K 10
svn:author
V 3
cem
K 8
svn:date
V 27
2016-03-16T04:22:32.527947Z
K 7
svn:log
V 981
fail(9): Upstreaming some fail point enhancements

This is several year's worth of fail point upgrades done at EMC Isilon. They
are interdependent enough that it makes sense to put a single diff up for them.
Primarily, we added:

- Changing all mainline execution paths to be lockless, which lets us use fail
  points in more sleep-sensitive areas, and allows more parallel execution
- A number of additional commands, including 'pause' that lets us do some
  interesting deterministic repros of race conditions
- The ability to dump the stacks of all threads sleeping on a fail point
- A number of other API changes to allow marking up the fail point's context in
  the code, and firing callbacks before and after execution
- A man page update

Submitted by:	Matthew Bryan <matthew.bryan@isilon.com>
Reviewed by:	cem (earlier version), jhb, kib, pho
With feedback from:	bdrewery
Sponsored by:	EMC / Isilon Storage Division
Differential Revision:	https://reviews.freebsd.org/D5427

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