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Avoid two 64-bit divisions per scanned block 

Change math to make it like the ARC, using multiplications instead.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Motin <mav@FreeBSD.org>
Sponsored-By: iXsystems, Inc.
Closes #13591
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Alexander Motin 2022-06-27 14:08:21 -04:00 committed by GitHub
parent c0bf952c84
commit 1cd72b9c13
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 6 additions and 4 deletions
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10
module/zfs/dsl_scan.c
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@ -1342,12 +1342,13 @@ dsl_scan_check_suspend(dsl_scan_t *scn, const zbookmark_phys_t *zb)
uint64_t scan_time_ns = curr_time_ns - scn->scn_sync_start_time;
uint64_t sync_time_ns = curr_time_ns -
scn->scn_dp->dp_spa->spa_sync_starttime;
int dirty_pct = scn->scn_dp->dp_dirty_total * 100 / zfs_dirty_data_max;
uint64_t dirty_min_bytes = zfs_dirty_data_max *
zfs_vdev_async_write_active_min_dirty_percent / 100;
int mintime = (scn->scn_phys.scn_func == POOL_SCAN_RESILVER) ?
zfs_resilver_min_time_ms : zfs_scrub_min_time_ms;
if ((NSEC2MSEC(scan_time_ns) > mintime &&
(dirty_pct >= zfs_vdev_async_write_active_min_dirty_percent ||
(scn->scn_dp->dp_dirty_total >= dirty_min_bytes ||
txg_sync_waiting(scn->scn_dp) ||
NSEC2SEC(sync_time_ns) >= zfs_txg_timeout)) ||
spa_shutting_down(scn->scn_dp->dp_spa) ||
@ -2833,12 +2834,13 @@ scan_io_queue_check_suspend(dsl_scan_t *scn)
uint64_t scan_time_ns = curr_time_ns - scn->scn_sync_start_time;
uint64_t sync_time_ns = curr_time_ns -
scn->scn_dp->dp_spa->spa_sync_starttime;
int dirty_pct = scn->scn_dp->dp_dirty_total * 100 / zfs_dirty_data_max;
uint64_t dirty_min_bytes = zfs_dirty_data_max *
zfs_vdev_async_write_active_min_dirty_percent / 100;
int mintime = (scn->scn_phys.scn_func == POOL_SCAN_RESILVER) ?
zfs_resilver_min_time_ms : zfs_scrub_min_time_ms;
return ((NSEC2MSEC(scan_time_ns) > mintime &&
(dirty_pct >= zfs_vdev_async_write_active_min_dirty_percent ||
(scn->scn_dp->dp_dirty_total >= dirty_min_bytes ||
txg_sync_waiting(scn->scn_dp) ||
NSEC2SEC(sync_time_ns) >= zfs_txg_timeout)) ||
spa_shutting_down(scn->scn_dp->dp_spa));