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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linux	Linux 3.14 compat: IO acct, global_page_state, etc	2017-09-16 11:00:19 -07:00
sys	Fix ARC hit rate	2018-01-08 09:52:36 -08:00
libnvpair.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
libuutil_common.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
libuutil_impl.h	Support custom build directories and move includes	2010-09-08 12:38:56 -07:00
libuutil.h	Correct cppcheck errors	2017-09-19 12:17:29 -07:00
libzfs_core.h	Added no_scrub_restart flag to zpool reopen	2017-10-26 12:26:09 -07:00
libzfs_impl.h	Remove FRU and LIBTOPO Support	2017-09-18 17:06:40 -07:00
libzfs.h	Added no_scrub_restart flag to zpool reopen	2017-10-26 12:26:09 -07:00
Makefile.am	Retire legacy test infrastructure	2017-08-15 17:26:38 -07:00
thread_pool.h	Add libtpool (thread pools)	2017-08-09 15:31:08 -07:00
zfeature_common.h	Native Encryption for ZFS on Linux	2017-08-14 10:36:48 -07:00
zfs_comutil.h	Illumos #2882, #2883, #2900	2013-09-04 15:49:00 -07:00
zfs_deleg.h	Native Encryption for ZFS on Linux	2017-08-14 10:36:48 -07:00
zfs_fletcher.h	DLPX-44812 integrate EP-220 large memory scalability	2016-11-29 14:34:27 -08:00
zfs_namecheck.h	OpenZFS 7386 - zfs get does not work properly with bookmarks	2017-01-26 14:42:15 -08:00
zfs_prop.h	Native Encryption for ZFS on Linux	2017-08-14 10:36:48 -07:00