• Merge branch 'master' into luporl-fix-vty
• Address review comments

Reviewed By: allanjude

After another look I found this change to be useless for me, since I need to load the memory into two different DMA engines same time. And it is easier to to without this functionality. So I'll leave this idea to somebody else who may actually need it. I've committed some changes slightly optimizing the area in other ways.

I think this looks good to me, thanks! It does behave differently now in that truss(1) will cause us to exit these syscalls if it attaches in the middle -- but every application I can think of using them will swiftly return to sigsuspend() state once it realizes nothing productive happened.

In D16457#489658, @tcberner wrote:

@mat is this stable enough to start play around with? Because for example Qt has many split ports that could be used as testing ground too (basically all the ports that have the same qt-dist value).

Sigh; don't change GENERIC.

Fix problem reported by Tom: when computing RTT, take the HZ into account; the 'rtt' argument is in ticks, not milliseconds. Thanks to Allan for tracking that down.

• bump D_VERSION
• annotate the lock in witness

This absolutely requires a bump for D_VERSION.
May be add explicit order between devmtx and si_threadlock to the witness static table.

Use PTRACE_SYSCALL.

Restore gap_end variable to fix findspace problem.

In D22540#492769, @tcberner wrote:

Lgtm, under the assumption, it works as before.

Style.
Unhold vnode for ADD.

Include full context.

LGTM

ping?