K 10
svn:author
V 4
jeff
K 8
svn:date
V 27
2018-02-20T00:06:07.282785Z
K 7
svn:log
V 729
Further parallelize the buffer cache.

Provide multiple clean queues partitioned into 'domains'.  Each domain manages
its own bufspace and has its own bufspace daemon.  Each domain has a set of
subqueues indexed by the current cpuid to reduce lock contention on the cleanq.

Refine the sleep/wakeup around the bufspace daemon to use atomics as much as
possible.

Add a B_REUSE flag that is used to requeue bufs during the scan to approximate
LRU rather than locking the queue on every use of a frequently accessed buf.

Implement bufspace_reserve with only atomic_fetchadd to avoid loop restarts.

Reviewed by:	markj
Tested by:	pho
Sponsored by:	Netflix, Dell/EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D14274

END