641 lines
16 KiB
C
641 lines
16 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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* $FreeBSD$
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*/
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#include "opt_vm.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/resourcevar.h>
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#include <sys/shm.h>
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#include <sys/vmmeter.h>
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#include <sys/sx.h>
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#include <sys/sysctl.h>
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#include <sys/kernel.h>
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#include <sys/ktr.h>
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#include <sys/unistd.h>
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#include <machine/limits.h>
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#include <vm/vm.h>
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#include <vm/vm_param.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 <sys/user.h>
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extern int maxslp;
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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(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(void *);
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SYSINIT(scheduler, SI_SUB_RUN_SCHEDULER, SI_ORDER_FIRST, scheduler, NULL)
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#ifndef NO_SWAPPING
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static void swapout(struct proc *);
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#endif
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/*
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* MPSAFE
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*/
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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;
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KASSERT((rw & ~VM_PROT_ALL) == 0,
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("illegal ``rw'' argument to kernacc (%x)\n", rw));
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prot = rw;
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saddr = trunc_page((vm_offset_t)addr);
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eaddr = round_page((vm_offset_t)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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/*
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* MPSAFE
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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;
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KASSERT((rw & ~VM_PROT_ALL) == 0,
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("illegal ``rw'' argument to useracc (%x)\n", rw));
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prot = rw;
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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((vm_offset_t)addr), round_page((vm_offset_t)addr + len),
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prot);
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return (rv == TRUE);
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}
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/*
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* MPSAFE
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*/
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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_wire(&curproc->p_vmspace->vm_map, trunc_page((vm_offset_t)addr),
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round_page((vm_offset_t)addr + len), FALSE);
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}
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/*
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* MPSAFE
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*/
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void
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vsunlock(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_unwire(&curproc->p_vmspace->vm_map,
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trunc_page((vm_offset_t)addr),
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round_page((vm_offset_t)addr + len), FALSE);
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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. The new process is set up so that it returns directly
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* to user mode to avoid stack copying and relocation problems.
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*/
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void
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vm_forkproc(td, p2, td2, flags)
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struct thread *td;
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struct proc *p2;
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struct thread *td2;
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int flags;
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{
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struct proc *p1 = td->td_proc;
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struct user *up;
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GIANT_REQUIRED;
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if ((flags & RFPROC) == 0) {
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/*
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* Divorce the memory, if it is shared, essentially
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* this changes shared memory amongst threads, into
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* COW locally.
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*/
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if ((flags & RFMEM) == 0) {
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if (p1->p_vmspace->vm_refcnt > 1) {
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vmspace_unshare(p1);
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}
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}
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cpu_fork(td, p2, td2, flags);
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return;
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}
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if (flags & RFMEM) {
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p2->p_vmspace = p1->p_vmspace;
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p1->p_vmspace->vm_refcnt++;
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}
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while (vm_page_count_severe()) {
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VM_WAIT;
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}
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if ((flags & RFMEM) == 0) {
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p2->p_vmspace = vmspace_fork(p1->p_vmspace);
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pmap_pinit2(vmspace_pmap(p2->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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pmap_new_proc(p2);
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pmap_new_thread(td2); /* Initial thread */
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/* XXXKSE this is unsatisfactory but should be adequate */
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up = p2->p_uarea;
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/*
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* p_stats currently points at fields in the user struct
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* but not at &u, instead at p_addr. Copy parts of
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* p_stats; zero the rest of p_stats (statistics).
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*
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* If procsig->ps_refcnt is 1 and p2->p_sigacts is NULL we dont' need
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* to share sigacts, so we use the up->u_sigacts.
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*/
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p2->p_stats = &up->u_stats;
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if (p2->p_sigacts == NULL) {
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if (p2->p_procsig->ps_refcnt != 1)
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printf ("PID:%d NULL sigacts with refcnt not 1!\n",p2->p_pid);
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p2->p_sigacts = &up->u_sigacts;
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up->u_sigacts = *p1->p_sigacts;
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}
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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 pcb, set up the kernel stack,
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* and make the child ready to run.
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*/
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cpu_fork(td, p2, td2, flags);
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}
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/*
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* Called after process has been wait(2)'ed apon and is being reaped.
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* The idea is to reclaim resources that we could not reclaim while
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* the process was still executing.
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*/
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void
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vm_waitproc(p)
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struct proc *p;
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{
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struct thread *td;
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GIANT_REQUIRED;
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cpu_wait(p);
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pmap_dispose_proc(p); /* drop per-process resources */
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FOREACH_THREAD_IN_PROC(p, td)
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pmap_dispose_thread(td);
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vmspace_exitfree(p); /* and clean-out the vmspace */
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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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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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struct thread *td;
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GIANT_REQUIRED;
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PROC_LOCK_ASSERT(p, MA_OWNED);
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mtx_lock_spin(&sched_lock);
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if ((p->p_sflag & PS_INMEM) == 0) {
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++p->p_lock;
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mtx_unlock_spin(&sched_lock);
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PROC_UNLOCK(p);
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pmap_swapin_proc(p);
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FOREACH_THREAD_IN_PROC (p, td)
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pmap_swapin_thread(td);
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PROC_LOCK(p);
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mtx_lock_spin(&sched_lock);
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FOREACH_THREAD_IN_PROC (p, td)
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if (td->td_proc->p_stat == SRUN) /* XXXKSE */
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setrunqueue(td);
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p->p_sflag |= PS_INMEM;
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/* undo the effect of setting SLOCK above */
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--p->p_lock;
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}
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mtx_unlock_spin(&sched_lock);
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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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* XXXKSE - KSEGRP with highest priority counts..
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*
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* Giant is still held at this point, to be released in tsleep.
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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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struct proc *p;
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int pri;
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struct proc *pp;
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int ppri;
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mtx_assert(&Giant, MA_OWNED | MA_NOTRECURSED);
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/* GIANT_REQUIRED */
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loop:
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if (vm_page_count_min()) {
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VM_WAIT;
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goto loop;
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}
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pp = NULL;
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ppri = INT_MIN;
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sx_slock(&allproc_lock);
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FOREACH_PROC_IN_SYSTEM(p) {
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struct ksegrp *kg;
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mtx_lock_spin(&sched_lock);
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if (p->p_stat == SRUN
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&& (p->p_sflag & (PS_INMEM | PS_SWAPPING)) == 0) {
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/* Find the minimum sleeptime for the process */
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FOREACH_KSEGRP_IN_PROC(p, kg) {
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pri = p->p_swtime + kg->kg_slptime;
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if ((p->p_sflag & PS_SWAPINREQ) == 0) {
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pri -= kg->kg_nice * 8;
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}
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/*
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* if this ksegrp is higher priority
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* and there is enough space, then select
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* this process instead of the previous
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* selection.
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*/
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if (pri > ppri) {
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pp = p;
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ppri = pri;
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}
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}
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}
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mtx_unlock_spin(&sched_lock);
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}
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sx_sunlock(&allproc_lock);
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/*
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* Nothing to do, back to sleep.
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*/
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if ((p = pp) == NULL) {
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tsleep(&proc0, PVM, "sched", maxslp * hz / 2);
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goto loop;
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}
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mtx_lock_spin(&sched_lock);
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p->p_sflag &= ~PS_SWAPINREQ;
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mtx_unlock_spin(&sched_lock);
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/*
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* We would like to bring someone in. (only if there is space).
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*/
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PROC_LOCK(p);
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faultin(p);
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PROC_UNLOCK(p);
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mtx_lock_spin(&sched_lock);
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p->p_swtime = 0;
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mtx_unlock_spin(&sched_lock);
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goto loop;
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}
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#ifndef NO_SWAPPING
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/*
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* Swap_idle_threshold1 is the guaranteed swapped in time for a process
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*/
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static int swap_idle_threshold1 = 2;
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SYSCTL_INT(_vm, OID_AUTO, swap_idle_threshold1,
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CTLFLAG_RW, &swap_idle_threshold1, 0, "");
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/*
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* Swap_idle_threshold2 is the time that a process can be idle before
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* it will be swapped out, if idle swapping is enabled.
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*/
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static int swap_idle_threshold2 = 10;
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SYSCTL_INT(_vm, OID_AUTO, swap_idle_threshold2,
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CTLFLAG_RW, &swap_idle_threshold2, 0, "");
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/*
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* Swapout is driven by the pageout daemon. Very simple, we find eligible
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* procs and unwire their u-areas. We try to always "swap" at least one
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* process in case we need the room for a swapin.
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* If any procs have been sleeping/stopped for at least maxslp seconds,
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* they are swapped. Else, we swap the longest-sleeping or stopped process,
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* if any, otherwise the longest-resident process.
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*/
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void
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swapout_procs(action)
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int action;
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{
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struct proc *p;
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struct ksegrp *kg;
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struct proc *outp, *outp2;
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int outpri, outpri2;
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int didswap = 0;
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GIANT_REQUIRED;
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outp = outp2 = NULL;
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outpri = outpri2 = INT_MIN;
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retry:
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sx_slock(&allproc_lock);
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LIST_FOREACH(p, &allproc, p_list) {
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struct vmspace *vm;
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int minslptime = 100000;
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PROC_LOCK(p);
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if (p->p_lock != 0 ||
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(p->p_flag & (P_TRACED|P_SYSTEM|P_WEXIT)) != 0) {
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PROC_UNLOCK(p);
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continue;
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}
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/*
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* only aiod changes vmspace, however it will be
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* skipped because of the if statement above checking
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* for P_SYSTEM
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*/
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vm = p->p_vmspace;
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mtx_lock_spin(&sched_lock);
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if ((p->p_sflag & (PS_INMEM|PS_SWAPPING)) != PS_INMEM) {
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mtx_unlock_spin(&sched_lock);
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PROC_UNLOCK(p);
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continue;
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}
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switch (p->p_stat) {
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default:
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mtx_unlock_spin(&sched_lock);
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|
PROC_UNLOCK(p);
|
|
continue;
|
|
|
|
case SSLEEP:
|
|
case SSTOP:
|
|
/*
|
|
* do not swapout a realtime process
|
|
* Check all the thread groups..
|
|
*/
|
|
FOREACH_KSEGRP_IN_PROC(p, kg) {
|
|
if (PRI_IS_REALTIME(kg->kg_pri_class)) {
|
|
mtx_unlock_spin(&sched_lock);
|
|
PROC_UNLOCK(p);
|
|
goto nextproc;
|
|
}
|
|
|
|
/*
|
|
* Do not swapout a process waiting
|
|
* on a critical event of some kind.
|
|
* Also guarantee swap_idle_threshold1
|
|
* time in memory.
|
|
*/
|
|
if (((FIRST_THREAD_IN_PROC(p)->td_priority) < PSOCK) ||
|
|
(kg->kg_slptime < swap_idle_threshold1)) {
|
|
mtx_unlock_spin(&sched_lock);
|
|
PROC_UNLOCK(p);
|
|
goto nextproc;
|
|
}
|
|
|
|
/*
|
|
* If the system is under memory stress,
|
|
* or if we are swapping
|
|
* idle processes >= swap_idle_threshold2,
|
|
* then swap the process out.
|
|
*/
|
|
if (((action & VM_SWAP_NORMAL) == 0) &&
|
|
(((action & VM_SWAP_IDLE) == 0) ||
|
|
(kg->kg_slptime < swap_idle_threshold2))) {
|
|
mtx_unlock_spin(&sched_lock);
|
|
PROC_UNLOCK(p);
|
|
goto nextproc;
|
|
}
|
|
if (minslptime > kg->kg_slptime)
|
|
minslptime = kg->kg_slptime;
|
|
}
|
|
|
|
mtx_unlock_spin(&sched_lock);
|
|
++vm->vm_refcnt;
|
|
/*
|
|
* do not swapout a process that
|
|
* is waiting for VM
|
|
* data structures there is a
|
|
* possible deadlock.
|
|
*/
|
|
if (!vm_map_trylock(&vm->vm_map)) {
|
|
vmspace_free(vm);
|
|
PROC_UNLOCK(p);
|
|
goto nextproc;
|
|
}
|
|
vm_map_unlock(&vm->vm_map);
|
|
/*
|
|
* If the process has been asleep for awhile and had
|
|
* most of its pages taken away already, swap it out.
|
|
*/
|
|
if ((action & VM_SWAP_NORMAL) ||
|
|
((action & VM_SWAP_IDLE) &&
|
|
(minslptime > swap_idle_threshold2))) {
|
|
sx_sunlock(&allproc_lock);
|
|
swapout(p);
|
|
vmspace_free(vm);
|
|
didswap++;
|
|
goto retry;
|
|
}
|
|
PROC_UNLOCK(p);
|
|
vmspace_free(vm);
|
|
}
|
|
nextproc:
|
|
continue;
|
|
}
|
|
sx_sunlock(&allproc_lock);
|
|
/*
|
|
* If we swapped something out, and another process needed memory,
|
|
* then wakeup the sched process.
|
|
*/
|
|
if (didswap)
|
|
wakeup(&proc0);
|
|
}
|
|
|
|
static void
|
|
swapout(p)
|
|
struct proc *p;
|
|
{
|
|
struct thread *td;
|
|
|
|
PROC_LOCK_ASSERT(p, MA_OWNED);
|
|
#if defined(SWAP_DEBUG)
|
|
printf("swapping out %d\n", p->p_pid);
|
|
#endif
|
|
++p->p_stats->p_ru.ru_nswap;
|
|
/*
|
|
* remember the process resident count
|
|
*/
|
|
p->p_vmspace->vm_swrss = vmspace_resident_count(p->p_vmspace);
|
|
|
|
mtx_lock_spin(&sched_lock);
|
|
p->p_sflag &= ~PS_INMEM;
|
|
p->p_sflag |= PS_SWAPPING;
|
|
PROC_UNLOCK(p);
|
|
FOREACH_THREAD_IN_PROC (p, td)
|
|
if (td->td_proc->p_stat == SRUN) /* XXXKSE */
|
|
remrunqueue(td); /* XXXKSE */
|
|
mtx_unlock_spin(&sched_lock);
|
|
|
|
pmap_swapout_proc(p);
|
|
FOREACH_THREAD_IN_PROC(p, td)
|
|
pmap_swapout_thread(td);
|
|
|
|
mtx_lock_spin(&sched_lock);
|
|
p->p_sflag &= ~PS_SWAPPING;
|
|
p->p_swtime = 0;
|
|
mtx_unlock_spin(&sched_lock);
|
|
}
|
|
#endif /* !NO_SWAPPING */
|