| Age | Commit message (Collapse) | Author | |
|---|---|---|---|
| 2000-08-23 | Move the updating of timeout queues to after ticks is incremented. | Artur Grabowski | |
| 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. | |||
| 2000-07-07 | Make hzto return 0 for timeouts that should happen now or in the past. | Artur Grabowski | |
| 2000-07-06 | Change splsoftclock() to spllowersoftclock(). (art@ ok) | Hakan Olsson | |
| 2000-07-05 | Stop sleeps from returning early (by up to a clock tick). | Paul Janzen | |
| From FreeBSD: eventually, we should replace hzto() with something like tvtohz() as well. | |||
| 2000-03-23 | Update a comment to reflect reality. | Artur Grabowski | |
| 2000-03-23 | New API for timeouts. Replaces the old timeout()/untimeout() API and | Artur Grabowski | |
| 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. | |||
| 1999-08-15 | Adopt NetBSD fix for scheduler problems (nice was broken). From the NetBSD | Paul Janzen | |
| 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. | |||
| 1998-08-27 | Undo changes which were not discussed. | Theo de Raadt | |
| 1998-08-27 | defopt NTP | Michael Shalayeff | |
| 1998-02-08 | Updates to match type changes in syscall tables | Thorsten Lockert | |
| 1997-12-30 | make it compile w/ GPROF | Michael Shalayeff | |
| 1997-11-23 | nuke prehistoric disk statistics | Michael Shalayeff | |
| 1997-01-25 | Don't do disruptive time corrections if tick size is not integral; from | Thorsten Lockert | |
| Dennis Ferguson (NetBSD PR #2788) | |||
| 1997-01-25 | Improve adjtime() for odd hz values; from Dennis Ferguson (NetBSD PR# 2787) | Thorsten Lockert | |
| 1996-09-09 | Don't claim a better precision than (1,000,000 / hz) us... | Thorsten Lockert | |
| 1996-06-09 | Declare tickfixcnt only ifndef NTP. | briggs | |
| 1996-05-03 | Make pretty + update $NetBSD$ tag. No functional change. | Niklas Hallqvist | |
| 1996-05-02 | sync syscalls, no sys/cpu.h | Theo de Raadt | |
| 1996-04-21 | partial sync with netbsd 960418, more to come | Theo de Raadt | |
| 1996-04-19 | NetBSD 960317 merge | Niklas Hallqvist | |
| 1996-03-03 | From NetBSD: 960217 merge | Niklas Hallqvist | |
| 1996-02-25 | Make it possible for a port to do special time update handling | Thorsten Lockert | |
| 1996-02-25 | Implement frequency-locked loop as in original code; was missing | Thorsten Lockert | |
| 1996-01-29 | Add kernel PLL for system clock | Thorsten Lockert | |
| Add ntp_adjtime() and ntp_gettime() system calls Mostly stolen from FreeBSD | |||
| 1996-01-29 | from netbsd: | Theo de Raadt | |
| fix off-by-one error in tickfix code. (should increment when count >= interval, because count goes from 0->(interval-1) to count interval ticks.) | |||
| 1995-12-30 | from netbsd: | Theo de Raadt | |
| Move the old-style disk instrumentation "structures" to a central location (sys/kern/subr_disk.c) and note that they should/will be deprecated. | |||
| 1995-10-18 | initial import of NetBSD tree | Theo de Raadt | |
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