Commit Graph

41 Commits

Author SHA1 Message Date
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
Julian Elischer
b40ce4165d 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
Matthew Dillon
6f1e8c186f Pushdown Giant for: profil(), ntp_adjtime(), ogethostname(),
osethostname(), ogethostid(), osethostid()
2001-09-01 05:47:58 +00:00
John Hay
24dbea46a9 Update to the 2001-04-02 version of the nanokernel code from Dave Mills. 2001-04-16 13:05:05 +00:00
Poul-Henning Kamp
8925e63cd3 Updates to the ntp pll from John Hay.
Submitted by:	jhay
2000-09-10 09:13:34 +00:00
Poul-Henning Kamp
97804a5c99 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
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
7fd299cb92 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
Poul-Henning Kamp
6a77f60d4a 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
Poul-Henning Kamp
19c5221906 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
Poul-Henning Kamp
5968e18b69 pps_shiftmax only exists #ifdef PPS_SYNC
Found by:	Roger Hardiman <roger@cs.strath.ac.uk>
1999-08-30 16:21:32 +00:00
Poul-Henning Kamp
82e84c5bd2 Update to the latest nanokernel from Dave Mills. 1999-08-30 12:04:49 +00:00
Poul-Henning Kamp
f711d546d2 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
Poul-Henning Kamp
a508801763 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
Poul-Henning Kamp
34cffbe3f6 Dang, lost some LL's there. 1999-04-04 10:53:59 +00:00
Poul-Henning Kamp
f425c1f631 Update to latest version from Dave Mills. Mostly textual. 1999-04-04 10:28:42 +00:00
Poul-Henning Kamp
3a25914cfd Make the same size rounding error both ways. 1999-03-22 14:01:58 +00:00
Poul-Henning Kamp
884ab557d9 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
Poul-Henning Kamp
fafbe352c0 Allow !suser() R/O access to ntp_adjtime()
Noticed by: Reg Clemens <reg@dwf.com>
1999-03-15 08:35:40 +00:00
Poul-Henning Kamp
32c203577a 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
Poul-Henning Kamp
c68996e271 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
Poul-Henning Kamp
938ee3ce4d 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
Poul-Henning Kamp
a58f0f8e66 Add a tc_ prefix to struct timecounter members.
Urged by:	bde
1998-06-09 13:10:54 +00:00
Poul-Henning Kamp
227ee8a188 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
Poul-Henning Kamp
7ec73f6417 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
Poul-Henning Kamp
9ada5a50f3 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 Eklund
e0d781f3a5 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
Poul-Henning Kamp
6f70df1587 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
Poul-Henning Kamp
cb226aaa62 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
John Hay
885bd8e459 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
Bruce Evans
2baeef32b6 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
Poul-Henning Kamp
946bb7a268 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
Poul-Henning Kamp
a52752a457 Move KERN_NTP to a more suitable file. 1995-11-14 09:07:14 +00:00
Bruce Evans
d2d3e8751c Included <sys/sysproto.h> to get central declarations for syscall args
structs and prototypes for syscalls.

Ifdefed duplicated decentralized declarations of args structs.  It's
convenient to have this visible but they are hard to maintain.  Some
are already different from the central declarations.  4.4lite2 puts
them in comments in the function headers but I wanted to avoid the
large changes for that.
1995-11-12 06:43:28 +00:00
Rodney W. Grimes
9b2e535452 Remove trailing whitespace. 1995-05-30 08:16:23 +00:00
Andrey A. Chernov
1e35c6c787 Add vm/vm.h for complete sysctl type.
Remove wrong time declaration, already have correct in kernel.h
(kern_ntptime not compiled without this changes)
1994-09-19 17:39:21 +00:00
Doug Rabson
834d25cdf1 Reversed last revision which was a mistake. 1994-09-19 15:49:46 +00:00
Doug Rabson
27a0bc89a4 Added msdosfs.
Obtained from: NetBSD
1994-09-19 15:41:57 +00:00
Garrett Wollman
3f31c649d1 Redo Kernel NTP PLL support, kernel side.
This code is mostly taken from the 1.1 port (which was in turn taken from
Dave Mills's kern.tar.Z example).  A few significant differences:

1) ntp_gettime() is now a MIB variable rather than a system call.  A few
fiddles are done in libc to make it behave the same.

2) mono_time does not participate in the PLL adjustments.

3) A new interface has been defined (in <machine/clock.h>) for doing
possibly machine-dependent things around the time of the clock update.
This is used in Pentium kernels to disable interrupts, set `time', and
reset the CPU cycle counter as quickly as possible to avoid jitter in
microtime().  Measurements show an apparent resolution of a bit more than
8.14usec, which is reasonable given system-call overhead.
1994-09-18 20:40:01 +00:00