrub should pause when there is some dirty data

Author: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Alex Reece <alex.reece@delphix.com>
Reviewed by: Christopher Siden <christopher.siden@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Richard Elling <richard.elling@richardelling.com>
Approved by: Dan McDonald <danmcd@omniti.com>

References:
  https://www.illumos.org/issues/5351
  https://github.com/illumos/illumos-gate/commit/6f6a76a

Ported-by: Chris Dunlop <chris@onthe.net.au>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #3383
This commit is contained in:
Matthew Ahrens 2015-05-07 03:38:29 +10:00 committed by Brian Behlendorf
parent 08dc1b2ddd
commit 10400bfeac
1 changed files with 21 additions and 2 deletions
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23
module/zfs/dsl_scan.c
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@ -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",