K 10
svn:author
V 5
mmacy
K 8
svn:date
V 27
2018-05-10T17:55:24.873887Z
K 7
svn:log
V 407
Add simple preempt safe epoch API

Read locking is over used in the kernel to guarantee liveness. This API makes
it easy to provide livenes guarantees without atomics.

Includes epoch_test kernel module to stress test the API.

Documentation will follow initial use case.

Test case and improvements to preemption handling in response to discussion
with mjg@

Reviewed by:	imp@, shurd@
Approved by:	sbruno@

END