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4722175765
config option in pmap. Fix a problem with faulting in pages. Clean-up some loose ends in swap pager memory management. The system should be much more stable, but all subtile bugs aren't fixed yet.
1591 lines
36 KiB
C
1591 lines
36 KiB
C
/*
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* Copyright (c) 1991 Regents of the University of California.
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* 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_page.c 7.4 (Berkeley) 5/7/91
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* $Id: vm_page.c,v 1.85 1998/01/12 01:44:41 dyson Exp $
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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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* Authors: Avadis Tevanian, Jr., Michael Wayne Young
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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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/*
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* Resident memory management module.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/proc.h>
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#include <sys/vmmeter.h>
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#include <sys/vnode.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_prot.h>
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#include <sys/lock.h>
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#include <vm/vm_kern.h>
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#include <vm/vm_object.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_extern.h>
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static void vm_page_queue_init __P((void));
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static vm_page_t vm_page_select_free __P((vm_object_t object,
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vm_pindex_t pindex, int prefqueue));
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/*
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* Associated with page of user-allocatable memory is a
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* page structure.
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*/
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static struct pglist *vm_page_buckets; /* Array of buckets */
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static int vm_page_bucket_count; /* How big is array? */
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static int vm_page_hash_mask; /* Mask for hash function */
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struct pglist vm_page_queue_free[PQ_L2_SIZE] = {0};
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struct pglist vm_page_queue_zero[PQ_L2_SIZE] = {0};
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struct pglist vm_page_queue_active = {0};
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struct pglist vm_page_queue_inactive = {0};
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struct pglist vm_page_queue_cache[PQ_L2_SIZE] = {0};
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int no_queue=0;
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struct vpgqueues vm_page_queues[PQ_COUNT] = {0};
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int pqcnt[PQ_COUNT] = {0};
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static void
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vm_page_queue_init(void) {
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int i;
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vm_page_queues[PQ_NONE].pl = NULL;
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vm_page_queues[PQ_NONE].cnt = &no_queue;
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for(i=0;i<PQ_L2_SIZE;i++) {
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vm_page_queues[PQ_FREE+i].pl = &vm_page_queue_free[i];
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vm_page_queues[PQ_FREE+i].cnt = &cnt.v_free_count;
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}
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for(i=0;i<PQ_L2_SIZE;i++) {
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vm_page_queues[PQ_ZERO+i].pl = &vm_page_queue_zero[i];
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vm_page_queues[PQ_ZERO+i].cnt = &cnt.v_free_count;
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}
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vm_page_queues[PQ_INACTIVE].pl = &vm_page_queue_inactive;
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vm_page_queues[PQ_INACTIVE].cnt = &cnt.v_inactive_count;
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vm_page_queues[PQ_ACTIVE].pl = &vm_page_queue_active;
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vm_page_queues[PQ_ACTIVE].cnt = &cnt.v_active_count;
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for(i=0;i<PQ_L2_SIZE;i++) {
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vm_page_queues[PQ_CACHE+i].pl = &vm_page_queue_cache[i];
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vm_page_queues[PQ_CACHE+i].cnt = &cnt.v_cache_count;
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}
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for(i=0;i<PQ_COUNT;i++) {
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if (vm_page_queues[i].pl) {
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TAILQ_INIT(vm_page_queues[i].pl);
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} else if (i != 0) {
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panic("vm_page_queue_init: queue %d is null", i);
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}
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vm_page_queues[i].lcnt = &pqcnt[i];
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}
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}
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vm_page_t vm_page_array = 0;
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int vm_page_array_size = 0;
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long first_page = 0;
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static long last_page;
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static vm_size_t page_mask;
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static int page_shift;
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int vm_page_zero_count = 0;
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/*
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* map of contiguous valid DEV_BSIZE chunks in a page
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* (this list is valid for page sizes upto 16*DEV_BSIZE)
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*/
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static u_short vm_page_dev_bsize_chunks[] = {
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0x0, 0x1, 0x3, 0x7, 0xf, 0x1f, 0x3f, 0x7f, 0xff,
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0x1ff, 0x3ff, 0x7ff, 0xfff, 0x1fff, 0x3fff, 0x7fff, 0xffff
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};
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static inline int vm_page_hash __P((vm_object_t object, vm_pindex_t pindex));
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static int vm_page_freechk_and_unqueue __P((vm_page_t m));
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static void vm_page_free_wakeup __P((void));
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/*
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* vm_set_page_size:
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*
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* Sets the page size, perhaps based upon the memory
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* size. Must be called before any use of page-size
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* dependent functions.
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*
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* Sets page_shift and page_mask from cnt.v_page_size.
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*/
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void
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vm_set_page_size()
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{
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if (cnt.v_page_size == 0)
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cnt.v_page_size = DEFAULT_PAGE_SIZE;
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page_mask = cnt.v_page_size - 1;
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if ((page_mask & cnt.v_page_size) != 0)
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panic("vm_set_page_size: page size not a power of two");
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for (page_shift = 0;; page_shift++)
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if ((1 << page_shift) == cnt.v_page_size)
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break;
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}
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/*
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* vm_page_startup:
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*
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* Initializes the resident memory module.
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*
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* Allocates memory for the page cells, and
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* for the object/offset-to-page hash table headers.
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* Each page cell is initialized and placed on the free list.
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*/
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vm_offset_t
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vm_page_startup(starta, enda, vaddr)
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register vm_offset_t starta;
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vm_offset_t enda;
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register vm_offset_t vaddr;
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{
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register vm_offset_t mapped;
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register vm_page_t m;
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register struct pglist *bucket;
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vm_size_t npages, page_range;
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register vm_offset_t new_start;
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int i;
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vm_offset_t pa;
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int nblocks;
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vm_offset_t first_managed_page;
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/* the biggest memory array is the second group of pages */
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vm_offset_t start;
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vm_offset_t biggestone, biggestsize;
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vm_offset_t total;
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total = 0;
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biggestsize = 0;
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biggestone = 0;
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nblocks = 0;
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vaddr = round_page(vaddr);
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for (i = 0; phys_avail[i + 1]; i += 2) {
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phys_avail[i] = round_page(phys_avail[i]);
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phys_avail[i + 1] = trunc_page(phys_avail[i + 1]);
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}
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for (i = 0; phys_avail[i + 1]; i += 2) {
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int size = phys_avail[i + 1] - phys_avail[i];
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if (size > biggestsize) {
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biggestone = i;
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biggestsize = size;
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}
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++nblocks;
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total += size;
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}
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start = phys_avail[biggestone];
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/*
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* Initialize the queue headers for the free queue, the active queue
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* and the inactive queue.
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*/
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vm_page_queue_init();
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/*
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* Allocate (and initialize) the hash table buckets.
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*
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* The number of buckets MUST BE a power of 2, and the actual value is
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* the next power of 2 greater than the number of physical pages in
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* the system.
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*
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* Note: This computation can be tweaked if desired.
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*/
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vm_page_buckets = (struct pglist *) vaddr;
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bucket = vm_page_buckets;
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if (vm_page_bucket_count == 0) {
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vm_page_bucket_count = 1;
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while (vm_page_bucket_count < atop(total))
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vm_page_bucket_count <<= 1;
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}
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vm_page_hash_mask = vm_page_bucket_count - 1;
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/*
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* Validate these addresses.
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*/
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new_start = start + vm_page_bucket_count * sizeof(struct pglist);
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new_start = round_page(new_start);
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mapped = vaddr;
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vaddr = pmap_map(mapped, start, new_start,
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VM_PROT_READ | VM_PROT_WRITE);
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start = new_start;
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bzero((caddr_t) mapped, vaddr - mapped);
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mapped = vaddr;
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for (i = 0; i < vm_page_bucket_count; i++) {
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TAILQ_INIT(bucket);
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bucket++;
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}
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/*
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* Validate these zone addresses.
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*/
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new_start = start + (vaddr - mapped);
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pmap_map(mapped, start, new_start, VM_PROT_READ | VM_PROT_WRITE);
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bzero((caddr_t) mapped, (vaddr - mapped));
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start = round_page(new_start);
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/*
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* Compute the number of pages of memory that will be available for
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* use (taking into account the overhead of a page structure per
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* page).
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*/
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first_page = phys_avail[0] / PAGE_SIZE;
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last_page = phys_avail[(nblocks - 1) * 2 + 1] / PAGE_SIZE;
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page_range = last_page - (phys_avail[0] / PAGE_SIZE);
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npages = (total - (page_range * sizeof(struct vm_page)) -
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(start - phys_avail[biggestone])) / PAGE_SIZE;
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/*
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* Initialize the mem entry structures now, and put them in the free
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* queue.
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*/
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vm_page_array = (vm_page_t) vaddr;
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mapped = vaddr;
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/*
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* Validate these addresses.
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*/
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new_start = round_page(start + page_range * sizeof(struct vm_page));
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mapped = pmap_map(mapped, start, new_start,
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VM_PROT_READ | VM_PROT_WRITE);
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start = new_start;
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first_managed_page = start / PAGE_SIZE;
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/*
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* Clear all of the page structures
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*/
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bzero((caddr_t) vm_page_array, page_range * sizeof(struct vm_page));
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vm_page_array_size = page_range;
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cnt.v_page_count = 0;
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cnt.v_free_count = 0;
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for (i = 0; phys_avail[i + 1] && npages > 0; i += 2) {
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if (i == biggestone)
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pa = ptoa(first_managed_page);
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else
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pa = phys_avail[i];
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while (pa < phys_avail[i + 1] && npages-- > 0) {
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++cnt.v_page_count;
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++cnt.v_free_count;
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m = PHYS_TO_VM_PAGE(pa);
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m->phys_addr = pa;
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m->flags = 0;
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m->pc = (pa >> PAGE_SHIFT) & PQ_L2_MASK;
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m->queue = PQ_FREE + m->pc;
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TAILQ_INSERT_TAIL(vm_page_queues[m->queue].pl, m, pageq);
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++(*vm_page_queues[m->queue].lcnt);
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pa += PAGE_SIZE;
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}
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}
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return (mapped);
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}
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/*
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* vm_page_hash:
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*
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* Distributes the object/offset key pair among hash buckets.
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*
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* NOTE: This macro depends on vm_page_bucket_count being a power of 2.
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*/
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static inline int
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vm_page_hash(object, pindex)
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vm_object_t object;
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vm_pindex_t pindex;
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{
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return ((((unsigned) object) >> 5) + (pindex >> 1)) & vm_page_hash_mask;
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}
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/*
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* vm_page_insert: [ internal use only ]
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*
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* Inserts the given mem entry into the object/object-page
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* table and object list.
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*
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* The object and page must be locked, and must be splhigh.
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*/
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void
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vm_page_insert(m, object, pindex)
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register vm_page_t m;
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register vm_object_t object;
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register vm_pindex_t pindex;
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{
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register struct pglist *bucket;
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if (m->flags & PG_TABLED)
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panic("vm_page_insert: already inserted");
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/*
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* Record the object/offset pair in this page
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*/
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m->object = object;
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m->pindex = pindex;
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/*
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* Insert it into the object_object/offset hash table
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*/
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bucket = &vm_page_buckets[vm_page_hash(object, pindex)];
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TAILQ_INSERT_TAIL(bucket, m, hashq);
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/*
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* Now link into the object's list of backed pages.
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*/
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TAILQ_INSERT_TAIL(&object->memq, m, listq);
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m->flags |= PG_TABLED;
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m->object->page_hint = m;
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/*
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* And show that the object has one more resident page.
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*/
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object->resident_page_count++;
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}
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/*
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* vm_page_remove: [ internal use only ]
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* NOTE: used by device pager as well -wfj
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*
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* Removes the given mem entry from the object/offset-page
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* table and the object page list.
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*
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* The object and page must be locked, and at splhigh.
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*/
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void
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vm_page_remove(m)
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register vm_page_t m;
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{
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register struct pglist *bucket;
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if (!(m->flags & PG_TABLED))
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return;
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if (m->object->page_hint == m)
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m->object->page_hint = NULL;
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/*
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* Remove from the object_object/offset hash table
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*/
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bucket = &vm_page_buckets[vm_page_hash(m->object, m->pindex)];
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TAILQ_REMOVE(bucket, m, hashq);
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/*
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* Now remove from the object's list of backed pages.
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*/
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TAILQ_REMOVE(&m->object->memq, m, listq);
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/*
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* And show that the object has one fewer resident page.
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*/
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m->object->resident_page_count--;
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m->flags &= ~PG_TABLED;
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}
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/*
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* vm_page_lookup:
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*
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* Returns the page associated with the object/offset
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* pair specified; if none is found, NULL is returned.
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*
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* The object must be locked. No side effects.
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*/
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vm_page_t
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vm_page_lookup(object, pindex)
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register vm_object_t object;
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register vm_pindex_t pindex;
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{
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register vm_page_t m;
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register struct pglist *bucket;
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int s;
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/*
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* Search the hash table for this object/offset pair
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*/
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bucket = &vm_page_buckets[vm_page_hash(object, pindex)];
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s = splvm();
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for (m = TAILQ_FIRST(bucket); m != NULL; m = TAILQ_NEXT(m,hashq)) {
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if ((m->object == object) && (m->pindex == pindex)) {
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splx(s);
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m->object->page_hint = m;
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return (m);
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}
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}
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splx(s);
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return (NULL);
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}
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/*
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* vm_page_rename:
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*
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* Move the given memory entry from its
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* current object to the specified target object/offset.
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*
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* The object must be locked.
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*/
|
|
void
|
|
vm_page_rename(m, new_object, new_pindex)
|
|
register vm_page_t m;
|
|
register vm_object_t new_object;
|
|
vm_pindex_t new_pindex;
|
|
{
|
|
int s;
|
|
|
|
s = splvm();
|
|
vm_page_remove(m);
|
|
vm_page_insert(m, new_object, new_pindex);
|
|
splx(s);
|
|
}
|
|
|
|
/*
|
|
* vm_page_unqueue without any wakeup
|
|
*/
|
|
void
|
|
vm_page_unqueue_nowakeup(m)
|
|
vm_page_t m;
|
|
{
|
|
int queue = m->queue;
|
|
struct vpgqueues *pq;
|
|
if (queue != PQ_NONE) {
|
|
pq = &vm_page_queues[queue];
|
|
m->queue = PQ_NONE;
|
|
TAILQ_REMOVE(pq->pl, m, pageq);
|
|
--(*pq->cnt);
|
|
--(*pq->lcnt);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* vm_page_unqueue must be called at splhigh();
|
|
*/
|
|
void
|
|
vm_page_unqueue(m)
|
|
vm_page_t m;
|
|
{
|
|
int queue = m->queue;
|
|
struct vpgqueues *pq;
|
|
if (queue != PQ_NONE) {
|
|
m->queue = PQ_NONE;
|
|
pq = &vm_page_queues[queue];
|
|
TAILQ_REMOVE(pq->pl, m, pageq);
|
|
--(*pq->cnt);
|
|
--(*pq->lcnt);
|
|
if ((queue - m->pc) == PQ_CACHE) {
|
|
if ((cnt.v_cache_count + cnt.v_free_count) <
|
|
(cnt.v_free_reserved + cnt.v_cache_min))
|
|
pagedaemon_wakeup();
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Find a page on the specified queue with color optimization.
|
|
*/
|
|
vm_page_t
|
|
vm_page_list_find(basequeue, index)
|
|
int basequeue, index;
|
|
{
|
|
#if PQ_L2_SIZE > 1
|
|
|
|
int i,j;
|
|
vm_page_t m;
|
|
int hindex;
|
|
struct vpgqueues *pq;
|
|
|
|
pq = &vm_page_queues[basequeue];
|
|
|
|
m = TAILQ_FIRST(pq[index].pl);
|
|
if (m)
|
|
return m;
|
|
|
|
for(j = 0; j < PQ_L1_SIZE; j++) {
|
|
int ij;
|
|
for(i = (PQ_L2_SIZE / 2) - PQ_L1_SIZE;
|
|
(ij = i + j) > 0;
|
|
i -= PQ_L1_SIZE) {
|
|
|
|
hindex = index + ij;
|
|
if (hindex >= PQ_L2_SIZE)
|
|
hindex -= PQ_L2_SIZE;
|
|
if (m = TAILQ_FIRST(pq[hindex].pl))
|
|
return m;
|
|
|
|
hindex = index - ij;
|
|
if (hindex < 0)
|
|
hindex += PQ_L2_SIZE;
|
|
if (m = TAILQ_FIRST(pq[hindex].pl))
|
|
return m;
|
|
}
|
|
}
|
|
|
|
hindex = index + PQ_L2_SIZE / 2;
|
|
if (hindex >= PQ_L2_SIZE)
|
|
hindex -= PQ_L2_SIZE;
|
|
m = TAILQ_FIRST(pq[hindex].pl);
|
|
if (m)
|
|
return m;
|
|
|
|
return NULL;
|
|
#else
|
|
return TAILQ_FIRST(vm_page_queues[basequeue].pl);
|
|
#endif
|
|
|
|
}
|
|
|
|
/*
|
|
* Find a page on the specified queue with color optimization.
|
|
*/
|
|
vm_page_t
|
|
vm_page_select(object, pindex, basequeue)
|
|
vm_object_t object;
|
|
vm_pindex_t pindex;
|
|
int basequeue;
|
|
{
|
|
|
|
#if PQ_L2_SIZE > 1
|
|
int index;
|
|
index = (pindex + object->pg_color) & PQ_L2_MASK;
|
|
return vm_page_list_find(basequeue, index);
|
|
|
|
#else
|
|
return TAILQ_FIRST(vm_page_queues[basequeue].pl);
|
|
#endif
|
|
|
|
}
|
|
|
|
/*
|
|
* Find a free or zero page, with specified preference.
|
|
*/
|
|
static vm_page_t
|
|
vm_page_select_free(object, pindex, prefqueue)
|
|
vm_object_t object;
|
|
vm_pindex_t pindex;
|
|
int prefqueue;
|
|
{
|
|
#if PQ_L2_SIZE > 1
|
|
int i,j;
|
|
int index, hindex;
|
|
#endif
|
|
vm_page_t m, mh;
|
|
int oqueuediff;
|
|
struct vpgqueues *pq;
|
|
|
|
if (prefqueue == PQ_ZERO)
|
|
oqueuediff = PQ_FREE - PQ_ZERO;
|
|
else
|
|
oqueuediff = PQ_ZERO - PQ_FREE;
|
|
|
|
if (mh = object->page_hint) {
|
|
if (mh->pindex == (pindex - 1)) {
|
|
if ((mh->flags & PG_FICTITIOUS) == 0) {
|
|
if ((mh < &vm_page_array[cnt.v_page_count-1]) &&
|
|
(mh >= &vm_page_array[0])) {
|
|
int queue;
|
|
m = mh + 1;
|
|
if (VM_PAGE_TO_PHYS(m) == (VM_PAGE_TO_PHYS(mh) + PAGE_SIZE)) {
|
|
queue = m->queue - m->pc;
|
|
if (queue == PQ_FREE || queue == PQ_ZERO) {
|
|
return m;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
pq = &vm_page_queues[prefqueue];
|
|
|
|
#if PQ_L2_SIZE > 1
|
|
|
|
index = (pindex + object->pg_color) & PQ_L2_MASK;
|
|
|
|
if (m = TAILQ_FIRST(pq[index].pl))
|
|
return m;
|
|
if (m = TAILQ_FIRST(pq[index + oqueuediff].pl))
|
|
return m;
|
|
|
|
for(j = 0; j < PQ_L1_SIZE; j++) {
|
|
int ij;
|
|
for(i = (PQ_L2_SIZE / 2) - PQ_L1_SIZE;
|
|
(ij = i + j) >= 0;
|
|
i -= PQ_L1_SIZE) {
|
|
|
|
hindex = index + ij;
|
|
if (hindex >= PQ_L2_SIZE)
|
|
hindex -= PQ_L2_SIZE;
|
|
if (m = TAILQ_FIRST(pq[hindex].pl))
|
|
return m;
|
|
if (m = TAILQ_FIRST(pq[hindex + oqueuediff].pl))
|
|
return m;
|
|
|
|
hindex = index - ij;
|
|
if (hindex < 0)
|
|
hindex += PQ_L2_SIZE;
|
|
if (m = TAILQ_FIRST(pq[hindex].pl))
|
|
return m;
|
|
if (m = TAILQ_FIRST(pq[hindex + oqueuediff].pl))
|
|
return m;
|
|
}
|
|
}
|
|
|
|
hindex = index + PQ_L2_SIZE / 2;
|
|
if (hindex >= PQ_L2_SIZE)
|
|
hindex -= PQ_L2_SIZE;
|
|
if (m = TAILQ_FIRST(pq[hindex].pl))
|
|
return m;
|
|
if (m = TAILQ_FIRST(pq[hindex+oqueuediff].pl))
|
|
return m;
|
|
|
|
#else
|
|
if (m = TAILQ_FIRST(pq[0].pl))
|
|
return m;
|
|
else
|
|
return TAILQ_FIRST(pq[oqueuediff].pl);
|
|
#endif
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* vm_page_alloc:
|
|
*
|
|
* Allocate and return a memory cell associated
|
|
* with this VM object/offset pair.
|
|
*
|
|
* page_req classes:
|
|
* VM_ALLOC_NORMAL normal process request
|
|
* VM_ALLOC_SYSTEM system *really* needs a page
|
|
* VM_ALLOC_INTERRUPT interrupt time request
|
|
* VM_ALLOC_ZERO zero page
|
|
*
|
|
* Object must be locked.
|
|
*/
|
|
vm_page_t
|
|
vm_page_alloc(object, pindex, page_req)
|
|
vm_object_t object;
|
|
vm_pindex_t pindex;
|
|
int page_req;
|
|
{
|
|
register vm_page_t m;
|
|
struct vpgqueues *pq;
|
|
vm_object_t oldobject;
|
|
int queue, qtype;
|
|
int s;
|
|
|
|
#ifdef DIAGNOSTIC
|
|
m = vm_page_lookup(object, pindex);
|
|
if (m)
|
|
panic("vm_page_alloc: page already allocated");
|
|
#endif
|
|
|
|
if ((curproc == pageproc) && (page_req != VM_ALLOC_INTERRUPT)) {
|
|
page_req = VM_ALLOC_SYSTEM;
|
|
};
|
|
|
|
s = splvm();
|
|
|
|
switch (page_req) {
|
|
|
|
case VM_ALLOC_NORMAL:
|
|
if (cnt.v_free_count >= cnt.v_free_reserved) {
|
|
m = vm_page_select_free(object, pindex, PQ_FREE);
|
|
#if defined(DIAGNOSTIC)
|
|
if (m == NULL)
|
|
panic("vm_page_alloc(NORMAL): missing page on free queue\n");
|
|
#endif
|
|
} else {
|
|
m = vm_page_select(object, pindex, PQ_CACHE);
|
|
if (m == NULL) {
|
|
splx(s);
|
|
#if defined(DIAGNOSTIC)
|
|
if (cnt.v_cache_count > 0)
|
|
printf("vm_page_alloc(NORMAL): missing pages on cache queue: %d\n", cnt.v_cache_count);
|
|
#endif
|
|
pagedaemon_wakeup();
|
|
return (NULL);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case VM_ALLOC_ZERO:
|
|
if (cnt.v_free_count >= cnt.v_free_reserved) {
|
|
m = vm_page_select_free(object, pindex, PQ_ZERO);
|
|
#if defined(DIAGNOSTIC)
|
|
if (m == NULL)
|
|
panic("vm_page_alloc(ZERO): missing page on free queue\n");
|
|
#endif
|
|
} else {
|
|
m = vm_page_select(object, pindex, PQ_CACHE);
|
|
if (m == NULL) {
|
|
splx(s);
|
|
#if defined(DIAGNOSTIC)
|
|
if (cnt.v_cache_count > 0)
|
|
printf("vm_page_alloc(ZERO): missing pages on cache queue: %d\n", cnt.v_cache_count);
|
|
#endif
|
|
pagedaemon_wakeup();
|
|
return (NULL);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case VM_ALLOC_SYSTEM:
|
|
if ((cnt.v_free_count >= cnt.v_free_reserved) ||
|
|
((cnt.v_cache_count == 0) &&
|
|
(cnt.v_free_count >= cnt.v_interrupt_free_min))) {
|
|
m = vm_page_select_free(object, pindex, PQ_FREE);
|
|
#if defined(DIAGNOSTIC)
|
|
if (m == NULL)
|
|
panic("vm_page_alloc(SYSTEM): missing page on free queue\n");
|
|
#endif
|
|
} else {
|
|
m = vm_page_select(object, pindex, PQ_CACHE);
|
|
if (m == NULL) {
|
|
splx(s);
|
|
#if defined(DIAGNOSTIC)
|
|
if (cnt.v_cache_count > 0)
|
|
printf("vm_page_alloc(SYSTEM): missing pages on cache queue: %d\n", cnt.v_cache_count);
|
|
#endif
|
|
pagedaemon_wakeup();
|
|
return (NULL);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case VM_ALLOC_INTERRUPT:
|
|
if (cnt.v_free_count > 0) {
|
|
m = vm_page_select_free(object, pindex, PQ_FREE);
|
|
#if defined(DIAGNOSTIC)
|
|
if (m == NULL)
|
|
panic("vm_page_alloc(INTERRUPT): missing page on free queue\n");
|
|
#endif
|
|
} else {
|
|
splx(s);
|
|
pagedaemon_wakeup();
|
|
return (NULL);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
panic("vm_page_alloc: invalid allocation class");
|
|
}
|
|
|
|
queue = m->queue;
|
|
qtype = queue - m->pc;
|
|
if (qtype == PQ_ZERO)
|
|
--vm_page_zero_count;
|
|
pq = &vm_page_queues[queue];
|
|
TAILQ_REMOVE(pq->pl, m, pageq);
|
|
--(*pq->cnt);
|
|
--(*pq->lcnt);
|
|
oldobject = NULL;
|
|
if (qtype == PQ_ZERO) {
|
|
m->flags = PG_ZERO|PG_BUSY;
|
|
} else if (qtype == PQ_CACHE) {
|
|
oldobject = m->object;
|
|
vm_page_remove(m);
|
|
m->flags = PG_BUSY;
|
|
} else {
|
|
m->flags = PG_BUSY;
|
|
}
|
|
m->wire_count = 0;
|
|
m->hold_count = 0;
|
|
m->act_count = 0;
|
|
m->busy = 0;
|
|
m->valid = 0;
|
|
m->dirty = 0;
|
|
m->queue = PQ_NONE;
|
|
|
|
/* XXX before splx until vm_page_insert is safe */
|
|
vm_page_insert(m, object, pindex);
|
|
|
|
splx(s);
|
|
|
|
/*
|
|
* Don't wakeup too often - wakeup the pageout daemon when
|
|
* we would be nearly out of memory.
|
|
*/
|
|
if (((cnt.v_free_count + cnt.v_cache_count) <
|
|
(cnt.v_free_reserved + cnt.v_cache_min)) ||
|
|
(cnt.v_free_count < cnt.v_pageout_free_min))
|
|
pagedaemon_wakeup();
|
|
|
|
s = splvm();
|
|
if ((qtype == PQ_CACHE) &&
|
|
((page_req == VM_ALLOC_NORMAL) || (page_req == VM_ALLOC_ZERO)) &&
|
|
oldobject && (oldobject->type == OBJT_VNODE) &&
|
|
((oldobject->flags & OBJ_DEAD) == 0)) {
|
|
struct vnode *vp;
|
|
vp = (struct vnode *) oldobject->handle;
|
|
if (vp && VSHOULDFREE(vp)) {
|
|
if ((vp->v_flag & (VFREE|VTBFREE|VDOOMED)) == 0) {
|
|
TAILQ_INSERT_TAIL(&vnode_tobefree_list, vp, v_freelist);
|
|
vp->v_flag |= VTBFREE;
|
|
}
|
|
}
|
|
}
|
|
splx(s);
|
|
|
|
return (m);
|
|
}
|
|
|
|
void
|
|
vm_wait()
|
|
{
|
|
int s;
|
|
|
|
s = splvm();
|
|
if (curproc == pageproc) {
|
|
vm_pageout_pages_needed = 1;
|
|
tsleep(&vm_pageout_pages_needed, PSWP, "vmwait", 0);
|
|
} else {
|
|
if (!vm_pages_needed) {
|
|
vm_pages_needed++;
|
|
wakeup(&vm_pages_needed);
|
|
}
|
|
tsleep(&cnt.v_free_count, PVM, "vmwait", 0);
|
|
}
|
|
splx(s);
|
|
}
|
|
|
|
|
|
/*
|
|
* vm_page_activate:
|
|
*
|
|
* Put the specified page on the active list (if appropriate).
|
|
*
|
|
* The page queues must be locked.
|
|
*/
|
|
void
|
|
vm_page_activate(m)
|
|
register vm_page_t m;
|
|
{
|
|
int s;
|
|
|
|
s = splvm();
|
|
if (m->queue == PQ_ACTIVE)
|
|
panic("vm_page_activate: already active");
|
|
|
|
if ((m->queue - m->pc) == PQ_CACHE)
|
|
cnt.v_reactivated++;
|
|
|
|
vm_page_unqueue(m);
|
|
|
|
if (m->wire_count == 0) {
|
|
m->queue = PQ_ACTIVE;
|
|
++(*vm_page_queues[PQ_ACTIVE].lcnt);
|
|
TAILQ_INSERT_TAIL(&vm_page_queue_active, m, pageq);
|
|
if (m->act_count < ACT_INIT)
|
|
m->act_count = ACT_INIT;
|
|
cnt.v_active_count++;
|
|
}
|
|
splx(s);
|
|
}
|
|
|
|
/*
|
|
* helper routine for vm_page_free and vm_page_free_zero
|
|
*/
|
|
static int
|
|
vm_page_freechk_and_unqueue(m)
|
|
vm_page_t m;
|
|
{
|
|
vm_object_t oldobject;
|
|
|
|
oldobject = m->object;
|
|
|
|
#if !defined(MAX_PERF)
|
|
if (m->busy ||
|
|
(m->flags & PG_BUSY) ||
|
|
((m->queue - m->pc) == PQ_FREE) ||
|
|
(m->hold_count != 0)) {
|
|
printf("vm_page_free: pindex(%ld), busy(%d), PG_BUSY(%d), hold(%d)\n",
|
|
m->pindex, m->busy,
|
|
(m->flags & PG_BUSY) ? 1 : 0, m->hold_count);
|
|
if ((m->queue - m->pc) == PQ_FREE)
|
|
panic("vm_page_free: freeing free page");
|
|
else
|
|
panic("vm_page_free: freeing busy page");
|
|
}
|
|
#endif
|
|
|
|
vm_page_remove(m);
|
|
vm_page_unqueue_nowakeup(m);
|
|
if ((m->flags & PG_FICTITIOUS) != 0) {
|
|
return 0;
|
|
}
|
|
if (m->wire_count != 0) {
|
|
if (m->wire_count > 1) {
|
|
panic("vm_page_free: invalid wire count (%d), pindex: 0x%x",
|
|
m->wire_count, m->pindex);
|
|
}
|
|
m->wire_count = 0;
|
|
cnt.v_wire_count--;
|
|
}
|
|
|
|
if (oldobject && (oldobject->type == OBJT_VNODE) &&
|
|
((oldobject->flags & OBJ_DEAD) == 0)) {
|
|
struct vnode *vp;
|
|
vp = (struct vnode *) oldobject->handle;
|
|
if (vp && VSHOULDFREE(vp)) {
|
|
if ((vp->v_flag & (VTBFREE|VDOOMED|VFREE)) == 0) {
|
|
TAILQ_INSERT_TAIL(&vnode_tobefree_list, vp, v_freelist);
|
|
vp->v_flag |= VTBFREE;
|
|
}
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* helper routine for vm_page_free and vm_page_free_zero
|
|
*/
|
|
static __inline void
|
|
vm_page_free_wakeup()
|
|
{
|
|
|
|
/*
|
|
* if pageout daemon needs pages, then tell it that there are
|
|
* some free.
|
|
*/
|
|
if (vm_pageout_pages_needed) {
|
|
wakeup(&vm_pageout_pages_needed);
|
|
vm_pageout_pages_needed = 0;
|
|
}
|
|
/*
|
|
* wakeup processes that are waiting on memory if we hit a
|
|
* high water mark. And wakeup scheduler process if we have
|
|
* lots of memory. this process will swapin processes.
|
|
*/
|
|
if (vm_pages_needed &&
|
|
((cnt.v_free_count + cnt.v_cache_count) >= cnt.v_free_min)) {
|
|
wakeup(&cnt.v_free_count);
|
|
vm_pages_needed = 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* vm_page_free:
|
|
*
|
|
* Returns the given page to the free list,
|
|
* disassociating it with any VM object.
|
|
*
|
|
* Object and page must be locked prior to entry.
|
|
*/
|
|
void
|
|
vm_page_free(m)
|
|
register vm_page_t m;
|
|
{
|
|
int s;
|
|
struct vpgqueues *pq;
|
|
|
|
s = splvm();
|
|
|
|
cnt.v_tfree++;
|
|
|
|
if (!vm_page_freechk_and_unqueue(m)) {
|
|
splx(s);
|
|
return;
|
|
}
|
|
|
|
m->queue = PQ_FREE + m->pc;
|
|
pq = &vm_page_queues[m->queue];
|
|
++(*pq->lcnt);
|
|
++(*pq->cnt);
|
|
/*
|
|
* If the pageout process is grabbing the page, it is likely
|
|
* that the page is NOT in the cache. It is more likely that
|
|
* the page will be partially in the cache if it is being
|
|
* explicitly freed.
|
|
*/
|
|
if (curproc == pageproc) {
|
|
TAILQ_INSERT_TAIL(pq->pl, m, pageq);
|
|
} else {
|
|
TAILQ_INSERT_HEAD(pq->pl, m, pageq);
|
|
}
|
|
|
|
vm_page_free_wakeup();
|
|
splx(s);
|
|
}
|
|
|
|
void
|
|
vm_page_free_zero(m)
|
|
register vm_page_t m;
|
|
{
|
|
int s;
|
|
struct vpgqueues *pq;
|
|
|
|
s = splvm();
|
|
|
|
cnt.v_tfree++;
|
|
|
|
if (!vm_page_freechk_and_unqueue(m)) {
|
|
splx(s);
|
|
return;
|
|
}
|
|
|
|
m->queue = PQ_ZERO + m->pc;
|
|
pq = &vm_page_queues[m->queue];
|
|
++(*pq->lcnt);
|
|
++(*pq->cnt);
|
|
|
|
TAILQ_INSERT_HEAD(pq->pl, m, pageq);
|
|
++vm_page_zero_count;
|
|
vm_page_free_wakeup();
|
|
splx(s);
|
|
}
|
|
|
|
/*
|
|
* vm_page_wire:
|
|
*
|
|
* Mark this page as wired down by yet
|
|
* another map, removing it from paging queues
|
|
* as necessary.
|
|
*
|
|
* The page queues must be locked.
|
|
*/
|
|
void
|
|
vm_page_wire(m)
|
|
register vm_page_t m;
|
|
{
|
|
int s;
|
|
|
|
if (m->wire_count == 0) {
|
|
s = splvm();
|
|
vm_page_unqueue(m);
|
|
splx(s);
|
|
cnt.v_wire_count++;
|
|
}
|
|
++(*vm_page_queues[PQ_NONE].lcnt);
|
|
m->wire_count++;
|
|
m->flags |= PG_MAPPED;
|
|
}
|
|
|
|
/*
|
|
* vm_page_unwire:
|
|
*
|
|
* Release one wiring of this page, potentially
|
|
* enabling it to be paged again.
|
|
*
|
|
* The page queues must be locked.
|
|
*/
|
|
void
|
|
vm_page_unwire(m)
|
|
register vm_page_t m;
|
|
{
|
|
int s;
|
|
|
|
s = splvm();
|
|
|
|
if (m->wire_count > 0)
|
|
m->wire_count--;
|
|
|
|
if (m->wire_count == 0) {
|
|
cnt.v_wire_count--;
|
|
TAILQ_INSERT_TAIL(&vm_page_queue_active, m, pageq);
|
|
m->queue = PQ_ACTIVE;
|
|
++(*vm_page_queues[PQ_ACTIVE].lcnt);
|
|
cnt.v_active_count++;
|
|
}
|
|
splx(s);
|
|
}
|
|
|
|
|
|
/*
|
|
* vm_page_deactivate:
|
|
*
|
|
* Returns the given page to the inactive list,
|
|
* indicating that no physical maps have access
|
|
* to this page. [Used by the physical mapping system.]
|
|
*
|
|
* The page queues must be locked.
|
|
*/
|
|
void
|
|
vm_page_deactivate(m)
|
|
register vm_page_t m;
|
|
{
|
|
int s;
|
|
|
|
/*
|
|
* Only move active pages -- ignore locked or already inactive ones.
|
|
*
|
|
* XXX: sometimes we get pages which aren't wired down or on any queue -
|
|
* we need to put them on the inactive queue also, otherwise we lose
|
|
* track of them. Paul Mackerras (paulus@cs.anu.edu.au) 9-Jan-93.
|
|
*/
|
|
if (m->queue == PQ_INACTIVE)
|
|
return;
|
|
|
|
s = splvm();
|
|
if (m->wire_count == 0 && m->hold_count == 0) {
|
|
if ((m->queue - m->pc) == PQ_CACHE)
|
|
cnt.v_reactivated++;
|
|
vm_page_unqueue(m);
|
|
TAILQ_INSERT_TAIL(&vm_page_queue_inactive, m, pageq);
|
|
m->queue = PQ_INACTIVE;
|
|
++(*vm_page_queues[PQ_INACTIVE].lcnt);
|
|
cnt.v_inactive_count++;
|
|
}
|
|
splx(s);
|
|
}
|
|
|
|
/*
|
|
* vm_page_cache
|
|
*
|
|
* Put the specified page onto the page cache queue (if appropriate).
|
|
*/
|
|
void
|
|
vm_page_cache(m)
|
|
register vm_page_t m;
|
|
{
|
|
int s;
|
|
|
|
if ((m->flags & PG_BUSY) || m->busy || m->wire_count) {
|
|
printf("vm_page_cache: attempting to cache busy page\n");
|
|
return;
|
|
}
|
|
if ((m->queue - m->pc) == PQ_CACHE)
|
|
return;
|
|
|
|
vm_page_protect(m, VM_PROT_NONE);
|
|
if (m->dirty != 0) {
|
|
panic("vm_page_cache: caching a dirty page, pindex: %d", m->pindex);
|
|
}
|
|
s = splvm();
|
|
vm_page_unqueue_nowakeup(m);
|
|
m->queue = PQ_CACHE + m->pc;
|
|
++(*vm_page_queues[m->queue].lcnt);
|
|
TAILQ_INSERT_TAIL(vm_page_queues[m->queue].pl, m, pageq);
|
|
cnt.v_cache_count++;
|
|
vm_page_free_wakeup();
|
|
splx(s);
|
|
}
|
|
|
|
|
|
/*
|
|
* mapping function for valid bits or for dirty bits in
|
|
* a page
|
|
*/
|
|
inline int
|
|
vm_page_bits(int base, int size)
|
|
{
|
|
u_short chunk;
|
|
|
|
if ((base == 0) && (size >= PAGE_SIZE))
|
|
return VM_PAGE_BITS_ALL;
|
|
size = (size + DEV_BSIZE - 1) & ~(DEV_BSIZE - 1);
|
|
base = (base % PAGE_SIZE) / DEV_BSIZE;
|
|
chunk = vm_page_dev_bsize_chunks[size / DEV_BSIZE];
|
|
return (chunk << base) & VM_PAGE_BITS_ALL;
|
|
}
|
|
|
|
/*
|
|
* set a page valid and clean
|
|
*/
|
|
void
|
|
vm_page_set_validclean(m, base, size)
|
|
vm_page_t m;
|
|
int base;
|
|
int size;
|
|
{
|
|
int pagebits = vm_page_bits(base, size);
|
|
m->valid |= pagebits;
|
|
m->dirty &= ~pagebits;
|
|
if( base == 0 && size == PAGE_SIZE)
|
|
pmap_clear_modify(VM_PAGE_TO_PHYS(m));
|
|
}
|
|
|
|
/*
|
|
* set a page (partially) invalid
|
|
*/
|
|
void
|
|
vm_page_set_invalid(m, base, size)
|
|
vm_page_t m;
|
|
int base;
|
|
int size;
|
|
{
|
|
int bits;
|
|
|
|
m->valid &= ~(bits = vm_page_bits(base, size));
|
|
if (m->valid == 0)
|
|
m->dirty &= ~bits;
|
|
}
|
|
|
|
/*
|
|
* is (partial) page valid?
|
|
*/
|
|
int
|
|
vm_page_is_valid(m, base, size)
|
|
vm_page_t m;
|
|
int base;
|
|
int size;
|
|
{
|
|
int bits = vm_page_bits(base, size);
|
|
|
|
if (m->valid && ((m->valid & bits) == bits))
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
vm_page_test_dirty(m)
|
|
vm_page_t m;
|
|
{
|
|
if ((m->dirty != VM_PAGE_BITS_ALL) &&
|
|
pmap_is_modified(VM_PAGE_TO_PHYS(m))) {
|
|
m->dirty = VM_PAGE_BITS_ALL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This interface is for merging with malloc() someday.
|
|
* Even if we never implement compaction so that contiguous allocation
|
|
* works after initialization time, malloc()'s data structures are good
|
|
* for statistics and for allocations of less than a page.
|
|
*/
|
|
void *
|
|
contigmalloc1(size, type, flags, low, high, alignment, boundary, map)
|
|
unsigned long size; /* should be size_t here and for malloc() */
|
|
struct malloc_type *type;
|
|
int flags;
|
|
unsigned long low;
|
|
unsigned long high;
|
|
unsigned long alignment;
|
|
unsigned long boundary;
|
|
vm_map_t map;
|
|
{
|
|
int i, s, start;
|
|
vm_offset_t addr, phys, tmp_addr;
|
|
int pass;
|
|
vm_page_t pga = vm_page_array;
|
|
|
|
size = round_page(size);
|
|
if (size == 0)
|
|
panic("contigmalloc1: size must not be 0");
|
|
if ((alignment & (alignment - 1)) != 0)
|
|
panic("contigmalloc1: alignment must be a power of 2");
|
|
if ((boundary & (boundary - 1)) != 0)
|
|
panic("contigmalloc1: boundary must be a power of 2");
|
|
|
|
start = 0;
|
|
for (pass = 0; pass <= 1; pass++) {
|
|
s = splvm();
|
|
again:
|
|
/*
|
|
* Find first page in array that is free, within range, aligned, and
|
|
* such that the boundary won't be crossed.
|
|
*/
|
|
for (i = start; i < cnt.v_page_count; i++) {
|
|
int pqtype;
|
|
phys = VM_PAGE_TO_PHYS(&pga[i]);
|
|
pqtype = pga[i].queue - pga[i].pc;
|
|
if (((pqtype == PQ_ZERO) || (pqtype == PQ_FREE) || (pqtype == PQ_CACHE)) &&
|
|
(phys >= low) && (phys < high) &&
|
|
((phys & (alignment - 1)) == 0) &&
|
|
(((phys ^ (phys + size - 1)) & ~(boundary - 1)) == 0))
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* If the above failed or we will exceed the upper bound, fail.
|
|
*/
|
|
if ((i == cnt.v_page_count) ||
|
|
((VM_PAGE_TO_PHYS(&pga[i]) + size) > high)) {
|
|
vm_page_t m, next;
|
|
|
|
again1:
|
|
for (m = TAILQ_FIRST(&vm_page_queue_inactive);
|
|
m != NULL;
|
|
m = next) {
|
|
|
|
if (m->queue != PQ_INACTIVE) {
|
|
break;
|
|
}
|
|
|
|
next = TAILQ_NEXT(m, pageq);
|
|
if (m->flags & PG_BUSY) {
|
|
m->flags |= PG_WANTED;
|
|
tsleep(m, PVM, "vpctw0", 0);
|
|
goto again1;
|
|
}
|
|
vm_page_test_dirty(m);
|
|
if (m->dirty) {
|
|
if (m->object->type == OBJT_VNODE) {
|
|
vn_lock(m->object->handle, LK_EXCLUSIVE | LK_RETRY, curproc);
|
|
vm_object_page_clean(m->object, 0, 0, TRUE);
|
|
VOP_UNLOCK(m->object->handle, 0, curproc);
|
|
goto again1;
|
|
} else if (m->object->type == OBJT_SWAP ||
|
|
m->object->type == OBJT_DEFAULT) {
|
|
vm_page_protect(m, VM_PROT_NONE);
|
|
vm_pageout_flush(&m, 1, 0);
|
|
goto again1;
|
|
}
|
|
}
|
|
if ((m->dirty == 0) &&
|
|
(m->busy == 0) &&
|
|
(m->hold_count == 0))
|
|
vm_page_cache(m);
|
|
}
|
|
|
|
for (m = TAILQ_FIRST(&vm_page_queue_active);
|
|
m != NULL;
|
|
m = next) {
|
|
|
|
if (m->queue != PQ_ACTIVE) {
|
|
break;
|
|
}
|
|
|
|
next = TAILQ_NEXT(m, pageq);
|
|
if (m->flags & PG_BUSY) {
|
|
m->flags |= PG_WANTED;
|
|
tsleep(m, PVM, "vpctw1", 0);
|
|
goto again1;
|
|
}
|
|
vm_page_test_dirty(m);
|
|
if (m->dirty) {
|
|
if (m->object->type == OBJT_VNODE) {
|
|
vn_lock(m->object->handle, LK_EXCLUSIVE | LK_RETRY, curproc);
|
|
vm_object_page_clean(m->object, 0, 0, TRUE);
|
|
VOP_UNLOCK(m->object->handle, 0, curproc);
|
|
goto again1;
|
|
} else if (m->object->type == OBJT_SWAP ||
|
|
m->object->type == OBJT_DEFAULT) {
|
|
vm_page_protect(m, VM_PROT_NONE);
|
|
vm_pageout_flush(&m, 1, 0);
|
|
goto again1;
|
|
}
|
|
}
|
|
if ((m->dirty == 0) &&
|
|
(m->busy == 0) &&
|
|
(m->hold_count == 0))
|
|
vm_page_cache(m);
|
|
}
|
|
|
|
splx(s);
|
|
continue;
|
|
}
|
|
start = i;
|
|
|
|
/*
|
|
* Check successive pages for contiguous and free.
|
|
*/
|
|
for (i = start + 1; i < (start + size / PAGE_SIZE); i++) {
|
|
int pqtype;
|
|
pqtype = pga[i].queue - pga[i].pc;
|
|
if ((VM_PAGE_TO_PHYS(&pga[i]) !=
|
|
(VM_PAGE_TO_PHYS(&pga[i - 1]) + PAGE_SIZE)) ||
|
|
((pqtype != PQ_ZERO) && (pqtype != PQ_FREE) && (pqtype != PQ_CACHE))) {
|
|
start++;
|
|
goto again;
|
|
}
|
|
}
|
|
|
|
for (i = start; i < (start + size / PAGE_SIZE); i++) {
|
|
int pqtype;
|
|
vm_page_t m = &pga[i];
|
|
|
|
pqtype = m->queue - m->pc;
|
|
if (pqtype == PQ_CACHE)
|
|
vm_page_free(m);
|
|
|
|
TAILQ_REMOVE(vm_page_queues[m->queue].pl, m, pageq);
|
|
--(*vm_page_queues[m->queue].lcnt);
|
|
cnt.v_free_count--;
|
|
m->valid = VM_PAGE_BITS_ALL;
|
|
m->flags = 0;
|
|
m->dirty = 0;
|
|
m->wire_count = 0;
|
|
m->busy = 0;
|
|
m->queue = PQ_NONE;
|
|
m->object = NULL;
|
|
vm_page_wire(m);
|
|
}
|
|
|
|
/*
|
|
* We've found a contiguous chunk that meets are requirements.
|
|
* Allocate kernel VM, unfree and assign the physical pages to it and
|
|
* return kernel VM pointer.
|
|
*/
|
|
tmp_addr = addr = kmem_alloc_pageable(map, size);
|
|
if (addr == 0) {
|
|
/*
|
|
* XXX We almost never run out of kernel virtual
|
|
* space, so we don't make the allocated memory
|
|
* above available.
|
|
*/
|
|
splx(s);
|
|
return (NULL);
|
|
}
|
|
|
|
for (i = start; i < (start + size / PAGE_SIZE); i++) {
|
|
vm_page_t m = &pga[i];
|
|
vm_page_insert(m, kernel_object,
|
|
OFF_TO_IDX(tmp_addr - VM_MIN_KERNEL_ADDRESS));
|
|
pmap_kenter(tmp_addr, VM_PAGE_TO_PHYS(m));
|
|
tmp_addr += PAGE_SIZE;
|
|
}
|
|
|
|
splx(s);
|
|
return ((void *)addr);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
void *
|
|
contigmalloc(size, type, flags, low, high, alignment, boundary)
|
|
unsigned long size; /* should be size_t here and for malloc() */
|
|
struct malloc_type *type;
|
|
int flags;
|
|
unsigned long low;
|
|
unsigned long high;
|
|
unsigned long alignment;
|
|
unsigned long boundary;
|
|
{
|
|
return contigmalloc1(size, type, flags, low, high, alignment, boundary,
|
|
kernel_map);
|
|
}
|
|
|
|
vm_offset_t
|
|
vm_page_alloc_contig(size, low, high, alignment)
|
|
vm_offset_t size;
|
|
vm_offset_t low;
|
|
vm_offset_t high;
|
|
vm_offset_t alignment;
|
|
{
|
|
return ((vm_offset_t)contigmalloc1(size, M_DEVBUF, M_NOWAIT, low, high,
|
|
alignment, 0ul, kernel_map));
|
|
}
|
|
|
|
#include "opt_ddb.h"
|
|
#ifdef DDB
|
|
#include <sys/kernel.h>
|
|
|
|
#include <ddb/ddb.h>
|
|
|
|
DB_SHOW_COMMAND(page, vm_page_print_page_info)
|
|
{
|
|
db_printf("cnt.v_free_count: %d\n", cnt.v_free_count);
|
|
db_printf("cnt.v_cache_count: %d\n", cnt.v_cache_count);
|
|
db_printf("cnt.v_inactive_count: %d\n", cnt.v_inactive_count);
|
|
db_printf("cnt.v_active_count: %d\n", cnt.v_active_count);
|
|
db_printf("cnt.v_wire_count: %d\n", cnt.v_wire_count);
|
|
db_printf("cnt.v_free_reserved: %d\n", cnt.v_free_reserved);
|
|
db_printf("cnt.v_free_min: %d\n", cnt.v_free_min);
|
|
db_printf("cnt.v_free_target: %d\n", cnt.v_free_target);
|
|
db_printf("cnt.v_cache_min: %d\n", cnt.v_cache_min);
|
|
db_printf("cnt.v_inactive_target: %d\n", cnt.v_inactive_target);
|
|
}
|
|
|
|
DB_SHOW_COMMAND(pageq, vm_page_print_pageq_info)
|
|
{
|
|
int i;
|
|
db_printf("PQ_FREE:");
|
|
for(i=0;i<PQ_L2_SIZE;i++) {
|
|
db_printf(" %d", *vm_page_queues[PQ_FREE + i].lcnt);
|
|
}
|
|
db_printf("\n");
|
|
|
|
db_printf("PQ_CACHE:");
|
|
for(i=0;i<PQ_L2_SIZE;i++) {
|
|
db_printf(" %d", *vm_page_queues[PQ_CACHE + i].lcnt);
|
|
}
|
|
db_printf("\n");
|
|
|
|
db_printf("PQ_ZERO:");
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for(i=0;i<PQ_L2_SIZE;i++) {
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db_printf(" %d", *vm_page_queues[PQ_ZERO + i].lcnt);
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}
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db_printf("\n");
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db_printf("PQ_ACTIVE: %d, PQ_INACTIVE: %d\n",
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*vm_page_queues[PQ_ACTIVE].lcnt,
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*vm_page_queues[PQ_INACTIVE].lcnt);
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}
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#endif /* DDB */
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