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e1d970f181
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.
170 lines
5.2 KiB
C
170 lines
5.2 KiB
C
/*
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* Copyright (c) 1980, 1986, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)param.c 8.3 (Berkeley) 8/20/94
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* $FreeBSD$
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*/
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#include "opt_param.h"
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#include "opt_maxusers.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <machine/vmparam.h>
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/*
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* System parameter formulae.
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*/
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#ifndef HZ
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#define HZ 100
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#endif
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#define NPROC (20 + 16 * maxusers)
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#ifndef NBUF
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#define NBUF 0
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#endif
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#ifndef MAXFILES
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#define MAXFILES (maxproc * 2)
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#endif
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int hz;
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int tick;
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int maxusers; /* base tunable */
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int maxproc; /* maximum # of processes */
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int maxprocperuid; /* max # of procs per user */
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int maxfiles; /* sys. wide open files limit */
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int maxfilesperproc; /* per-proc open files limit */
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int ncallout; /* maximum # of timer events */
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int nbuf;
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int nswbuf;
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int maxswzone; /* max swmeta KVA storage */
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int maxbcache; /* max buffer cache KVA storage */
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u_quad_t maxtsiz; /* max text size */
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u_quad_t dfldsiz; /* initial data size limit */
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u_quad_t maxdsiz; /* max data size */
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u_quad_t dflssiz; /* initial stack size limit */
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u_quad_t maxssiz; /* max stack size */
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u_quad_t sgrowsiz; /* amount to grow stack */
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/*
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* These have to be allocated somewhere; allocating
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* them here forces loader errors if this file is omitted
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* (if they've been externed everywhere else; hah!).
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*/
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struct buf *swbuf;
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/*
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* Boot time overrides that are not scaled against main memory
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*/
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void
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init_param1(void)
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{
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hz = HZ;
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TUNABLE_INT_FETCH("kern.hz", &hz);
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tick = 1000000 / hz;
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#ifdef VM_SWZONE_SIZE_MAX
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maxswzone = VM_SWZONE_SIZE_MAX;
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#endif
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TUNABLE_INT_FETCH("kern.maxswzone", &maxswzone);
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#ifdef VM_BCACHE_SIZE_MAX
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maxbcache = VM_BCACHE_SIZE_MAX;
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#endif
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TUNABLE_INT_FETCH("kern.maxbcache", &maxbcache);
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maxtsiz = MAXTSIZ;
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TUNABLE_QUAD_FETCH("kern.maxtsiz", &maxtsiz);
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dfldsiz = DFLDSIZ;
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TUNABLE_QUAD_FETCH("kern.dfldsiz", &dfldsiz);
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maxdsiz = MAXDSIZ;
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TUNABLE_QUAD_FETCH("kern.maxdsiz", &maxdsiz);
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dflssiz = DFLSSIZ;
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TUNABLE_QUAD_FETCH("kern.dflssiz", &dflssiz);
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maxssiz = MAXSSIZ;
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TUNABLE_QUAD_FETCH("kern.maxssiz", &maxssiz);
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sgrowsiz = SGROWSIZ;
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TUNABLE_QUAD_FETCH("kern.sgrowsiz", &sgrowsiz);
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}
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/*
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* Boot time overrides that are scaled against main memory
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*/
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void
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init_param2(int physpages)
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{
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/* Base parameters */
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maxusers = MAXUSERS;
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TUNABLE_INT_FETCH("kern.maxusers", &maxusers);
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if (maxusers == 0) {
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maxusers = physpages / (2 * 1024 * 1024 / PAGE_SIZE);
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if (maxusers < 32)
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maxusers = 32;
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if (maxusers > 384)
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maxusers = 384;
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}
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/*
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* The following can be overridden after boot via sysctl. Note:
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* unless overriden, these macros are ultimately based on maxusers.
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*/
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maxproc = NPROC;
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TUNABLE_INT_FETCH("kern.maxproc", &maxproc);
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/*
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* Limit maxproc so that kmap entries cannot be exhausted by
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* processes.
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*/
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if (maxproc > (physpages / 12))
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maxproc = physpages / 12;
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maxfiles = MAXFILES;
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TUNABLE_INT_FETCH("kern.maxfiles", &maxfiles);
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maxprocperuid = (maxproc * 9) / 10;
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maxfilesperproc = (maxfiles * 9) / 10;
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/*
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* Cannot be changed after boot.
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*/
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nbuf = NBUF;
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TUNABLE_INT_FETCH("kern.nbuf", &nbuf);
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ncallout = 16 + maxproc + maxfiles;
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TUNABLE_INT_FETCH("kern.ncallout", &ncallout);
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}
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