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4fbc524955
Torn reads/writes of dp_dirty_total are unlikely: on 64-bit systems due to register size, while on 32-bit due to memory constraints. And even if we hit some race, the code implementing the delay takes the lock any way. Removal of the poll-wide lock acquisition saves ~1% of CPU time on 8-thread 8KB write workload. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Alexander Motin <mav@FreeBSD.org> Sponsored by: iXsystems, Inc. Closes #15390