Alexander Motin
40e02f49e9
Fix/improve dbuf hits accounting
...
Instead of clearing stats inside arc_buf_alloc_impl() do it inside
arc_hdr_alloc() and arc_release(). It fixes statistics being wiped
every time a new dbuf is filled from the ARC.
Remove b_l1hdr.b_l2_hits. L2ARC hits are accounted at b_l2hdr.b_hits.
Since the hits are accounted under hash lock, replace atomics with
simple increments.
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov >
Reviewed-by: George Wilson <george.wilson@delphix.com >
Signed-off-by: Alexander Motin <mav@FreeBSD.org >
Closes #12422
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