Alexander Motin bbbac409fe 9433 Fix ARC hit rate ... When the compressed ARC feature was added in commit d3c2ae1 the method of reference counting in the ARC was modified. As part of this accounting change the arc_buf_add_ref() function was removed entirely. This would have be fine but the arc_buf_add_ref() function served a second undocumented purpose of updating the ARC access information when taking a hold on a dbuf. Without this logic in place a cached dbuf would not migrate its associated arc_buf_hdr_t to the MFU list. This would negatively impact the ARC hit rate, particularly on systems with a small ARC. This change reinstates the missing call to arc_access() from dbuf_hold() by implementing a new arc_buf_access() function. Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Tim Chase <tim@chase2k.com> Reviewed by: George Wilson <george.wilson@delphix.com> Reviewed-by: George Melikov <mail@gmelikov.ru> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>		2018-04-16 00:54:58 +00:00
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boot/zfs	Mark two things as unused (since they are only sometimes used) and	2017-12-03 04:55:33 +00:00
compat/opensolaris	Don't declare __assfail as static	2018-02-25 14:29:43 +00:00
contrib/opensolaris	9433 Fix ARC hit rate	2018-04-16 00:54:58 +00:00
dev	Assert that dtrace_probe() doesn't re-enter itself.	2018-04-10 13:47:09 +00:00