Commit Graph

148 Commits

Author SHA1 Message Date
Poul-Henning Kamp
b4b138c27f Including <sys/stdint.h> is (almost?) universally only to be able to use
%j in printfs, so put a newsted include in <sys/systm.h> where the printf
prototype lives and save everybody else the trouble.
2003-03-18 08:45:25 +00:00
Poul-Henning Kamp
60ca399653 Move timecounters notion of frequency to 64 bits.
[WARNING: CPUs in the distant future may be closer than they appear!]
2003-01-29 11:29:22 +00:00
Poul-Henning Kamp
4394f4767d Add sysctl kern.timecounter.nsetclock which indicates the number of
potential discontinuities in our UTC timescale.

Applications can monitor this variable if they want to be informed
about steps in the timescale.  Slews (ntp and adjtime(2)) and
frequency adjustments (ntp) will not increment this counter, only
operations which set the clock.  No attempt is made to classify
size or direction of the step.
2003-01-25 07:51:09 +00:00
Poul-Henning Kamp
ce9fac0072 Move a local variable to avoid the compiler warning about it being unused. 2003-01-16 20:06:45 +00:00
John Hay
b1e7e2019e hardpps() wants the raw hardware counter value converted to nanoseconds. 2003-01-16 19:22:13 +00:00
Peter Wemm
ff29255673 Explicitly have the timecounter init happen after the cpu_initclocks is
called.  Otherwise (depending on a non-deterministic sort), the timecounter
code can be initialized before the clock rate has been set (on ia64) and it
assumes hz = 100, rather than the real value of 1024.  I'm not sure how much
gets upset by this.

Glanced at by:	phk
2003-01-06 01:01:08 +00:00
Poul-Henning Kamp
b3ed130c42 Export tc_tick with sysctl, not tick.
Spotted by:	bde
2003-01-04 17:33:55 +00:00
Poul-Henning Kamp
38b0884cc3 Introduce a "time_uptime" global variable which holds the time since boot
in seconds.
2002-11-01 18:52:20 +00:00
Robert Drehmel
e80fb43467 Use strlcpy() instead of strncpy() to copy NUL terminated strings
for safety and consistency.
2002-10-17 20:03:38 +00:00
Poul-Henning Kamp
e46eeb89b9 Do not employ timecounter hardware if our hz does not support their
correct rewinding.
2002-09-04 19:32:18 +00:00
Poul-Henning Kamp
e7fa55af89 Give up on calling tc_ticktock() from a timeout, we have timeout
functions which run for several milliseconds at a time and getting
in queue behind one or more of those makes us miss our rewind.

Instead call it from hardclock() like we used to do, but retain the
prescaler so we still cope with high HZ values.
2002-09-04 10:15:19 +00:00
Mark Murray
4f8cb019ea Use a semicolon at the end of a function-like macro invocation. Kills
warnings and makes the visual style easier.
2002-07-15 13:13:04 +00:00
Kelly Yancey
e3f0c5755c Time counter stats are unsigned, advertise them to sysctl(8) that way.
PR:		(one small part of) 19720
Approved by:	phk
2002-06-11 19:47:44 +00:00
Poul-Henning Kamp
eef633a71f Mistyped and lost a '&' in previous commit. 2002-05-30 16:26:39 +00:00
Poul-Henning Kamp
fe71224650 Don't forget to factor in the boottime when we calculate PPS timestamps.
Submitted by:	Akira Watanabe <akira@myaw.ei.meisei-u.ac.jp>
2002-05-30 10:34:01 +00:00
Poul-Henning Kamp
48e5da550a Initialize time_second to 1 instead of zero to pacify slightly bogus arp code.
Various minor style fixes from BDE.
2002-05-03 08:46:03 +00:00
Peter Wemm
aed0556447 kern_tc.c doesn't use <machine/psl.h>, and having this #include breaks
other platforms.
2002-05-01 01:31:26 +00:00
Poul-Henning Kamp
39acc78a1e Brucifixion ? Yes, out that door, row on the left, one patch each.
Many thanks to:	bde
2002-04-30 20:42:06 +00:00
Poul-Henning Kamp
6b00cf46ec Stylistic sweep through the timecounter code.
Renovate comments.
2002-04-28 18:24:21 +00:00
Poul-Henning Kamp
d25917e856 Don't screw up our uptime with historical dates. 2002-04-28 16:51:36 +00:00
Poul-Henning Kamp
f5d157fb51 Explain magic number.
Add magic date no explanation.

Add a delta which was lost in transit yesterday which prevented
other timecounters from actually being used.
2002-04-27 07:28:54 +00:00
Poul-Henning Kamp
f175569ac2 Make the dummy timecounter actually tick or we will never get anyhere. 2002-04-27 07:06:52 +00:00
Poul-Henning Kamp
62efba6a0c Now that the private parts of timecounters are no longer being fingered
by other bits of code, split struct timecounter into two.

struct timecounter contains just the bits which pertains to the hardware
counter and the reading of it.

struct timehands (as in "the hands on a clock") contains all the ugly bit
fidling stuff.  Statically compile ten timehands.

This commit is the functional part.  A later cosmetic patch will rename
various variables and fieldnames.
2002-04-26 21:51:08 +00:00
Poul-Henning Kamp
b4a1d0deb1 Hide the private parts of timecounter from a couple of places that don't
really need to know the gory details.
2002-04-26 21:31:44 +00:00
Poul-Henning Kamp
7bf758bff0 Simplify the RFC2783 and PPS_SYNC timestamp collection API. 2002-04-26 20:24:28 +00:00
Poul-Henning Kamp
9e1b5510c3 Move the winding of timecounters out of hardclock and into a normal
timeout loop.

Limit the rate at which we wind the timecounters to approx 1000 Hz.

This limits the precision of the get{bin,nano,micro}[up]time(9)
functions to roughly a millisecond.
2002-04-26 12:37:36 +00:00
Poul-Henning Kamp
056abcabb7 Various cleanup and sorting of clock reading functions. Add the two
functions missing in the complete 12 function complement.
2002-04-26 10:19:29 +00:00
Poul-Henning Kamp
656d3e04d1 Rename tco_setscales() and tco_delta() to use the same tc_ prefix as
the rest of this file.
2002-04-26 10:11:02 +00:00
Poul-Henning Kamp
7e2d76ff05 Remove the tc_update() function. Any frequency change to the
timecounter will be used starting at the next second, which is
good enough for sysctl purposes.  If better adjustment is needed
the NTP PLL should be used.
2002-04-26 10:06:26 +00:00
Poul-Henning Kamp
e1d970f181 Improve the implementation of adjtime(2).
Apply the change as a continuous slew rather than as a series of
discrete steps and make it possible to adjust arbitraryly huge
amounts of time in either direction.

In practice this is done by hooking into the same once-per-second
loop as the NTP PLL and setting a suitable frequency offset deducting
the amount slewed from the remainder.  If the remaining delta is
larger than 1 second we slew at 5000PPM (5msec/sec), for a delta
less than a second we slew at 500PPM (500usec/sec) and for the last
one second period we will slew at whatever rate (less than 500PPM)
it takes to eliminate the delta entirely.

The old implementation stepped the clock a number of microseconds
every HZ to acheive the same effect, using the same rates of change.

Eliminate the global variables tickadj, tickdelta and timedelta and
their various use and initializations.

This removes the most significant obstacle to running timecounter and
NTP housekeeping from a timeout rather than hardclock.
2002-04-15 12:23:11 +00:00
Poul-Henning Kamp
45609bea17 Get the magnitude of the NTP adjustment right. 2002-03-28 16:02:44 +00:00
Alfred Perlstein
4d77a549fe Remove __P. 2002-03-19 21:25:46 +00:00
Poul-Henning Kamp
1634e90817 Remove unused variable. 2002-02-26 09:16:27 +00:00
Poul-Henning Kamp
5b7d8efa8d Add a generation number to timecounters and spin if it changes under
our feet when we look inside timecounter structures.

Make the "sync_other" code more robust by never overwriting the
tc_next field.

Add counters for the bin[up]time functions.

Call tc_windup() in tc_init() and switch_timecounter() to make sure
we all the fields set right.
2002-02-24 20:04:07 +00:00
Poul-Henning Kamp
4e2befc031 Use better scaling factor for NTPs correction.
Explain the magic.
2002-02-22 12:59:20 +00:00
Poul-Henning Kamp
2028c0cdb9 Revise timercounters to use binary fixed point format internally.
The binary format "bintime" is a 32.64 format, it will go to 64.64
when time_t does.

The bintime format is available to consumers of time in the kernel,
and is preferable where timeintervals needs to be accumulated.

This change simplifies much of the magic math inside the timecounters
and improves the frequency and time precision by a couple of bits.

I have not been able to measure a performance difference which was not
a tiny fraction of the standard deviation on the measurements.
2002-02-07 21:21:55 +00:00
Poul-Henning Kamp
a305896436 Let the number of timecounters follow hz, otherwise people with
HZ=BIGNUM will strain the assumptions behind timecounters to the
point where they break.

This may or may not help people seeing microuptime() backwards messages.

Make the global timecounter variable volatile, it makes no difference in
the code GCC generates, but it makes represents the intent correctly.

Thanks to:	jdp
MFC after:	2 weeks
2002-02-05 20:44:56 +00:00
Poul-Henning Kamp
05a2f79888 Be more conservative about interrupt latency, it aint getting better it seems. 2002-01-25 21:22:34 +00:00
Poul-Henning Kamp
8eb6e436e8 Remove a bogus #ifdef KTR stanza.
Noticed by:	Alexander Langer <alex@big.endian.de>
2001-01-01 23:09:53 +00:00
Jason Evans
0384fff8c5 Major update to the way synchronization is done in the kernel. Highlights
include:

* Mutual exclusion is used instead of spl*().  See mutex(9).  (Note: The
  alpha port is still in transition and currently uses both.)

* Per-CPU idle processes.

* Interrupts are run in their own separate kernel threads and can be
  preempted (i386 only).

Partially contributed by:	BSDi (BSD/OS)
Submissions by (at least):	cp, dfr, dillon, grog, jake, jhb, sheldonh
2000-09-07 01:33:02 +00:00
Poul-Henning Kamp
77978ab8bc Previous commit changing SYSCTL_HANDLER_ARGS violated KNF.
Pointed out by:	bde
2000-07-04 11:25:35 +00:00
Poul-Henning Kamp
82d9ae4e32 Style police catches up with rev 1.26 of src/sys/sys/sysctl.h:
Sanitize SYSCTL_HANDLER_ARGS so that simplistic tools can grog our
sources:

        -sysctl_vm_zone SYSCTL_HANDLER_ARGS
        +sysctl_vm_zone (SYSCTL_HANDLER_ARGS)
2000-07-03 09:35:31 +00:00
Poul-Henning Kamp
91266b96c4 Isolate the Timecounter internals in their own two files.
Make the public interface more systematically named.

Remove the alternate method, it doesn't do any good, only ruins performance.

Add counters to profile the usage of the 8 access functions.

Apply the beer-ware to my code.

The weird +/- counts are caused by two repocopies behind the scenes:
	kern/kern_clock.c -> kern/kern_tc.c
	sys/time.h -> sys/timetc.h
(thanks peter!)
2000-03-20 14:09:06 +00:00
Poul-Henning Kamp
f1220da49c Fix sign reversal in adjtime(2).
Approved by:	jkh
2000-02-13 10:56:32 +00:00
Poul-Henning Kamp
2ac0d0a1f7 Make adjtime(2) adjust boottime so it doesn't cause non-monotonous
uptime.
1999-12-08 10:02:12 +00:00
Bruce Evans
71a62f8a05 Fixed some comments in statclock(). The previous commit made it clearer
that one comment was attached to null code.
1999-11-27 14:37:34 +00:00
Bruce Evans
8a9d4d98b1 Moved scheduling-related code to kern_synch.c so that it is easier to fix
and extend.  The new function containing the code is named schedclock()
as in NetBSD, but it has slightly different semantics (it already handles
incrementation of p->p_cpticks, and it should handle any calling frequency).

Agreed with in principle by:	dufault
1999-11-27 12:32:27 +00:00
Peter Wemm
de3f888991 #ifdef PPS_SYNC around "kapi" declaration to fix a -Wunused warning. 1999-10-10 16:18:36 +00:00
John Hay
b7424f2dfb Update the PPSAPI to draft-mogul-pps-api-05.txt which is the latest.
NOTE: This will break building ntpd until ntpd has been upgraded to also
support draft 05. People that want to build ntpd in the meantime can
get patches from me.
1999-10-09 14:49:56 +00:00
Bruce Evans
37d3877723 Moved the definition of `boottime' and its sysctl to the correct file. 1999-09-13 14:22:27 +00:00