Merge r286744-r287584 from head.

Merge ^/head r286858 through r287489.

Summary: Add the interactivity equations to the header comment for our
interactivity calculation routine.

Suggested by: rwatson

Catch up with head, primarily for the 1.14.4.0 firmware.

Merge ^/head r285924 through r286421.

kgdb uses td_oncpu to determine if a thread is running and should use
a pcb from stoppcbs[] rather than the thread's PCB. However, exited threads
retained td_oncpu from the last time they ran, and n

kgdb uses td_oncpu to determine if a thread is running and should use
a pcb from stoppcbs[] rather than the thread's PCB. However, exited threads
retained td_oncpu from the last time they ran, and newborn threads had their
CPU fields cleared to zero during fork and thread creation since they are
in the set of fields zeroed when threads are setup. To fix, explicitly
update the CPU fields for exiting threads in sched_throw() to reflect the
switch out and reset the CPU fields for new threads in sched_fork_thread()
to NOCPU.

Reviewed by: kib
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D3193

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Merge ^/head r285341 through r285792.

Change the mb() use in the sched_ult tdq_notify() and sched_idletd()
to more C11-ish atomic_thread_fence_seq_cst().

Note that on PowerPC, which currently uses lwsync for mb(), the change
actually fi

Change the mb() use in the sched_ult tdq_notify() and sched_idletd()
to more C11-ish atomic_thread_fence_seq_cst().

Note that on PowerPC, which currently uses lwsync for mb(), the change
actually fixes the missed store/load barrier, intended by r271604 [*].

Reviewed by: alc
Noted by: alc [*]
Sponsored by: The FreeBSD Foundation
MFC after: 3 weeks

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Merge ^/head r285153 through r285283.

Relocate sched_random() within the SMP section.

Place sched_random nearer to where it's first used: moving the
code nearer to where it is used makes the code easier to read
and we can reduce the in

Relocate sched_random() within the SMP section.

Place sched_random nearer to where it's first used: moving the
code nearer to where it is used makes the code easier to read
and we can reduce the initial "#ifdef SMP" island.

Reword a little the comment and clean some whitespaces
while here.

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Merge sync of head

MFH: r278968-r280640

Sponsored by: The FreeBSD Foundation

Merge r278538 through r280226.

Merge ^/head r279995 through r280029.

Merge from head

Use sbuf_new_for_sysctl() instead of plain sbuf_new() to ensure sysctl
string returned to userland is nulterminated.

PR: 195668

Merge from head

Merge ^/head r279313 through r279595.

Merge r278538 through r279514.

Put back Andy's void for gcc happiness.

Submitted by: jchandra@

Make sched_random() return an unsigned number, and use uint32_t
consistently. This also matches the per-cpu pointer declaration
anyway.

This changes the tweak we give to the load from -32..31 to be

Make sched_random() return an unsigned number, and use uint32_t
consistently. This also matches the per-cpu pointer declaration
anyway.

This changes the tweak we give to the load from -32..31 to be 0..31
which seems more inline with the rest of the code (- rnd and the -=
64). It should also provide the randomness we need, and may fix a
signedness bug in the old code (it isn't clear that the effect was
intentional as opposed to sloppy, and the right shift of a signed
value is undefined to boot).

This stores sched_balance() behavior when it used random().

Differential Revision: https://reviews.freebsd.org/D1981

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Fix sched_ule on sparc64, gcc complains sched_random is not a correct
prototype.

Sponsored by: The FreeBSD Foundation

sched_random is only called for SMP, only define it there.

Sponsored by: The FreeBSD Foundation

Create sched_rand() and move the LCG code into that. Call this when
we need randomness in ULE. This removes random() call from the
rebalance interval code.

Submitted by: Harrison Grundy
Differential

Create sched_rand() and move the LCG code into that. Call this when
we need randomness in ULE. This removes random() call from the
rebalance interval code.

Submitted by: Harrison Grundy
Differential Revision: https://reviews.freebsd.org/D1968

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Reintegrate head revisions r273096-r277147

Sponsored by: The FreeBSD Foundation