NetBSD/sys/vm/vm_glue.c

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/* $NetBSD: vm_glue.c,v 1.45 1995/04/10 16:53:51 mycroft Exp $ */
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/*
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* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
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*
* This code is derived from software contributed to Berkeley by
* The Mach Operating System project at Carnegie-Mellon University.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)vm_glue.c 8.6 (Berkeley) 1/5/94
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*
*
* Copyright (c) 1987, 1990 Carnegie-Mellon University.
* All rights reserved.
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
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#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/resourcevar.h>
#include <sys/buf.h>
#include <sys/user.h>
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#include <vm/vm.h>
#include <vm/vm_page.h>
#include <vm/vm_kern.h>
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#include <machine/cpu.h>
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int avefree = 0; /* XXX */
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unsigned maxdmap = MAXDSIZ; /* XXX */
unsigned maxsmap = MAXSSIZ; /* XXX */
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int readbuffers = 0; /* XXX allow kgdb to read kernel buffer pool */
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int
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kernacc(addr, len, rw)
caddr_t addr;
int len, rw;
{
boolean_t rv;
vm_offset_t saddr, eaddr;
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vm_prot_t prot = rw == B_READ ? VM_PROT_READ : VM_PROT_WRITE;
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saddr = trunc_page(addr);
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eaddr = round_page(addr+len);
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rv = vm_map_check_protection(kernel_map, saddr, eaddr, prot);
/*
* XXX there are still some things (e.g. the buffer cache) that
* are managed behind the VM system's back so even though an
* address is accessible in the mind of the VM system, there may
* not be physical pages where the VM thinks there is. This can
* lead to bogus allocation of pages in the kernel address space
* or worse, inconsistencies at the pmap level. We only worry
* about the buffer cache for now.
*/
if (!readbuffers && rv && (eaddr > (vm_offset_t)buffers &&
saddr < (vm_offset_t)buffers + MAXBSIZE * nbuf))
rv = FALSE;
return(rv == TRUE);
}
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int
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useracc(addr, len, rw)
caddr_t addr;
int len, rw;
{
boolean_t rv;
vm_prot_t prot = rw == B_READ ? VM_PROT_READ : VM_PROT_WRITE;
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#if defined(i386) || defined(pc532)
/*
* XXX - specially disallow access to user page tables - they are
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* in the map. This is here until i386 & pc532 pmaps are fixed...
*/
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if ((vm_offset_t) addr >= VM_MAXUSER_ADDRESS
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|| (vm_offset_t) addr + len > VM_MAXUSER_ADDRESS
|| (vm_offset_t) addr + len <= (vm_offset_t) addr)
return (FALSE);
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#endif
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rv = vm_map_check_protection(&curproc->p_vmspace->vm_map,
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trunc_page(addr), round_page(addr+len), prot);
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return(rv == TRUE);
}
#ifdef KGDB
/*
* Change protections on kernel pages from addr to addr+len
* (presumably so debugger can plant a breakpoint).
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*
* We force the protection change at the pmap level. If we were
* to use vm_map_protect a change to allow writing would be lazily-
* applied meaning we would still take a protection fault, something
* we really don't want to do. It would also fragment the kernel
* map unnecessarily. We cannot use pmap_protect since it also won't
* enforce a write-enable request. Using pmap_enter is the only way
* we can ensure the change takes place properly.
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*/
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void
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chgkprot(addr, len, rw)
register caddr_t addr;
int len, rw;
{
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vm_prot_t prot;
vm_offset_t pa, sva, eva;
prot = rw == B_READ ? VM_PROT_READ : VM_PROT_READ|VM_PROT_WRITE;
eva = round_page(addr + len);
for (sva = trunc_page(addr); sva < eva; sva += PAGE_SIZE) {
/*
* Extract physical address for the page.
* We use a cheezy hack to differentiate physical
* page 0 from an invalid mapping, not that it
* really matters...
*/
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pa = pmap_extract(pmap_kernel(), sva|1);
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if (pa == 0)
panic("chgkprot: invalid page");
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pmap_enter(pmap_kernel(), sva, pa&~1, prot, TRUE);
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}
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}
#endif
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void
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vslock(addr, len)
caddr_t addr;
u_int len;
{
vm_map_pageable(&curproc->p_vmspace->vm_map, trunc_page(addr),
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round_page(addr+len), FALSE);
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}
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void
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vsunlock(addr, len, dirtied)
caddr_t addr;
u_int len;
int dirtied;
{
#ifdef lint
dirtied++;
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#endif
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vm_map_pageable(&curproc->p_vmspace->vm_map, trunc_page(addr),
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round_page(addr+len), TRUE);
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}
/*
* Implement fork's actions on an address space.
* Here we arrange for the address space to be copied or referenced,
* allocate a user struct (pcb and kernel stack), then call the
* machine-dependent layer to fill those in and make the new process
* ready to run.
* NOTE: the kernel stack may be at a different location in the child
* process, and thus addresses of automatic variables may be invalid
* after cpu_fork returns in the child process. We do nothing here
* after cpu_fork returns.
*/
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int
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vm_fork(p1, p2, isvfork)
register struct proc *p1, *p2;
int isvfork;
{
register struct user *up;
vm_offset_t addr;
#if defined(i386) || defined(pc532)
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/*
* avoid copying any of the parent's pagetables or other per-process
* objects that reside in the map by marking all of them non-inheritable
*/
(void)vm_map_inherit(&p1->p_vmspace->vm_map,
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VM_MAXUSER_ADDRESS, VM_MAX_ADDRESS, VM_INHERIT_NONE);
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#endif
p2->p_vmspace = vmspace_fork(p1->p_vmspace);
#ifdef SYSVSHM
if (p1->p_vmspace->vm_shm)
shmfork(p1, p2, isvfork);
#endif
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#if !defined(i386) && !defined(pc532)
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/*
* Allocate a wired-down (for now) pcb and kernel stack for the process
*/
addr = kmem_alloc_pageable(kernel_map, USPACE);
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if (addr == 0)
panic("vm_fork: no more kernel virtual memory");
vm_map_pageable(kernel_map, addr, addr + USPACE, FALSE);
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#else
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/*
* XXX somehow, on 386, ocassionally pageout removes active, wired down
* kstack and pagetables, WITHOUT going thru vm_page_unwire! Why this
* appears to work is not yet clear, yet it does...
*/
addr = kmem_alloc(kernel_map, USPACE);
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if (addr == 0)
panic("vm_fork: no more kernel virtual memory");
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#endif
up = (struct user *)addr;
p2->p_addr = up;
/*
* p_stats and p_sigacts currently point at fields
* in the user struct but not at &u, instead at p_addr.
* Copy p_sigacts and parts of p_stats; zero the rest
* of p_stats (statistics).
*/
p2->p_stats = &up->u_stats;
p2->p_sigacts = &up->u_sigacts;
up->u_sigacts = *p1->p_sigacts;
bzero(&up->u_stats.pstat_startzero,
(unsigned) ((caddr_t)&up->u_stats.pstat_endzero -
(caddr_t)&up->u_stats.pstat_startzero));
bcopy(&p1->p_stats->pstat_startcopy, &up->u_stats.pstat_startcopy,
((caddr_t)&up->u_stats.pstat_endcopy -
(caddr_t)&up->u_stats.pstat_startcopy));
#if defined(i386) || defined(pc532)
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{ vm_offset_t addr = VM_MAXUSER_ADDRESS; struct vm_map *vp;
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/* ream out old pagetables and kernel stack */
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vp = &p2->p_vmspace->vm_map;
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(void)vm_deallocate(vp, addr, VM_MAX_ADDRESS - addr);
(void)vm_allocate(vp, &addr, VM_MAX_ADDRESS - addr, FALSE);
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(void)vm_map_inherit(vp, addr, VM_MAX_ADDRESS, VM_INHERIT_NONE);
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}
#endif
/*
* cpu_fork will copy and update the kernel stack and pcb,
* and make the child ready to run. It marks the child
* so that it can return differently than the parent.
* It returns twice, once in the parent process and
* once in the child.
*/
return (cpu_fork(p1, p2));
}
/*
* Set default limits for VM system.
* Called for proc 0, and then inherited by all others.
*/
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void
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vm_init_limits(p)
register struct proc *p;
{
/*
* Set up the initial limits on process VM.
* Set the maximum resident set size to be all
* of (reasonably) available memory. This causes
* any single, large process to start random page
* replacement once it fills memory.
*/
p->p_rlimit[RLIMIT_STACK].rlim_cur = DFLSSIZ;
p->p_rlimit[RLIMIT_STACK].rlim_max = MAXSSIZ;
p->p_rlimit[RLIMIT_DATA].rlim_cur = DFLDSIZ;
p->p_rlimit[RLIMIT_DATA].rlim_max = MAXDSIZ;
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p->p_rlimit[RLIMIT_RSS].rlim_cur = ptoa(cnt.v_free_count);
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}
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#include <vm/vm_pageout.h>
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#ifdef DEBUG
int enableswap = 1;
int swapdebug = 0;
#define SDB_FOLLOW 1
#define SDB_SWAPIN 2
#define SDB_SWAPOUT 4
#endif
/*
* Brutally simple:
* 1. Attempt to swapin every swaped-out, runnable process in
* order of priority.
* 2. If not enough memory, wake the pageout daemon and let it
* clear some space.
*/
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void
scheduler()
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{
register struct proc *p;
register int pri;
struct proc *pp;
int ppri;
vm_offset_t addr;
vm_size_t size;
loop:
#ifdef DEBUG
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while (!enableswap)
tsleep((caddr_t)&proc0, PVM, "noswap", 0);
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#endif
pp = NULL;
ppri = INT_MIN;
for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) {
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if (p->p_stat == SRUN && (p->p_flag & P_INMEM) == 0) {
pri = p->p_swtime + p->p_slptime - p->p_nice * 8;
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if (pri > ppri) {
pp = p;
ppri = pri;
}
}
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}
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#ifdef DEBUG
if (swapdebug & SDB_FOLLOW)
printf("scheduler: running, procp %x pri %d\n", pp, ppri);
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#endif
/*
* Nothing to do, back to sleep
*/
if ((p = pp) == NULL) {
tsleep((caddr_t)&proc0, PVM, "scheduler", 0);
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goto loop;
}
/*
* We would like to bring someone in.
* This part is really bogus cuz we could deadlock on memory
* despite our feeble check.
*/
size = round_page(USPACE);
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addr = (vm_offset_t) p->p_addr;
if (cnt.v_free_count > atop(size)) {
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#ifdef DEBUG
if (swapdebug & SDB_SWAPIN)
printf("swapin: pid %d(%s)@%x, pri %d free %d\n",
p->p_pid, p->p_comm, p->p_addr,
ppri, cnt.v_free_count);
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#endif
vm_map_pageable(kernel_map, addr, addr+size, FALSE);
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/*
* Some architectures need to be notified when the
* user area has moved to new physical page(s) (e.g.
* see pmax/pmax/vm_machdep.c).
*/
cpu_swapin(p);
(void) splstatclock();
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if (p->p_stat == SRUN)
setrunqueue(p);
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p->p_flag |= P_INMEM;
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(void) spl0();
p->p_swtime = 0;
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goto loop;
}
/*
* Not enough memory, jab the pageout daemon and wait til the
* coast is clear.
*/
#ifdef DEBUG
if (swapdebug & SDB_FOLLOW)
printf("scheduler: no room for pid %d(%s), free %d\n",
p->p_pid, p->p_comm, cnt.v_free_count);
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#endif
(void) splhigh();
VM_WAIT;
(void) spl0();
#ifdef DEBUG
if (swapdebug & SDB_FOLLOW)
printf("scheduler: room again, free %d\n", cnt.v_free_count);
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#endif
goto loop;
}
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#define swappable(p) \
(((p)->p_flag & (P_SYSTEM | P_INMEM | P_WEXIT)) == P_INMEM && \
(p)->p_holdcnt == 0)
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/*
* Swapout is driven by the pageout daemon. Very simple, we find eligible
* procs and unwire their u-areas. We try to always "swap" at least one
* process in case we need the room for a swapin.
* If any procs have been sleeping/stopped for at least maxslp seconds,
* they are swapped. Else, we swap the longest-sleeping or stopped process,
* if any, otherwise the longest-resident process.
*/
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void
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swapout_threads()
{
register struct proc *p;
struct proc *outp, *outp2;
int outpri, outpri2;
int didswap = 0;
extern int maxslp;
#ifdef DEBUG
if (!enableswap)
return;
#endif
outp = outp2 = NULL;
outpri = outpri2 = 0;
for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) {
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if (!swappable(p))
continue;
switch (p->p_stat) {
case SRUN:
if (p->p_swtime > outpri2) {
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outp2 = p;
outpri2 = p->p_swtime;
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}
continue;
case SSLEEP:
case SSTOP:
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if (p->p_slptime >= maxslp) {
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swapout(p);
didswap++;
} else if (p->p_slptime > outpri) {
outp = p;
outpri = p->p_slptime;
}
continue;
}
}
/*
* If we didn't get rid of any real duds, toss out the next most
* likely sleeping/stopped or running candidate. We only do this
* if we are real low on memory since we don't gain much by doing
* it (USPACE bytes).
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*/
if (didswap == 0 &&
cnt.v_free_count <= atop(round_page(USPACE))) {
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if ((p = outp) == 0)
p = outp2;
#ifdef DEBUG
if (swapdebug & SDB_SWAPOUT)
printf("swapout_threads: no duds, try procp %x\n", p);
#endif
if (p)
swapout(p);
}
}
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void
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swapout(p)
register struct proc *p;
{
vm_offset_t addr;
vm_size_t size;
#ifdef DEBUG
if (swapdebug & SDB_SWAPOUT)
printf("swapout: pid %d(%s)@%x, stat %x pri %d free %d\n",
p->p_pid, p->p_comm, p->p_addr, p->p_stat,
p->p_slptime, cnt.v_free_count);
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#endif
size = round_page(USPACE);
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addr = (vm_offset_t) p->p_addr;
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#ifdef notyet /* XXX GC -- enable swapping! */
#ifdef m68k
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/*
* Ugh! u-area is double mapped to a fixed address behind the
* back of the VM system and accesses are usually through that
* address rather than the per-process address. Hence reference
* and modify information are recorded at the fixed address and
* lost at context switch time. We assume the u-struct and
* kernel stack are always accessed/modified and force it to be so.
*/
{
register int i;
volatile long tmp;
for (i = 0; i < UPAGES; i++) {
tmp = *(long *)addr; *(long *)addr = tmp;
addr += NBPG;
}
addr = (vm_offset_t) p->p_addr;
}
#endif
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#ifdef mips
/*
* Be sure to save the floating point coprocessor state before
* paging out the u-struct.
*/
{
extern struct proc *machFPCurProcPtr;
if (p == machFPCurProcPtr) {
MachSaveCurFPState(p);
machFPCurProcPtr = (struct proc *)0;
}
}
#endif
/* temporary measure till we find spontaneous unwire of kstack */
#if !defined(i386) && !defined(pc532)
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vm_map_pageable(kernel_map, addr, addr+size, TRUE);
pmap_collect(vm_map_pmap(&p->p_vmspace->vm_map));
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#endif
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#endif
(void) splhigh();
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p->p_flag &= ~P_INMEM;
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if (p->p_stat == SRUN)
remrq(p);
(void) spl0();
p->p_swtime = 0;
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}
/*
* The rest of these routines fake thread handling
*/
void
assert_wait(event, ruptible)
void *event;
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boolean_t ruptible;
{
#ifdef lint
ruptible++;
#endif
curproc->p_thread = event;
}
void
thread_block()
{
int s = splhigh();
if (curproc->p_thread)
tsleep(curproc->p_thread, PVM, "thrd_block", 0);
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splx(s);
}
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void
thread_sleep(event, lock, ruptible)
void *event;
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simple_lock_t lock;
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boolean_t ruptible;
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{
int s = splhigh();
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#ifdef lint
ruptible++;
#endif
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curproc->p_thread = event;
simple_unlock(lock);
if (curproc->p_thread)
tsleep(event, PVM, "thrd_sleep", 0);
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splx(s);
}
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void
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thread_wakeup(event)
void *event;
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{
int s = splhigh();
wakeup(event);
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splx(s);
}
/*
* DEBUG stuff
*/
int indent = 0;
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#include <machine/stdarg.h> /* see subr_prf.c */
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/*ARGSUSED2*/
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void
#if __STDC__
iprintf(void (*pr)(const char *, ...), const char *fmt, ...)
#else
iprintf(pr, fmt /* , va_alist */)
void (*pr)();
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char *fmt;
/* va_dcl */
#endif
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{
register int i;
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va_list ap;
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for (i = indent; i >= 8; i -= 8)
(*pr)("\t");
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while (--i >= 0)
(*pr)(" ");
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va_start(ap, fmt);
(*pr)("%r", fmt, ap);
va_end(ap);
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}