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Avoid waiting in dmu_sync_late_arrival().

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The transaction there does not produce any dirty data or log blocks,
so it should not be throttled. All other cases wait for TXG sync, by
which time the log block we are writing will be obsolete, so we can
skip waiting and just return error here instead.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
Closes #15096
This commit is contained in:
Alexander Motin 2023-07-27 12:07:09 -04:00 committed by Brian Behlendorf
parent 0ae7bfc0a4
commit 02ce9030e6
1 changed files with 7 additions and 1 deletions
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8
module/zfs/dmu.c
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@ -1656,7 +1656,13 @@ dmu_sync_late_arrival(zio_t *pio, objset_t *os, dmu_sync_cb_t *done, zgd_t *zgd,
tx = dmu_tx_create(os);
dmu_tx_hold_space(tx, zgd->zgd_db->db_size);
if (dmu_tx_assign(tx, TXG_WAIT) != 0) {
/*
* This transaction does not produce any dirty data or log blocks, so
* it should not be throttled. All other cases wait for TXG sync, by
* which time the log block we are writing will be obsolete, so we can
* skip waiting and just return error here instead.
*/
if (dmu_tx_assign(tx, TXG_NOWAIT | TXG_NOTHROTTLE) != 0) {
dmu_tx_abort(tx);
/* Make zl_get_data do txg_waited_synced() */
return (SET_ERROR(EIO));