- Copy stable/10 (r259064) to releng/10.0 as part of the
10.0-RELEASE cycle.
- Update __FreeBSD_version [1]
- Set branch name to -RC1

[1] 10.0-CURRENT __FreeBSD_version value ended at '55', so
start releng/10.0 at '100' so the branch is started with
a value ending in zero.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Spelling.

Submitted by: dougb

Note that it is still not possible to guard special kind of allocations, those
that have special relationships with uma(9). Currently only mbuf clusters.

Document that memguard(9) now can guard uma(9) allocations.

Rework memguard(9) to reserve significantly more KVA to detect
use-after-free over a longer time. Also release the backing pages of
a guarded allocation at free(9) time to reduce the overhead of using
memguard(9). Allow setting and varying the malloc type at run-time.
Add knobs to allow:

- randomly guarding memory
- adding un-backed KVA guard pages to detect underflow and overflow
- a lower limit on the size of allocations that are guarded

Reviewed by: alc
Reviewed by: brueffer, Ulrich Spörlein <uqs spoerlein net> (man page)
Silence from: -arch
Approved by: zml (mentor)
MFC after: 1 month

Markup fixes.

Document how to find a short description of a memory type.

Xref redzone(9)

Update manual page after last memguard changes.

Glanced at by: simon

First cut at a manpage for the MemGuard debugging allocator.

most content from: bmilekic
mdoc lessons by: ru