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* Various cleanup and sorting of clock reading functions. Add the twophk2002-04-261-71/+79
| | | | functions missing in the complete 12 function complement.
* Rename tco_setscales() and tco_delta() to use the same tc_ prefix asphk2002-04-261-11/+8
| | | | the rest of this file.
* Remove the tc_update() function. Any frequency change to thephk2002-04-261-6/+0
| | | | | | 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.
* Improve the implementation of adjtime(2).phk2002-04-151-19/+4
| | | | | | | | | | | | | | | | | | | | | | | 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.
* Get the magnitude of the NTP adjustment right.phk2002-03-281-3/+4
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* Remove __P.alfred2002-03-191-2/+2
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* Remove unused variable.phk2002-02-261-1/+0
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* Add a generation number to timecounters and spin if it changes underphk2002-02-241-37/+62
| | | | | | | | | | | | 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.
* Use better scaling factor for NTPs correction.phk2002-02-221-1/+7
| | | | Explain the magic.
* Revise timercounters to use binary fixed point format internally.phk2002-02-071-108/+60
| | | | | | | | | | | | | | 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.
* Let the number of timecounters follow hz, otherwise people withphk2002-02-051-2/+3
| | | | | | | | | | | | | 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
* Be more conservative about interrupt latency, it aint getting better it seems.phk2002-01-251-2/+2
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* Remove a bogus #ifdef KTR stanza.phk2001-01-011-7/+0
| | | | Noticed by: Alexander Langer <alex@big.endian.de>
* Major update to the way synchronization is done in the kernel. Highlightsjasone2000-09-071-1/+8
| | | | | | | | | | | | | | | 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
* Previous commit changing SYSCTL_HANDLER_ARGS violated KNF.phk2000-07-041-1/+1
| | | | Pointed out by: bde
* Style police catches up with rev 1.26 of src/sys/sys/sysctl.h:phk2000-07-031-1/+1
| | | | | | | | Sanitize SYSCTL_HANDLER_ARGS so that simplistic tools can grog our sources: -sysctl_vm_zone SYSCTL_HANDLER_ARGS +sysctl_vm_zone (SYSCTL_HANDLER_ARGS)
* Isolate the Timecounter internals in their own two files.phk2000-03-201-477/+54
| | | | | | | | | | | | | | | 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!)
* Fix sign reversal in adjtime(2).phk2000-02-131-1/+1
| | | | Approved by: jkh
* Make adjtime(2) adjust boottime so it doesn't cause non-monotonousphk1999-12-081-2/+11
| | | | uptime.
* Fixed some comments in statclock(). The previous commit made it clearerbde1999-11-271-8/+8
| | | | that one comment was attached to null code.
* Moved scheduling-related code to kern_synch.c so that it is easier to fixbde1999-11-271-21/+1
| | | | | | | | 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
* #ifdef PPS_SYNC around "kapi" declaration to fix a -Wunused warning.peter1999-10-101-0/+2
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* Update the PPSAPI to draft-mogul-pps-api-05.txt which is the latest.jhay1999-10-091-42/+54
| | | | | | 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.
* Moved the definition of `boottime' and its sysctl to the correct file.bde1999-09-131-0/+4
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* $Id$ -> $FreeBSD$peter1999-08-281-1/+1
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* Oops, the previous commit only worked in the one case it was tested for.bde1999-07-241-2/+3
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* Added a sysctl "kern.timecounter.hardware" for selecting the hardwarebde1999-07-181-6/+41
| | | | | | | | | used for timecounting. The possible values are the names of the physically present harware timecounters ("i8254" and "TSC" on i386's). Fixed some nearby bitrot in comments in <sys/time.h>. Reviewed by: phk
* Remove four no-op casts.jdp1999-07-181-5/+5
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* Make the machdep.i8254_freq and machdep.tsc_freq sysctls modify thephk1999-04-251-3/+9
| | | | | | timecounter as well Asked for by: bde, jhay
* Don't open window for race condition.phk1999-04-021-4/+1
| | | | Detected by: Reg Clemens <reg@dwf.com>
* Fix an old cut&paste bogon.phk1999-03-121-2/+2
| | | | Noticed by: bde
* Remove duplicate include.phk1999-03-121-4/+1
| | | | Noticed by: bde
* Make even more of the PPSAPI implementations generic.phk1999-03-111-52/+147
| | | | | | | | FLL support in hardpps() Various magic shuffles and improved comments Style fixes from Bruce.
* Integrate the new "nanokernel" PLL from Dave Mills.phk1999-03-081-5/+2
| | | | | | | This code is backwards compatible with the older "microkernel" PLL, but allows ntpd v4 to use nanosecond resolution. Many other improvements. PPS_SYNC and hardpps() are NOT supported yet.
* Introduce machine-dependent macro pgtok() to convert page count to numberluoqi1999-02-191-5/+5
| | | | | of kilobytes. Its definition for each architecture could be optimized to avoid potential numerical overflows.
* Hide access to vmspace:vm_pmap with inline function vmspace_pmap(). Thisluoqi1999-02-191-3/+2
| | | | | | | is the preparation step for moving pmap storage out of vmspace proper. Reviewed by: Alan Cox <alc@cs.rice.edu> Matthew Dillion <dillon@apollo.backplane.com>
* Make the previous behaviour the default, add a sysctl which youphk1998-11-291-12/+42
| | | | | | | | | | | | | | can set if your hw/sw produces the "calcru negative..." message. Setting the alternate method (sysctl -w kern.timecounter.method=1) makes the the get{nano|micro}*() functions call the real thing at resulting in a measurable but minor overhead. I decided to NOT have the "calcru" change the method automatically because you should be aware of this problem if you have it. The problems currently seen, related to usleep and a few other corners are fixed for both methods.
* Make timecounters more resistant to badly behaved SW/HW which locksphk1998-11-231-10/+18
| | | | | | | | | | | out interrupts for too long. If you still see the "calcru: negative time..." message you can increase NTIMECOUNTER (see LINT). Sideeffect is that a timecounter is required to not wrap around in less than (1 + delta) seconds instead of the (1/hz + delta) required until now. Many thanks to: msmith, wpaul, wosch & bde
* Add a kludge to prevent panicing when using VM86 and hitting heresos1998-11-231-2/+2
| | | | | | with a NULL curproc. Originally by: Tor Egge (IIRC)
* Fixed breakage of the GPROF case of statclock() in the previous commit.bde1998-10-261-1/+2
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* Nitpicking and dusting performed on a train. Removes trivial warningsphk1998-10-251-3/+2
| | | | about unused variables, labels and other lint.
* Change the way we simulate stable storage for timecounters.phk1998-10-231-57/+52
| | | | | | If you have problems with the "calcru" messages and processes being killed for excessive cpu time, try to increase the NTIMECOUNTER #define and report your findings.
* Cast the return value of tvtohz() from a long to an int to satisfy thealex1998-10-061-2/+2
| | | | | | | compiler that we know what we're doing (the value returned has already been restricted to int ranges). Reviewed by: bde
* kern_clock.c:gibbs1998-09-151-18/+2
| | | | | | | Remove old disk statistics variables. vfs_bio.c: Enable bowrite now that B_ORDERED works for all buffer devices.
* Removed unused function hzto().bde1998-08-051-18/+1
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* Fixed printf format errors.bde1998-07-111-2/+2
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* Hmm, braino in last commit.phk1998-07-041-4/+5
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* Change the sign on a race-condition, so that instead of ending up severalphk1998-07-041-8/+18
| | | | | tens of milliseconds out in the future we end up the right place with a subweeniesecond error.
* When we transfer time from one timecounter to the next, use nanouptime(),phk1998-07-021-4/+4
| | | | | | not nanotime(); Otherwise we end up in 2026... Fix the arg to dummy_get_timecount()
* Add a tc_ prefix to struct timecounter members.phk1998-06-091-88/+92
| | | | Urged by: bde
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