Andrew Gallatin e7bd0750af 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
2018-05-07 15:24:03 +00:00
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