Alexander Motin 024932aae9 Use atomic for start_count in devstat_start_transaction().
Combined with earlier nstart/nend removal it allows to remove several locks
from request path of GEOM and few other places.  It would be cool if we had
more SMP-friendly statistics, but this helps too.

Sponsored by:	iXsystems, Inc.
2019-12-30 03:13:38 +00:00
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