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Reduce ZIO io_lock contention on sorted scrub. #13553

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Jun 15, 2022
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Reduce ZIO io_lock contention on sorted scrub. #13553

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19 changes: 15 additions & 4 deletions module/zfs/dsl_scan.c
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Original file line number Diff line number Diff line change
Expand Up @@ -280,6 +280,7 @@ typedef struct scan_io {
struct dsl_scan_io_queue {
dsl_scan_t *q_scn; /* associated dsl_scan_t */
vdev_t *q_vd; /* top-level vdev that this queue represents */
zio_t *q_zio; /* scn_zio_root child for waiting on IO */

/* trees used for sorting I/Os and extents of I/Os */
range_tree_t *q_exts_by_addr;
Expand Down Expand Up @@ -3036,15 +3037,19 @@ scan_io_queues_run_one(void *arg)
dsl_scan_io_queue_t *queue = arg;
kmutex_t *q_lock = &queue->q_vd->vdev_scan_io_queue_lock;
boolean_t suspended = B_FALSE;
range_seg_t *rs = NULL;
scan_io_t *sio = NULL;
range_seg_t *rs;
scan_io_t *sio;
zio_t *zio;
list_t sio_list;

ASSERT(queue->q_scn->scn_is_sorted);

list_create(&sio_list, sizeof (scan_io_t),
offsetof(scan_io_t, sio_nodes.sio_list_node));
zio = zio_null(queue->q_scn->scn_zio_root, queue->q_scn->scn_dp->dp_spa,
NULL, NULL, NULL, ZIO_FLAG_CANFAIL);
mutex_enter(q_lock);
queue->q_zio = zio;

/* Calculate maximum in-flight bytes for this vdev. */
queue->q_maxinflight_bytes = MAX(1, zfs_scan_vdev_limit *
Expand Down Expand Up @@ -3111,7 +3116,9 @@ scan_io_queues_run_one(void *arg)
scan_io_queue_insert_impl(queue, sio);
}

queue->q_zio = NULL;
mutex_exit(q_lock);
zio_nowait(zio);
list_destroy(&sio_list);
}

Expand Down Expand Up @@ -4076,6 +4083,7 @@ scan_exec_io(dsl_pool_t *dp, const blkptr_t *bp, int zio_flags,
dsl_scan_t *scn = dp->dp_scan;
size_t size = BP_GET_PSIZE(bp);
abd_t *data = abd_alloc_for_io(size, B_FALSE);
zio_t *pio;

if (queue == NULL) {
ASSERT3U(scn->scn_maxinflight_bytes, >, 0);
Expand All @@ -4084,6 +4092,7 @@ scan_exec_io(dsl_pool_t *dp, const blkptr_t *bp, int zio_flags,
cv_wait(&spa->spa_scrub_io_cv, &spa->spa_scrub_lock);
spa->spa_scrub_inflight += BP_GET_PSIZE(bp);
mutex_exit(&spa->spa_scrub_lock);
pio = scn->scn_zio_root;
} else {
kmutex_t *q_lock = &queue->q_vd->vdev_scan_io_queue_lock;

Expand All @@ -4092,12 +4101,14 @@ scan_exec_io(dsl_pool_t *dp, const blkptr_t *bp, int zio_flags,
while (queue->q_inflight_bytes >= queue->q_maxinflight_bytes)
cv_wait(&queue->q_zio_cv, q_lock);
queue->q_inflight_bytes += BP_GET_PSIZE(bp);
pio = queue->q_zio;
mutex_exit(q_lock);
}

ASSERT(pio != NULL);
count_block(scn, dp->dp_blkstats, bp);
zio_nowait(zio_read(scn->scn_zio_root, spa, bp, data, size,
dsl_scan_scrub_done, queue, ZIO_PRIORITY_SCRUB, zio_flags, zb));
zio_nowait(zio_read(pio, spa, bp, data, size, dsl_scan_scrub_done,
queue, ZIO_PRIORITY_SCRUB, zio_flags, zb));
}

/*
Expand Down