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* Diff from art@:grange2004-11-101-2/+1
| | | | | | | | | Update ticks in timeout_hardclock_update to avoid errors in hardclock (this is the third time we mess up here). ticks is only used for timeouts anyway. At the same protect updating ticks with timeout_mutex and be slightly more paranoid in timeout_hardclock_update. ok tdeval@ miod@
* Typo in #endif comment.grange2004-09-151-2/+2
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* Fix typos. Found by Dries Schellekensart2004-08-051-3/+3
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* hardclock detects if ITIMER_VIRTUAL and ITIMER_PROF have expired andart2004-08-041-3/+44
| | | | | | | | | | | | | | | | | | | sends SIGVTALRM and SIGPROF to the process if they had. There is a big problem with calling psignal from hardclock on MULTIPROCESSOR machines though. It means we need to protect all signal state in the process with a lock because hardclock doesn't obtain KERNEL_LOCK. Trying to track down all the tentacles of this quickly becomes very messy. What saves us at the moment is that SCHED_LOCK (which is used to protect parts of the signal state, but not all) happens to be recursive and forgives small and big errors. That's about to change. So instead of trying to hunt down all the locking problems here, just make hardclock not send signals. Instead hardclock schedules a timeout that will send the signal later. There are many reasons why this works just as good as the previous code, all explained in a comment written in big, friendly letters in kern_clock. miod@ ok noone else dared to ok this, but noone screamed in agony either.
* Even when we have timecounters we still have to do the check for secondaryart2004-08-041-3/+3
| | | | | cpus calling hardclock and the statclock emulation. Move some ifdef __HAVE_TIMECOUNTER code.
* This touches only MI code, and adds new time keeping code. Thetholo2004-07-281-7/+24
| | | | | | | | | | | | | | | code is all conditionalized on __HAVE_TIMECOUNTER, and not enabled on any platforms. adjtime(2) support exists, courtesy of nordin@, sysctl(2) support and a concept of quality for each time source attached exists. High quality time sources exists for PIIX4 ACPI timer as well as some AMD power management chips. This will have to be redone once we actually add ACPI support (at that time we need to use the ACPI interfaces to get at these clocks). ok art@ ken@ miod@ jmc@ and many more
* This moves access to wall and uptime variables in MI code,tholo2004-06-241-6/+76
| | | | | | | | | | | | | | encapsulating all such access into wall-defined functions that makes sure locking is done as needed. It also cleans up some uses of wall time vs. uptime some places, but there is sure to be more of these needed as well, particularily in MD code. Also, many current calls to microtime() should probably be changed to getmicrotime(), or to the {,get}microuptime() versions. ok art@ deraadt@ aaron@ matthieu@ beck@ sturm@ millert@ others "Oh, that is not your problem!" from miod@
* First step towards more sane time handling in the kernel -- this changestholo2004-06-211-1/+6
| | | | | | | | things such that code that only need a second-resolution uptime or wall time, and used to get that from time.tv_secs or mono_time.tv_secs now get this from separate time_t globals time_second and time_uptime. ok art@ niklas@ nordin@
* debranch SMP, have funniklas2004-06-131-5/+14
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* Merge in a piece of the SMP branch into HEAD.art2004-06-091-13/+52
| | | | | | | | | | | Introduce the cpu_info structure, p_cpu field in struct proc and global scheduling context and various changed code to deal with this. At the moment no architecture uses this stuff yet, but it will allow us slow and controlled migration to the new APIs. All new code is ifdef:ed out. ok deraadt@ niklas@
* Remove the advertising clause in the UCB license which Berkeleymillert2003-06-021-6/+2
| | | | rescinded 22 July 1999. Proofed by myself and Theo.
* Force "struct timeval time" variable to be aligned to an 8-bit boundary.miod2003-05-131-2/+3
| | | | | | | This is at least necessary for the sparc microtime() function, and was only working before by goat luck. The recent commons removal triggered it. __atribute__ syntax borrowed from NetBSD.
* Restore pentium_microtime, testing by henning@, millert@. ok deraadt@nordin2002-09-241-1/+5
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* Remove kernel support for NTP. ok deraadt@ and tholo@nordin2002-07-061-799/+2
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* Change all variables definitions (int foo) in sys/sys/*.h to variablemiod2002-07-031-1/+3
| | | | declarations (extern int foo), and compensate in the appropriate locations.
* Change addupc_intr to not use fuswintr and suswintr to update the profilingart2002-06-071-2/+2
| | | | | | | | | info. Since we only use it to profile processes in user mode and there is no way to get back user mode without going past the AST that will write out the profiling info in a context where copyout works. Sitting in my tree for ages. Reviewed and with some suggestions from nordin@
* Simplify so that we can remove CLKF_BASEPRI() and spllowersoftclock()nordin2002-06-071-12/+3
| | | | infrastructure. ok art@ and miod@
* Introduce a new file, machine/internal_types.h, to hold that specific archespie2002-04-241-2/+2
| | | | | | | | | | | | | type characteristics. internal_types.h will contain only settings invisible from standard C, e.g., in the __* or _[A-Z]* namespace, and be reused by files like limits.h. This allows us to shorten machine/limits.h greatly, as all the common defines are now in sys/limits.h, plus a small stub in internal_types.h. Tested on all arches as far as I know. Approved after discussion with art, millert, deraadt, and others.
* Don't do unnecessary normalization. ok art@nordin2002-02-181-7/+3
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* Improve comment. ok art@nordin2002-02-151-4/+4
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* Add a tvtohz function. Like hzto, but doesn't subtract the current time.art2002-02-151-1/+51
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* Remove reference to timeout table. deraadt@ oknordin2002-01-021-8/+2
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* New hz value needed by AlphaServer 1200 and a couple other machinesnate2001-12-141-1/+4
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* Replace inclusion of <vm/foo.h> with the correct <uvm/bar.h> when necessary.miod2001-11-061-2/+2
| | | | (Look ma, I might have broken the tree)
* generic soft interrupts for softclock.art2001-08-191-4/+30
| | | | From NetBSD.
* Move the updating of timeout queues to after ticks is incremented.art2000-08-231-8/+4
| | | | | | | | The older code actually ensured that no timeout would be too early, but it violated the principle of least surprise by making it seem (when you looked at the time variable) that every timeout was one tick late. Also periodic timeouts (that readd themselves in the timeout function), will now happen with the frequency you expect.
* Make hzto return 0 for timeouts that should happen now or in the past.art2000-07-071-5/+5
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* Change splsoftclock() to spllowersoftclock(). (art@ ok)ho2000-07-061-2/+2
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* Stop sleeps from returning early (by up to a clock tick).pjanzen2000-07-051-21/+39
| | | | | From FreeBSD: eventually, we should replace hzto() with something like tvtohz() as well.
* Update a comment to reflect reality.art2000-03-231-2/+2
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* New API for timeouts. Replaces the old timeout()/untimeout() API andart2000-03-231-165/+3
| | | | | | | | | | | | | | makes it the callers responsibility to allocate resources for the timeouts. This is a KISS implementation and does _not_ solve the problems of slow handling of a large number of pending timeouts (this will be solved in future work) (although hardclock is now guarateed to take constant time for handling of timeouts). Old timeout() and untimeout() are implemented as wrappers around the new API and kept for compatibility. They will be removed as soon as all subsystems are converted to use the new API.
* Adopt NetBSD fix for scheduler problems (nice was broken). From the NetBSDpjanzen1999-08-151-21/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | commit messages: Scheduler bug fixes and reorganization * fix the ancient nice(1) bug, where nice +20 processes incorrectly steal 10 - 20% of the CPU, (or even more depending on load average) * provide a new schedclock() mechanism at a new clock at schedhz, so high platform hz values don't cause nice +0 processes to look like they are niced * change the algorithm slightly, and reorganize the code a lot * fix percent-CPU calculation bugs, and eliminate some no-op code === nice bug === Correctly divide the scheduler queues between niced and compute-bound processes. The current nice weight of two (sort of, see `algorithm change' below) neatly divides the USRPRI queues in half; this should have been used to clip p_estcpu, instead of UCHAR_MAX. Besides being the wrong amount, clipping an unsigned char to UCHAR_MAX is a no-op, and it was done after decay_cpu() which can only _reduce_ the value. It has to be kept <= NICE_WEIGHT * PRIO_MAX - PPQ or processes can scheduler-penalize themselves onto the same queue as nice +20 processes. (Or even a higher one.) === New schedclock() mechanism === Some platforms should be cutting down stathz before hitting the scheduler, since the scheduler algorithm only works right in the vicinity of 64 Hz. Rather than prescale hz, then scale back and forth by 4 every time p_estcpu is touched (each occurance an abstraction violation), use p_estcpu without scaling and require schedhz to be generated directly at the right frequency. Use a default stathz (well, actually, profhz) / 4, so nothing changes unless a platform defines schedhz and a new clock. [ To do: Define these for alpha, where hz==1024, and nice was totally broke.] === Algorithm change === The nice value used to be added to the exponentially-decayed scheduler history value p_estcpu, in _addition_ to be incorporated directly (with greater weight) into the priority calculation. At first glance, it appears to be a pointless increase of 1/8 the nice effect (pri = p_estcpu/4 + nice*2), but it's actually at least 3x that because it will ramp up linearly but be decayed only exponentially, thus converging to an additional .75 nice for a loadaverage of one. I killed this: it makes the behavior hard to control, almost impossible to analyze, and the effect (~~nothing at for the first second, then somewhat increased niceness after three seconds or more, depending on load average) pointless. === Other bugs === hz -> profhz in the p_pctcpu = f(p_cpticks) calcuation. Collect scheduler functionality. Try to put each abstraction in just one place.
* Undo changes which were not discussed.deraadt1998-08-271-3/+1
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* defopt NTPmickey1998-08-271-1/+3
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* Updates to match type changes in syscall tablestholo1998-02-081-3/+4
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* make it compile w/ GPROFmickey1997-12-301-1/+2
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* nuke prehistoric disk statisticsmickey1997-11-231-16/+1
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* Don't do disruptive time corrections if tick size is not integral; fromtholo1997-01-251-5/+5
| | | | Dennis Ferguson (NetBSD PR #2788)
* Improve adjtime() for odd hz values; from Dennis Ferguson (NetBSD PR# 2787)tholo1997-01-251-2/+2
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* Don't claim a better precision than (1,000,000 / hz) us...tholo1996-09-091-2/+5
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* Declare tickfixcnt only ifndef NTP.briggs1996-06-091-3/+4
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* Make pretty + update $NetBSD$ tag. No functional change.niklas1996-05-031-4/+3
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* sync syscalls, no sys/cpu.hderaadt1996-05-021-2/+1
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* partial sync with netbsd 960418, more to comederaadt1996-04-211-13/+22
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* NetBSD 960317 mergeniklas1996-04-191-266/+671
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* From NetBSD: 960217 mergeniklas1996-03-031-1/+13
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* Make it possible for a port to do special time update handlingtholo1996-02-251-0/+4
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* Implement frequency-locked loop as in original code; was missingtholo1996-02-251-12/+41
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* Add kernel PLL for system clocktholo1996-01-291-45/+396
| | | | | Add ntp_adjtime() and ntp_gettime() system calls Mostly stolen from FreeBSD
* from netbsd:deraadt1996-01-291-2/+2
| | | | | | fix off-by-one error in tickfix code. (should increment when count >= interval, because count goes from 0->(interval-1) to count interval ticks.)
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