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BRT: Skip duplicate BRT prefetches
If there is a pending entry for this block, then we've already issued BRT prefetch for it within this TXG, so don't do it again. BRT vdev lookup and following zap_prefetch_uint64() call can be pretty expensive and should be avoided when not necessary. Reviewed-by: Pawel Jakub Dawidek <pawel@dawidek.net> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored by: iXsystems, Inc. Closes #15941
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@ -1472,10 +1472,10 @@ brt_pending_add(spa_t *spa, const blkptr_t *bp, dmu_tx_t *tx)
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kmem_cache_free(brt_pending_entry_cache, newbpe);
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} else {
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ASSERT(bpe == NULL);
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}
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/* Prefetch BRT entry, as we will need it in the syncing context. */
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/* Prefetch BRT entry for the syncing context. */
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brt_prefetch(brt, bp);
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}
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}
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void
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