per-process itimers: itimerval -> itimerspec

Loongson runs at 128hz. 128 doesn't divide evenly into a million,
but it does divide evenly into a billion. So if we do the per-process
itimer bookkeep

per-process itimers: itimerval -> itimerspec

Loongson runs at 128hz. 128 doesn't divide evenly into a million,
but it does divide evenly into a billion. So if we do the per-process
itimer bookkeeping with itimerspec structs we can have error-free
virtual itimers on loongson just as we do on most other platforms.

This change doesn't fix the virtual itimer error alpha, as 1024 does not
divide evenly into a billion. But this doesn't make the situation any
worse, either.

ok deraadt@

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Simplify by using `spc' since we already have it, no behavior change.

Only the scheduler time statistics should be affected by spinning.
Change the process time accounting back to the original code before
spinning time was added. No change for scheduler time. Spinnin

Only the scheduler time statistics should be affected by spinning.
Change the process time accounting back to the original code before
spinning time was added. No change for scheduler time. Spinning
interrupts are no longer accounted to process system time.
input and OK visa@

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User land time accounting has changed when kernel spinning time was
introduced. Account spinning time to the process system time again.
time(1) has no spinning, it only shows real, user, sys.
OK vis

User land time accounting has changed when kernel spinning time was
introduced. Account spinning time to the process system time again.
time(1) has no spinning, it only shows real, user, sys.
OK visa@ mpi@ deraadt@

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drop BUMPTIME

unused since v1.76, ca 5.3

ok kettenis@ deraadt@

Stopping counting and reporting CPU time spent spinning on a lock as
system time.

Introduce a new CP_SPIN "scheduler state" and modify userland tools
to display the % of timer a CPU spents spinning.

Stopping counting and reporting CPU time spent spinning on a lock as
system time.

Introduce a new CP_SPIN "scheduler state" and modify userland tools
to display the % of timer a CPU spents spinning.

Based on a diff from jmatthew@, ok pirofti@, bluhm@, visa@, deraadt@

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Introduce jiffies, a volatile unsigned long version of our ticks variable
for use by the linux compatibility APIs in drm(4).

While I hate infecting code in sys/kern with this, untangling all the
of

Introduce jiffies, a volatile unsigned long version of our ticks variable
for use by the linux compatibility APIs in drm(4).

While I hate infecting code in sys/kern with this, untangling all the
of having different types and different signedness is too much for me
right now. The best strategy may be to change ticks itself to be long
but that needs some careful auditing.

ok deraadt@

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clear structure on the stack before copying out for sysctl. At present
it has no pads, but a future ABI change could add something and leak
kernel memory.

Introduce Dynamic Profiling, a ddb(4) based & gprof compatible kernel
profiling framework.

Code patching is used to enable probes when entering functions. The
probes will call a mcount()-like funct

Introduce Dynamic Profiling, a ddb(4) based & gprof compatible kernel
profiling framework.

Code patching is used to enable probes when entering functions. The
probes will call a mcount()-like function to match the behavior of a
GPROF kernel.

Currently only available on amd64 and guarded under DDBPROF. Support
for other archs will follow soon.

A new sysctl knob, ddb.console, need to be set to 1 in securelevel 0
to be able to use this feature.

Inputs and ok guenther@

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set ticks 15 seconds before its value wraps.

this helps us identify issues around ticks wrap in 15 minutes instead
of 240ish days. the change is inspired by something freebsd did as
a result of a ti

set ticks 15 seconds before its value wraps.

this helps us identify issues around ticks wrap in 15 minutes instead
of 240ish days. the change is inspired by something freebsd did as
a result of a ticks change they made that went horribly wrong.

lots of people said they wanted this

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Update ticks in hardclock().

OK mikeb@

Move hzto(9) to the attic; OK dlg

Remove non-standard <sys/dkstat.h> header. It has not contained anything
related to disk stastics for almost 17 years, and the remaining
userland-visible defines duplicate those found in <sys/sched.h

Remove non-standard <sys/dkstat.h> header. It has not contained anything
related to disk stastics for almost 17 years, and the remaining
userland-visible defines duplicate those found in <sys/sched.h>.

Move the remaining _KERNEL defines to <sys/tty.h> where they belong, and
update all users to cope with this.

ok kettenis@

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Remove global cp_time[] array; no longer used now that all arches implement
cpu_info.

decouple struct uvmexp into a new file, so that uvm_extern.h and sysctl.h
don't need to be married.
ok guenther miod beck jsing kettenis

rename local ticks to nticks to avoid aliasing global. ok krw

Fix delivery of SIGPROF and SIGVTALRM to threaded processes by having
hardclock() set a flag on the running thread and force AST processing,
and then have the thread signal itself from userret().

id

Fix delivery of SIGPROF and SIGVTALRM to threaded processes by having
hardclock() set a flag on the running thread and force AST processing,
and then have the thread signal itself from userret().

idea and flag names from FreeBSD
ok jsing@

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Switch time_t, ino_t, clock_t, and struct kevent's ident and data
members to 64bit types. Assign new syscall numbers for (almost
all) the syscalls that involve the affected types, including anything

Switch time_t, ino_t, clock_t, and struct kevent's ident and data
members to 64bit types. Assign new syscall numbers for (almost
all) the syscalls that involve the affected types, including anything
with time_t, timeval, itimerval, timespec, rusage, dirent, stat,
or kevent arguments. Add a d_off member to struct dirent and replace
getdirentries() with getdents(), thus immensely simplifying and
accelerating telldir/seekdir. Build perl with -DBIG_TIME.

Bump the major on every single base library: the compat bits included
here are only good enough to make the transition; the T32 compat
option will be burned as soon as we've reached the new world are
are happy with the snapshots for all architectures.

DANGER: ABI incompatibility. Updating to this kernel requires extra
work or you won't be able to login: install a snapshot instead.

Much assistance in fixing userland issues from deraadt@ and tedu@
and build assistance from todd@ and otto@

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Add tstohz(9) as the timespec analog to tvtohz(9).

ok miod

do not include machine/cpu.h from a .c file; it is the responsibility of
.h files to pull it in, if needed
ok tedu

Fix kernel profiling on MP systems by using per-CPU buffers and teach
kgmon(8) to deal with them, this time without public header changes.

Previously various CPUs were iterating over the same global

Fix kernel profiling on MP systems by using per-CPU buffers and teach
kgmon(8) to deal with them, this time without public header changes.

Previously various CPUs were iterating over the same global buffer at
the same time to modify it and never ended.

This diff includes some ideas submited by Thor Simon to NetBSD via miod@.

ok deraadt@, mikeb@, haesbaert@

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Back out per-CPU kernel profiling, it shouldn't modify a public header
at this moment.

Fix kernel profiling on MP systems by using per-CPU buffer. Previously
various CPUs were iterating over the same global buffer at the same
time to modify it and never ended.

This diff includes some

Fix kernel profiling on MP systems by using per-CPU buffer. Previously
various CPUs were iterating over the same global buffer at the same
time to modify it and never ended.

This diff includes some ideas submited by Thor Simon to NetBSD via miod@.

ok mikeb@, haesbaert@

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unifdef -D __HAVE_TIMECOUNTER

Apply profiling to all threads instead of just the thread that called
profil() by moving P_PROFIL from proc->p_flag to process->ps_flags with
matching adjustment in fork1() and exit1()

ok matthew@