030ad08012
in a suboptimal manner. I had also noticed some panics that appeared to be at least superficially caused by this problem. Also, included are some minor mods to support more general handling of page table page faulting. More details in a future commit.
667 lines
17 KiB
C
667 lines
17 KiB
C
/*
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* Copyright (c) 1991, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* The Mach Operating System project at Carnegie-Mellon University.
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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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* from: @(#)vm_glue.c 8.6 (Berkeley) 1/5/94
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*
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*
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* Copyright (c) 1987, 1990 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*
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* $Id: vm_glue.c,v 1.43 1996/03/11 06:11:39 hsu Exp $
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*/
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#include "opt_ddb.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/resourcevar.h>
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#include <sys/buf.h>
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#include <sys/shm.h>
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#include <sys/vmmeter.h>
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#include <sys/kernel.h>
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#include <sys/dkstat.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/vm_inherit.h>
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#include <vm/vm_prot.h>
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#include <vm/lock.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <vm/vm_page.h>
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#include <vm/vm_pageout.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_extern.h>
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#include <vm/vm_object.h>
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#include <vm/vm_pager.h>
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#include <sys/user.h>
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#include <machine/stdarg.h>
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#include <machine/cpu.h>
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/*
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* System initialization
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*
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* Note: proc0 from proc.h
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*/
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static void vm_init_limits __P((void *));
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SYSINIT(vm_limits, SI_SUB_VM_CONF, SI_ORDER_FIRST, vm_init_limits, &proc0)
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/*
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* THIS MUST BE THE LAST INITIALIZATION ITEM!!!
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*
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* Note: run scheduling should be divorced from the vm system.
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*/
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static void scheduler __P((void *));
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SYSINIT(scheduler, SI_SUB_RUN_SCHEDULER, SI_ORDER_FIRST, scheduler, NULL)
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static void swapout __P((struct proc *));
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extern char kstack[];
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/* vm_map_t upages_map; */
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int
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kernacc(addr, len, rw)
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caddr_t addr;
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int len, rw;
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{
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boolean_t rv;
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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);
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return (rv == TRUE);
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}
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int
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useracc(addr, len, rw)
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caddr_t addr;
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int len, rw;
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{
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boolean_t rv;
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vm_prot_t prot = rw == B_READ ? VM_PROT_READ : VM_PROT_WRITE;
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/*
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* XXX - check separately to disallow access to user area and user
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* page tables - they are in the map.
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*
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* XXX - VM_MAXUSER_ADDRESS is an end address, not a max. It was once
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* only used (as an end address) in trap.c. Use it as an end address
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* here too. This bogusness has spread. I just fixed where it was
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* used as a max in vm_mmap.c.
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*/
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if ((vm_offset_t) addr + len > /* XXX */ VM_MAXUSER_ADDRESS
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|| (vm_offset_t) addr + len < (vm_offset_t) addr) {
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return (FALSE);
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}
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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);
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}
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#ifdef KGDB
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/*
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* Change protections on kernel pages from addr to addr+len
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* (presumably so debugger can plant a breakpoint).
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* All addresses are assumed to reside in the Sysmap,
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*/
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chgkprot(addr, len, rw)
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register caddr_t addr;
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int len, rw;
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{
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vm_prot_t prot = rw == B_READ ? VM_PROT_READ : VM_PROT_WRITE;
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vm_map_protect(kernel_map, trunc_page(addr),
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round_page(addr + len), prot, FALSE);
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}
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#endif
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void
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vslock(addr, len)
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caddr_t addr;
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u_int len;
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{
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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)
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caddr_t addr;
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u_int len;
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int dirtied;
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{
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#ifdef lint
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dirtied++;
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#endif /* lint */
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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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}
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/*
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* Implement fork's actions on an address space.
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* Here we arrange for the address space to be copied or referenced,
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* allocate a user struct (pcb and kernel stack), then call the
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* machine-dependent layer to fill those in and make the new process
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* ready to run.
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* NOTE: the kernel stack may be at a different location in the child
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* process, and thus addresses of automatic variables may be invalid
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* after cpu_fork returns in the child process. We do nothing here
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* after cpu_fork returns.
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*/
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int
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vm_fork(p1, p2)
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register struct proc *p1, *p2;
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{
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register struct user *up;
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vm_offset_t addr, ptaddr, ptpa;
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int error, i;
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vm_map_t map;
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pmap_t pvp;
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vm_page_t stkm;
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while ((cnt.v_free_count + cnt.v_cache_count) < cnt.v_free_min) {
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VM_WAIT;
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}
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/*
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* avoid copying any of the parent's pagetables or other per-process
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* objects that reside in the map by marking all of them
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* non-inheritable
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*/
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(void) vm_map_inherit(&p1->p_vmspace->vm_map,
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UPT_MIN_ADDRESS - UPAGES * PAGE_SIZE, VM_MAX_ADDRESS, VM_INHERIT_NONE);
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p2->p_vmspace = vmspace_fork(p1->p_vmspace);
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if (p1->p_vmspace->vm_shm)
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shmfork(p1, p2);
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/*
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* Allocate a wired-down (for now) pcb and kernel stack for the
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* process
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*/
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addr = (vm_offset_t) kstack;
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map = &p2->p_vmspace->vm_map;
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pvp = &p2->p_vmspace->vm_pmap;
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/*
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* allocate object for the upages
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*/
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p2->p_vmspace->vm_upages_obj = vm_object_allocate( OBJT_DEFAULT,
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UPAGES);
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/*
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* put upages into the address space
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*/
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error = vm_map_find(map, p2->p_vmspace->vm_upages_obj, 0,
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&addr, UPT_MIN_ADDRESS - addr, FALSE, VM_PROT_ALL,
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VM_PROT_ALL, 0);
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if (error != KERN_SUCCESS)
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panic("vm_fork: vm_map_find (UPAGES) failed, addr=0x%x, error=%d", addr, error);
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addr += UPAGES * PAGE_SIZE;
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/* allocate space for page tables */
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error = vm_map_find(map, NULL, 0, &addr, UPT_MAX_ADDRESS - addr, FALSE,
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VM_PROT_ALL, VM_PROT_ALL, 0);
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if (error != KERN_SUCCESS)
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panic("vm_fork: vm_map_find (PTES) failed, addr=0x%x, error=%d", addr, error);
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/* get a kernel virtual address for the UPAGES for this proc */
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up = (struct user *) kmem_alloc_pageable(u_map, UPAGES * PAGE_SIZE);
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if (up == NULL)
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panic("vm_fork: u_map allocation failed");
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/*
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* create a pagetable page for the UPAGES in the process address space
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*/
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ptaddr = trunc_page((u_int) vtopte(kstack));
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(void) vm_fault(map, ptaddr, VM_PROT_READ|VM_PROT_WRITE, FALSE);
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ptpa = pmap_extract(pvp, ptaddr);
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if (ptpa == 0) {
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panic("vm_fork: no pte for UPAGES");
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}
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/*
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* hold the page table page for the kernel stack, and fault them in
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*/
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stkm = PHYS_TO_VM_PAGE(ptpa);
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vm_page_hold(stkm);
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for(i=0;i<UPAGES;i++) {
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vm_page_t m;
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/*
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* Get a kernel stack page
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*/
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while ((m = vm_page_alloc(p2->p_vmspace->vm_upages_obj,
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i, VM_ALLOC_NORMAL)) == NULL) {
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VM_WAIT;
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}
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/*
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* Wire the page
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*/
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vm_page_wire(m);
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m->flags &= ~PG_BUSY;
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/*
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* Enter the page into both the kernel and the process
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* address space.
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*/
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pmap_enter( pvp, (vm_offset_t) kstack + i * PAGE_SIZE,
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VM_PAGE_TO_PHYS(m), VM_PROT_READ|VM_PROT_WRITE, 1);
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pmap_kenter(((vm_offset_t) up) + i * PAGE_SIZE,
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VM_PAGE_TO_PHYS(m));
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m->flags &= ~PG_ZERO;
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m->valid = VM_PAGE_BITS_ALL;
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}
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/*
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* The page table page for the kernel stack should be held in memory
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* now.
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*/
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vm_page_unhold(stkm);
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p2->p_addr = up;
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/*
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* p_stats and p_sigacts currently point at fields in the user struct
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* but not at &u, instead at p_addr. Copy p_sigacts and parts of
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* p_stats; zero the rest of p_stats (statistics).
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*/
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p2->p_stats = &up->u_stats;
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p2->p_sigacts = &up->u_sigacts;
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up->u_sigacts = *p1->p_sigacts;
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bzero(&up->u_stats.pstat_startzero,
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(unsigned) ((caddr_t) &up->u_stats.pstat_endzero -
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(caddr_t) &up->u_stats.pstat_startzero));
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bcopy(&p1->p_stats->pstat_startcopy, &up->u_stats.pstat_startcopy,
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((caddr_t) &up->u_stats.pstat_endcopy -
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(caddr_t) &up->u_stats.pstat_startcopy));
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/*
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* cpu_fork will copy and update the kernel stack and pcb, and make
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* the child ready to run. It marks the child so that it can return
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* differently than the parent. It returns twice, once in the parent
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* process and once in the child.
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*/
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return (cpu_fork(p1, p2));
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}
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/*
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* Set default limits for VM system.
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* Called for proc 0, and then inherited by all others.
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*
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* XXX should probably act directly on proc0.
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*/
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static void
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vm_init_limits(udata)
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void *udata;
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{
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register struct proc *p = udata;
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int rss_limit;
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/*
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* Set up the initial limits on process VM. Set the maximum resident
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* set size to be half of (reasonably) available memory. Since this
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* is a soft limit, it comes into effect only when the system is out
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* of memory - half of main memory helps to favor smaller processes,
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* and reduces thrashing of the object cache.
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*/
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p->p_rlimit[RLIMIT_STACK].rlim_cur = DFLSSIZ;
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p->p_rlimit[RLIMIT_STACK].rlim_max = MAXSSIZ;
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p->p_rlimit[RLIMIT_DATA].rlim_cur = DFLDSIZ;
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p->p_rlimit[RLIMIT_DATA].rlim_max = MAXDSIZ;
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/* limit the limit to no less than 2MB */
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rss_limit = max(cnt.v_free_count, 512);
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p->p_rlimit[RLIMIT_RSS].rlim_cur = ptoa(rss_limit);
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p->p_rlimit[RLIMIT_RSS].rlim_max = RLIM_INFINITY;
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}
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void
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faultin(p)
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struct proc *p;
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{
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vm_offset_t i;
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vm_offset_t ptaddr;
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int s;
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if ((p->p_flag & P_INMEM) == 0) {
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vm_map_t map = &p->p_vmspace->vm_map;
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pmap_t pmap = &p->p_vmspace->vm_pmap;
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vm_page_t stkm, m;
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vm_offset_t ptpa;
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int error;
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++p->p_lock;
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ptaddr = trunc_page((u_int) vtopte(kstack));
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(void) vm_fault(map, ptaddr, VM_PROT_READ|VM_PROT_WRITE, FALSE);
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ptpa = pmap_extract(&p->p_vmspace->vm_pmap, ptaddr);
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if (ptpa == 0) {
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panic("vm_fork: no pte for UPAGES");
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}
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stkm = PHYS_TO_VM_PAGE(ptpa);
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vm_page_hold(stkm);
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for(i=0;i<UPAGES;i++) {
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int s;
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s = splhigh();
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retry:
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if ((m = vm_page_lookup(p->p_vmspace->vm_upages_obj, i)) == NULL) {
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if ((m = vm_page_alloc(p->p_vmspace->vm_upages_obj, i, VM_ALLOC_NORMAL)) == NULL) {
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VM_WAIT;
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goto retry;
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}
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} else {
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if ((m->flags & PG_BUSY) || m->busy) {
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m->flags |= PG_WANTED;
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tsleep(m, PVM, "swinuw",0);
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goto retry;
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}
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}
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vm_page_wire(m);
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if (m->valid == VM_PAGE_BITS_ALL)
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m->flags &= ~PG_BUSY;
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splx(s);
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pmap_enter( pmap, (vm_offset_t) kstack + i * PAGE_SIZE,
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VM_PAGE_TO_PHYS(m), VM_PROT_READ|VM_PROT_WRITE, TRUE);
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pmap_kenter(((vm_offset_t) p->p_addr) + i * PAGE_SIZE,
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VM_PAGE_TO_PHYS(m));
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if (m->valid != VM_PAGE_BITS_ALL) {
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int rv;
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rv = vm_pager_get_pages(p->p_vmspace->vm_upages_obj,
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&m, 1, 0);
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if (rv != VM_PAGER_OK)
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panic("faultin: cannot get upages for proc: %d\n", p->p_pid);
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m->valid = VM_PAGE_BITS_ALL;
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m->flags &= ~PG_BUSY;
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}
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}
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vm_page_unhold(stkm);
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|
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s = splhigh();
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if (p->p_stat == SRUN)
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setrunqueue(p);
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p->p_flag |= P_INMEM;
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/* undo the effect of setting SLOCK above */
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--p->p_lock;
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splx(s);
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}
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}
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/*
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* This swapin algorithm attempts to swap-in processes only if there
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* is enough space for them. Of course, if a process waits for a long
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* time, it will be swapped in anyway.
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*/
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/* ARGSUSED*/
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static void
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scheduler(dummy)
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void *dummy;
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{
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register struct proc *p;
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register int pri;
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struct proc *pp;
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int ppri;
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loop:
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while ((cnt.v_free_count + cnt.v_cache_count) < cnt.v_free_min) {
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VM_WAIT;
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}
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pp = NULL;
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ppri = INT_MIN;
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for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) {
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if (p->p_stat == SRUN &&
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(p->p_flag & (P_INMEM | P_SWAPPING)) == 0) {
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int mempri;
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pri = p->p_swtime + p->p_slptime - p->p_nice * 8;
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mempri = pri > 0 ? pri : 0;
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/*
|
|
* if this process is higher priority and there is
|
|
* enough space, then select this process instead of
|
|
* the previous selection.
|
|
*/
|
|
if (pri > ppri) {
|
|
pp = p;
|
|
ppri = pri;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Nothing to do, back to sleep
|
|
*/
|
|
if ((p = pp) == NULL) {
|
|
tsleep(&proc0, PVM, "sched", 0);
|
|
goto loop;
|
|
}
|
|
/*
|
|
* We would like to bring someone in. (only if there is space).
|
|
*/
|
|
faultin(p);
|
|
p->p_swtime = 0;
|
|
goto loop;
|
|
}
|
|
|
|
#ifndef NO_SWAPPING
|
|
|
|
#define swappable(p) \
|
|
(((p)->p_lock == 0) && \
|
|
((p)->p_flag & (P_TRACED|P_NOSWAP|P_SYSTEM|P_INMEM|P_WEXIT|P_PHYSIO|P_SWAPPING)) == P_INMEM)
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
void
|
|
swapout_procs()
|
|
{
|
|
register struct proc *p;
|
|
struct proc *outp, *outp2;
|
|
int outpri, outpri2;
|
|
int didswap = 0;
|
|
|
|
outp = outp2 = NULL;
|
|
outpri = outpri2 = INT_MIN;
|
|
retry:
|
|
for (p = allproc.lh_first; p != 0; p = p->p_list.le_next) {
|
|
if (!swappable(p))
|
|
continue;
|
|
switch (p->p_stat) {
|
|
default:
|
|
continue;
|
|
|
|
case SSLEEP:
|
|
case SSTOP:
|
|
/*
|
|
* do not swapout a realtime process
|
|
*/
|
|
if (p->p_rtprio.type == RTP_PRIO_REALTIME)
|
|
continue;
|
|
|
|
/*
|
|
* do not swapout a process waiting on a critical
|
|
* event of some kind
|
|
*/
|
|
if (((p->p_priority & 0x7f) < PSOCK) ||
|
|
(p->p_slptime <= 4))
|
|
continue;
|
|
|
|
vm_map_reference(&p->p_vmspace->vm_map);
|
|
/*
|
|
* do not swapout a process that is waiting for VM
|
|
* datastructures there is a possible deadlock.
|
|
*/
|
|
if (!lock_try_write(&p->p_vmspace->vm_map.lock)) {
|
|
vm_map_deallocate(&p->p_vmspace->vm_map);
|
|
continue;
|
|
}
|
|
vm_map_unlock(&p->p_vmspace->vm_map);
|
|
/*
|
|
* If the process has been asleep for awhile and had
|
|
* most of its pages taken away already, swap it out.
|
|
*/
|
|
swapout(p);
|
|
vm_map_deallocate(&p->p_vmspace->vm_map);
|
|
didswap++;
|
|
goto retry;
|
|
}
|
|
}
|
|
/*
|
|
* If we swapped something out, and another process needed memory,
|
|
* then wakeup the sched process.
|
|
*/
|
|
if (didswap)
|
|
wakeup(&proc0);
|
|
}
|
|
|
|
static void
|
|
swapout(p)
|
|
register struct proc *p;
|
|
{
|
|
vm_map_t map = &p->p_vmspace->vm_map;
|
|
pmap_t pmap = &p->p_vmspace->vm_pmap;
|
|
vm_offset_t ptaddr;
|
|
int i;
|
|
|
|
++p->p_stats->p_ru.ru_nswap;
|
|
/*
|
|
* remember the process resident count
|
|
*/
|
|
p->p_vmspace->vm_swrss =
|
|
p->p_vmspace->vm_pmap.pm_stats.resident_count;
|
|
|
|
(void) splhigh();
|
|
p->p_flag &= ~P_INMEM;
|
|
p->p_flag |= P_SWAPPING;
|
|
if (p->p_stat == SRUN)
|
|
remrq(p);
|
|
(void) spl0();
|
|
|
|
/*
|
|
* let the upages be paged
|
|
*/
|
|
for(i=0;i<UPAGES;i++) {
|
|
vm_page_t m;
|
|
if ((m = vm_page_lookup(p->p_vmspace->vm_upages_obj, i)) == NULL)
|
|
panic("swapout: upage already missing???");
|
|
m->dirty = VM_PAGE_BITS_ALL;
|
|
vm_page_unwire(m);
|
|
pmap_kremove( (vm_offset_t) p->p_addr + PAGE_SIZE * i);
|
|
}
|
|
pmap_remove(pmap, (vm_offset_t) kstack,
|
|
(vm_offset_t) kstack + PAGE_SIZE * UPAGES);
|
|
|
|
p->p_flag &= ~P_SWAPPING;
|
|
p->p_swtime = 0;
|
|
}
|
|
#endif /* !NO_SWAPPING */
|
|
|
|
#ifdef DDB
|
|
/*
|
|
* DEBUG stuff
|
|
*/
|
|
|
|
int indent;
|
|
|
|
#include <machine/stdarg.h> /* see subr_prf.c */
|
|
|
|
/*ARGSUSED2*/
|
|
void
|
|
#if __STDC__
|
|
iprintf(const char *fmt,...)
|
|
#else
|
|
iprintf(fmt /* , va_alist */ )
|
|
char *fmt;
|
|
|
|
/* va_dcl */
|
|
#endif
|
|
{
|
|
register int i;
|
|
va_list ap;
|
|
|
|
for (i = indent; i >= 8; i -= 8)
|
|
printf("\t");
|
|
while (--i >= 0)
|
|
printf(" ");
|
|
va_start(ap, fmt);
|
|
vprintf(fmt, ap);
|
|
va_end(ap);
|
|
}
|
|
#endif /* DDB */
|