K 10
svn:author
V 8
gallatin
K 8
svn:date
V 27
2018-05-07T15:24:03.531364Z
K 7
svn:log
V 570
Boost thread priority while changing CPU frequency

Boost the priority of user-space threads when they set
their affinity to a core to adjust its frequency.   This avoids a situation
where a CPU bound kernel thread with the same affinity is running on a
down-clocked core, and will "block" powerd from up-clocking the core
until the kernel thread yields.   This can lead to poor perfomance,
and to things potentially getting stuck on Giant.

Reviewed by:	kib (imp reviewed earlier version)
Sponsored by:	Netflix
Differential Revision:	https://reviews.freebsd.org/D15246

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