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28430b51e3
To simplify error handling bpobj_iterate_blkptrs() iterates through the list of block pointers backwards. Unfortunately speculative prefetcher is currently unable to detect such patterns, that makes each block read there synchronous and very slow on HDD pools. According to my tests, added explicit prefetch reduces time needed to asynchronously delete 8 snapshots of 4 million blocks each from 20 seconds to less than one, that should free sync thread for other useful work, such as async writes, scrub, etc. While there, plug one memory leak in case of bpobj_open() error and harmonize some variable names. Reviewed-by: Allan Jude <allan@klarasystems.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored by: iXsystems, Inc. Closes #15071 |
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