Commit Graph

56 Commits

Author SHA1 Message Date
marks
2edc978740 Place function comment above the right function. 2004-11-19 00:58:30 +00:00
marks
d0ae6351d9 Add system call implementation of ntp_gettime(2).
Moved most of the work to ntp_gettime1(), which is now called by
ntp_gettime() and ntp_sysctl().

Reviewed by:	imp, phk, njl, peter
Approved by:	njl
2004-11-18 23:44:49 +00:00
phk
7a8abdd585 Annual NTP kernel code spring-cleaning:
Use int64_t rather than long long for the fixpoint type.

Don't discard fractional nanosecond frequency correction.
2004-03-14 15:23:05 +00:00
phk
81a3e3bfb9 Deal with MOD_FREQUENCY before MOD_OFFSET because the latter is the
one which runs the actual update.  This fixes a bug where there were
a delay in applying the frequency adjustment.  In extreme cases this
could result in marginal stability of the kernel-pll.
2004-01-24 21:48:43 +00:00
imp
27d211ac0c During a positive leap second, the tai_time offset should be
incremented at the start of the leap second, not after the leap second
has been inserted.  This is because at the start of the leap second,
we set the time back one second.  This setting back one second is the
moment that the offset changes.  The old code set it back after the
leap second, but that's one second too late.  The negative leap second
case is handled correctly.

Reviewed by: phk
2003-06-25 20:56:40 +00:00
obrien
3b8fff9e4c Use __FBSDID(). 2003-06-11 00:56:59 +00:00
peter
af85e6b2d6 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
phk
ae4ae707ad Remove an unused variable. 2002-10-11 10:36:22 +00:00
phk
d1d55e6cb9 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
phk
f4a2041f29 suser is Giant safe, so optimize a pointless case. 2002-04-19 09:20:13 +00:00
phk
2edc95ffee Remove two debug printfs which should never have been committed. 2002-04-15 21:08:51 +00:00
jhb
f656d44b0b You have to cast int64_t's to long long if you printf them with %lld.
This now compiles on alpha without a warning.

Pointy-hat to:	phk
2002-04-15 21:04:32 +00:00
phk
b6bf4c07cf 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
phk
af54e26ee0 In the ntp_adjtime(2) syscall, return our actual estimate of unapplied
offset correction instead of the most recent offset applied.
2002-04-15 08:58:24 +00:00
jhb
dc2e474f79 Change the suser() API to take advantage of td_ucred as well as do a
general cleanup of the API.  The entire API now consists of two functions
similar to the pre-KSE API.  The suser() function takes a thread pointer
as its only argument.  The td_ucred member of this thread must be valid
so the only valid thread pointers are curthread and a few kernel threads
such as thread0.  The suser_cred() function takes a pointer to a struct
ucred as its first argument and an integer flag as its second argument.
The flag is currently only used for the PRISON_ROOT flag.

Discussed on:	smp@
2002-04-01 21:31:13 +00:00
phk
a028cfa65d 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
julian
5596676e6c KSE Milestone 2
Note ALL MODULES MUST BE RECOMPILED
make the kernel aware that there are smaller units of scheduling than the
process. (but only allow one thread per process at this time).
This is functionally equivalent to teh previousl -current except
that there is a thread associated with each process.

Sorry john! (your next MFC will be a doosie!)

Reviewed by: peter@freebsd.org, dillon@freebsd.org

X-MFC after:    ha ha ha ha
2001-09-12 08:38:13 +00:00
dillon
b781e73eb6 Pushdown Giant for: profil(), ntp_adjtime(), ogethostname(),
osethostname(), ogethostid(), osethostid()
2001-09-01 05:47:58 +00:00
jhay
0bd9e525aa Update to the 2001-04-02 version of the nanokernel code from Dave Mills. 2001-04-16 13:05:05 +00:00
phk
06ca4c9ec0 Updates to the ntp pll from John Hay.
Submitted by:	jhay
2000-09-10 09:13:34 +00:00
phk
a6dc2ae9af Update the NTP kernel PLL code to the 2000-08-29 version of Dave Mills
nanokernel.

The FreeBSD private mode hardpps Type 2 PLL has been removed.
2000-09-04 08:19:32 +00:00
phk
e5de271d47 Previous commit changing SYSCTL_HANDLER_ARGS violated KNF.
Pointed out by:	bde
2000-07-04 11:25:35 +00:00
phk
61ff05be25 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
phk
1a34cea0e8 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
phk
56d1c048ef Add a couple of strategic sysctls for monitoring.
In the rather obscure case of hardpps(), use a type-II PLL if the external
signal is phase locked, but a FLL if it isn't.
2000-01-23 14:52:37 +00:00
phk
325c58929a Create a separate pps_offset variable to use for applying the
hardpps() produced offset component.  This is tested and behaved
stable with frequency offsets from -338.05 to +499.91 PPM.

Interestingly the machine I tested this on would fail if the clock
were slower than 14.3132 MHz whereas it was perfectly happy to run
at 16.384 MHz, in other words [-340PPM ... +14.4%]

Make pps_shift tweakable with sysctl.
2000-01-04 12:04:39 +00:00
phk
c5dd6ef219 Don't use time_offset as a leaky bucket variable in hardpps(), this
resulted in vastly optimistic offset values reported to userland
(typically a factor 40+ too small).  Apart from that, the code had
two sign-bugs.

Apply the hardpps() phase with the right sign with a simply
scaling by integration interval.  (This may be too stiff at
long integration intervals, see below).

Allow pps_shiftmax to be reduced again.

Before this, the phase lock in hardpps() were broken, but due to
two bugs mostly cancelling out, it would end up basically working
with a large stochastic component.  Now it behaves as one would
expect: smooth and quiet.

It seems that pps_shiftmax above 7..9 somewhere makes the phaselock
too weak to hold onto random walk phase errors from a HP-105 OCXO,
which basically means that it is too weak for real-life use with
such integration times.  This is yet to be resolved.

Submitted to:	Prof. Dave "NTP" Mills.
Tested by:	Terje Mathisen <Terje.Mathisen@hda.hydro.com>
1999-12-29 14:39:24 +00:00
phk
dc1e390721 pps_shiftmax only exists #ifdef PPS_SYNC
Found by:	Roger Hardiman <roger@cs.strath.ac.uk>
1999-08-30 16:21:32 +00:00
phk
50c0eae18d Update to the latest nanokernel from Dave Mills. 1999-08-30 12:04:49 +00:00
phk
16e3fbd2c1 Suser() simplification:
1:
  s/suser/suser_xxx/

2:
  Add new function: suser(struct proc *), prototyped in <sys/proc.h>.

3:
  s/suser_xxx(\([a-zA-Z0-9_]*\)->p_ucred, \&\1->p_acflag)/suser(\1)/

The remaining suser_xxx() calls will be scrutinized and dealt with
later.

There may be some unneeded #include <sys/cred.h>, but they are left
as an exercise for Bruce.

More changes to the suser() API will come along with the "jail" code.
1999-04-27 11:18:52 +00:00
phk
95a470c499 Fix a division which I had made a multiplication.
Fix return value from ntp_adjtime().

Submitted by:	jhay
1999-04-04 19:56:04 +00:00
phk
ec237a8695 Dang, lost some LL's there. 1999-04-04 10:53:59 +00:00
phk
c675a22738 Update to latest version from Dave Mills. Mostly textual. 1999-04-04 10:28:42 +00:00
phk
fbf7e67973 Make the same size rounding error both ways. 1999-03-22 14:01:58 +00:00
phk
b99d0abd0f Don't run FLL fodder through the median-filter.
Reduce max integration time to 128sec and use 50% exponential decay rather
than 256sec/25%.
1999-03-16 08:39:37 +00:00
phk
494908a571 Allow !suser() R/O access to ntp_adjtime()
Noticed by: Reg Clemens <reg@dwf.com>
1999-03-15 08:35:40 +00:00
phk
1542a4a497 Make even more of the PPSAPI implementations generic.
FLL support in hardpps()

Various magic shuffles and improved comments

Style fixes from Bruce.
1999-03-11 15:09:51 +00:00
phk
6451714151 Integrate the new "nanokernel" PLL from Dave Mills.
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.
1999-03-08 12:36:14 +00:00
phk
885f9e9d51 Introduce std_pps_ioctl() to automagically DTRT.
Add scaling capability to timex.offset, ntpd-4.0.73 will support this.
1998-06-13 09:30:26 +00:00
phk
3c3eaf50d5 Add a tc_ prefix to struct timecounter members.
Urged by:	bde
1998-06-09 13:10:54 +00:00
phk
9b703b1455 Eradicate the variable "time" from the kernel, using various measures.
"time" wasn't a atomic variable, so splfoo() protection were needed
around any access to it, unless you just wanted the seconds part.

Most uses of time.tv_sec now uses the new variable time_second instead.

gettime() changed to getmicrotime(0.

Remove a couple of unneeded splfoo() protections, the new getmicrotime()
is atomic, (until Bruce sets a breakpoint in it).

A couple of places needed random data, so use read_random() instead
of mucking about with time which isn't random.

Add a new nfs_curusec() function.

Mark a couple of bogosities involving the now disappeard time variable.

Update ffs_update() to avoid the weird "== &time" checks, by fixing the
one remaining call that passwd &time as args.

Change profiling in ncr.c to use ticks instead of time.  Resolution is
the same.

Add new function "tvtohz()" to avoid the bogus "splfoo(), add time, call
hzto() which subtracts time" sequences.

Reviewed by:	bde
1998-03-30 09:56:58 +00:00
phk
044e1e6296 Replace TOD clock code with more systematic approach.
Highlights:
    * Simple model for underlying hardware.
    * Hardware basis for timekeeping can be changed on the fly.
    * Only one hardware clock responsible for TOD keeping.
    * Provides a real nanotime() function.
    * Time granularity: .232E-18 seconds.
    * Frequency granularity:  .238E-12 s/s
    * Frequency adjustment is continuous in time.
    * Less overhead for frequency adjustment.
    * Improves xntpd performance.

Reviewed by:    bde, bde, bde
1998-02-20 16:36:17 +00:00
phk
9b84234e63 unifdef -UEXT_CLOCK fdef -UEXT_CLOCK, it is irrelevant.
Fix a couple of nits from bde while here anyway.
1998-02-15 13:50:12 +00:00
eivind
e8dbec0c06 Make POWERFAIL_NMI, PPS_SYNC and NATM new style options.
This also fixes a couple of defunct options; submitted by bde.
1998-01-31 05:00:21 +00:00
phk
74b3033fff Move almost all the ntp related stuff from kern_clock.c to
kern_ntptime.c.  The only bit left over is that which is executed
in all calls to hardclock().  Various cleanups and staticizing
along the road.
1998-01-14 20:48:16 +00:00
phk
4c8218a5c7 Move the "retval" (3rd) parameter from all syscall functions and put
it in struct proc instead.

This fixes a boatload of compiler warning, and removes a lot of cruft
from the sources.

I have not removed the /*ARGSUSED*/, they will require some looking at.

libkvm, ps and other userland struct proc frobbing programs will need
recompiled.
1997-11-06 19:29:57 +00:00
jhay
b3234516f1 Update our kernel ntp code to the latest from David Mills. The main change
is the addition of the FLL code, which is used by the latest versions of
xntpd. The kernel PPS code is also updated, although I can't test that yet.
1996-12-30 18:26:28 +00:00
bde
63875293f2 Removed unnecessary #includes of vm stuff. Most of them were once
prerequisites for <sys/sysctl.h>.

subr_prof.c:
Also replaced #include of <sys/user.h> by #include of <sys/resourcevar.h>.
1995-12-06 23:37:44 +00:00
phk
6b7609f909 A major sweep over the sysctl stuff.
Move a lot of variables home to their own code (In good time before xmas :-)

Introduce the string descrition of format.

Add a couple more functions to poke into these marvels, while I try to
decide what the correct interface should look like.

Next is adding vars on the fly, and sysctl looking at them too.

Removed a tine bit of defunct and #ifdefed notused code in swapgeneric.
1995-12-04 16:48:58 +00:00
phk
08ab771c4d Move KERN_NTP to a more suitable file. 1995-11-14 09:07:14 +00:00