K 10
svn:author
V 3
mjg
K 8
svn:date
V 27
2019-11-30T17:24:42.463166Z
K 7
svn:log
V 503
lockprof: use IPI-injecetd fences to fix hangs on stat dump and reset

The previously used quiesce_all_cpus walks all CPUs and waits until curthread
can run on them. Even on contemporary machines this becomes a significant
problem under load when it can literally take minutes for the operation to
complete. With the patch the stall is normally less than 1 second.

Reviewed by:	kib, jeff (previous version)
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D21740

END