Merge ^/head r305687 through r305890.

Renumber license clauses in sys/kern to avoid skipping #3

Merge ^/head r303250 through r304235.

Remove Giant from settime(), tc_setclock_mtx guards tc_windup() calls,
and there is no other issues with parallel settime(). Remove spl()
vestiges there as well.

Tested by: pho (as part of the whol

Remove Giant from settime(), tc_setclock_mtx guards tc_windup() calls,
and there is no other issues with parallel settime(). Remove spl()
vestiges there as well.

Tested by: pho (as part of the whole patch)
Reviewed by: jhb (same)
Discussed wit: bde
Sponsored by: The FreeBSD Foundation
MFC after: 1 month
Differential revision: https://reviews.freebsd.org/D7302

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Trace timeval parameters to the getitimer(2) and setitimer(2) syscalls.

Reviewed by: jhb
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.

Trace timeval parameters to the getitimer(2) and setitimer(2) syscalls.

Reviewed by: jhb
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D7158

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sys: extend use of the howmany() macro when available.

We have a howmany() macro in the <sys/param.h> header that is
convenient to re-use as it makes things easier to read.

MFH r289384-r293170

Sponsored by: The FreeBSD Foundation

Mfh r292839

Verify that tv_sec value specified in settimeofday() and clock_settime()
(CLOCK_REALTIME case) system calls is non negative.
This commit hides a kernel panic in atrtc_settime() as the clock_ts_to_ct(

Verify that tv_sec value specified in settimeofday() and clock_settime()
(CLOCK_REALTIME case) system calls is non negative.
This commit hides a kernel panic in atrtc_settime() as the clock_ts_to_ct()
does not properly convert negative tv_sec.

ps. in my opinion clock_ts_to_ct() should be rewritten to properly handle
negative tv_sec values.

Differential Revision: https://reviews.freebsd.org/D4714
Reviewed by: kib

MFC after: 1 week

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Merge sync of head

MFhead @ r277403

Reintegrate head: r274132-r277384

Sponsored by: The FreeBSD Foundation

Reintegrate head revisions r273096-r277147

Sponsored by: The FreeBSD Foundation

Fix an off by one in ppsratecheck(). If you asked for N=1 you'd get one,
but for any N>1 you'd get N-1 packets/events per second.

Allow clock_getcpuclockid() on the CPU-time clock for zombie process.
Posix does not prohibit this.

Differential Revision: https://reviews.freebsd.org/D1470

Reviewed by: kib
MFC after: 1 week

MFHead @ r275232

Merge ^/head r275118 through r275209.

The process spin lock currently has the following distinct uses:

- Threads lifetime cycle, in particular, counting of the threads in
the process, and interlocking with process mutex and thread loc

The process spin lock currently has the following distinct uses:

- Threads lifetime cycle, in particular, counting of the threads in
the process, and interlocking with process mutex and thread lock.
The main reason of this is that turnstile locks are after thread
locks, so you e.g. cannot unlock blockable mutex (think process
mutex) while owning thread lock.

- Virtual and profiling itimers, since the timers activation is done
from the clock interrupt context. Replace the p_slock by p_itimmtx
and PROC_ITIMLOCK().

- Profiling code (profil(2)), for similar reason. Replace the p_slock
by p_profmtx and PROC_PROFLOCK().

- Resource usage accounting. Need for the spinlock there is subtle,
my understanding is that spinlock blocks context switching for the
current thread, which prevents td_runtime and similar fields from
changing (updates are done at the mi_switch()). Replace the p_slock
by p_statmtx and PROC_STATLOCK().

The split is done mostly for code clarity, and should not affect
scalability.

Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 1 week

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Merge from head@274682

IFC @r269962

Submitted by: Anish Gupta (akgupt3@gmail.com)

Sync to HEAD@r269943.

Split up sys_ktimer_getoverrun() into a sys_ and a kern_ variant
and export the kern_ version needed by an upcoming linuxolator change.

MFC after: 3 days
Sponsored by: DARPA,AFRL

MFC @ r266724

An SVM update will follow this.

Merge head

IFC @264767