K 10
svn:author
V 5
markj
K 8
svn:date
V 27
2019-02-13T17:50:01.476436Z
K 7
svn:log
V 566
Implement per-CPU pmap activation tracking for RISC-V.

This reduces the overhead of TLB invalidations by ensuring that we
only interrupt CPUs which are using the given pmap.  Tracking is
performed in pmap_activate(), which gets called during context switches:
from cpu_throw(), if a thread is exiting or an AP is starting, or
cpu_switch() for a regular context switch.

For now, pmap_sync_icache() still must interrupt all CPUs.

Reviewed by:	kib (earlier version), jhb
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D18874

END