Brian Behlendorf 0873bb6337 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> Closes #6171 Closes #6852 Closes #6989		2018-01-08 09:52:36 -08:00
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avl	Remove dead code from AVL tree	2017-10-05 19:28:00 -07:00
icp	Linux 4.14 compat: CONFIG_GCC_PLUGIN_RANDSTRUCT	2017-11-28 17:33:48 -06:00
nvpair	Linux 4.14 compat: CONFIG_GCC_PLUGIN_RANDSTRUCT	2017-11-28 17:33:48 -06:00
unicode	codebase style improvements for OpenZFS 6459 port	2017-01-22 13:25:40 -08:00
zcommon	Suppress incorrect objtool warnings	2017-12-07 10:28:50 -08:00
zfs	Fix ARC hit rate	2018-01-08 09:52:36 -08:00
.gitignore	Improve gitignore	2017-05-25 10:14:13 -07:00
Makefile.in	Retire legacy test infrastructure	2017-08-15 17:26:38 -07:00