Matthew Macy 1e4732cbda
Decouple arc_read_done callback from arc buf instantiation
Add ARC_FLAG_NO_BUF to indicate that a buffer need not be
instantiated.  This fixes a ~20% performance regression on
cached reads due to zfetch changes.

Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Signed-off-by: Matt Macy <mmacy@FreeBSD.org>
Closes #11220 
Closes #11232
2020-12-09 15:05:06 -08:00
..
2020-09-02 09:42:12 -07:00
2020-11-02 11:51:12 -08:00
2020-10-27 09:43:36 -07:00
2020-09-02 09:42:12 -07:00
2020-06-10 09:24:15 -07:00
2020-10-02 17:44:10 -07:00
2020-06-10 09:24:15 -07:00
2020-08-20 10:30:06 -07:00
2020-10-08 20:07:10 -07:00