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6482a27e81
For each block written or freed ZFS dirties ds_dbuf of the dataset. While dbuf_dirty() has a fast path for already dirty dbufs, it still require taking the lock and doing some things visible in profiler. Investigation shown ds_dbuf dirtying by dsl_dataset_block_born() and some of dsl_dataset_block_kill() are just not needed, since by the time they are called in sync context the ds_dbuf is already dirtied by dsl_dataset_sync(). Tests show this reducing large file deletion time by ~3% by saving CPU time of single-threaded part of the sync thread. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com> Closes #18028 |
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