4764 Need a way to get tsc deltas
Reviewed by: Keith M Wesolowski <wesolows@foobazco.org>
Reviewed by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
Reviewed by: Dan McDonald <danmcd@omniti.com>
Reviewed by: Garrett D'Amore <garrett@damore.org>
Approved by: Richard Lowe <richlowe@richlowe.net>
4754 io issued to near-full luns even after setting noalloc threshold
4755 mg_alloc_failures is no longer needed
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: Dan McDonald <danmcd@omniti.com>
Approved by: Dan McDonald <danmcd@omniti.com>
4772 $C prints no output on crash dump following dtrace panic()
Reviewed by: Sebastien Roy <sebastien.roy@delphix.com>
Reviewed by: Eric Schrock <eric.schrock@delphix.com>
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Richard Lowe <richlowe@richlowe.net>
Approved by: Eric Schrock <eric.schrock@delphix.com>
	[illumos-gate merge]

commit 8e50396accfa540cbe0b549256487d237e3d02f3
    4772 $C prints no output on crash dump following dtrace panic()
commit b6240e830b871f59c22a3918aebb3b36c872edba
    4754 io issued to near-full luns even after setting noalloc threshold
    4755 mg_alloc_failures is no longer needed

Conflicts:
	usr/src/uts/common/fs/zfs/metaslab.c (OS-2711)