Checkpoint of a new physical memory backed object type, that does not
have pv_entries. This is intended for very special circumstances, eg: a certain database that has a 1GB shm segment mapped into 300 processes. That would consume 2GB of kvm just to hold the pv_entries alone. This would not be used on systems unless the physical ram was available, as it's not pageable. This is a work-in-progress, but is a useful and functional checkpoint. Matt has got some more fixes for it that will be committed soon. Reviewed by: dillon
This commit is contained in:
parent
bb7df05f67
commit
249645144d
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=60757
@ -880,6 +880,7 @@ ufs/ufs/ufs_vfsops.c standard
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ufs/ufs/ufs_vnops.c standard
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vm/default_pager.c standard
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vm/device_pager.c standard
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vm/phys_pager.c standard
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vm/swap_pager.c standard
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vm/vm_fault.c standard
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vm/vm_glue.c standard
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222
sys/vm/phys_pager.c
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222
sys/vm/phys_pager.c
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@ -0,0 +1,222 @@
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/*
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* Copyright (c) 2000 Peter Wemm
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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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS 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 AUTHORS 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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* $FreeBSD$
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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/linker_set.h>
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#include <sys/conf.h>
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#include <sys/mman.h>
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#include <sys/sysctl.h>
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#include <vm/vm.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_pager.h>
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#include <vm/vm_zone.h>
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static void phys_pager_init __P((void));
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static vm_object_t phys_pager_alloc __P((void *, vm_ooffset_t, vm_prot_t,
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vm_ooffset_t));
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static void phys_pager_dealloc __P((vm_object_t));
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static int phys_pager_getpages __P((vm_object_t, vm_page_t *, int, int));
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static void phys_pager_putpages __P((vm_object_t, vm_page_t *, int,
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boolean_t, int *));
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static boolean_t phys_pager_haspage __P((vm_object_t, vm_pindex_t, int *,
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int *));
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/* list of device pager objects */
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static struct pagerlst phys_pager_object_list;
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static int phys_pager_alloc_lock, phys_pager_alloc_lock_want;
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struct pagerops physpagerops = {
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phys_pager_init,
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phys_pager_alloc,
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phys_pager_dealloc,
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phys_pager_getpages,
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phys_pager_putpages,
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phys_pager_haspage,
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NULL
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};
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static void
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phys_pager_init()
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{
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TAILQ_INIT(&phys_pager_object_list);
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}
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static vm_object_t
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phys_pager_alloc(void *handle, vm_ooffset_t size, vm_prot_t prot,
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vm_ooffset_t foff)
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{
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vm_object_t object;
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/*
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* Offset should be page aligned.
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*/
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if (foff & PAGE_MASK)
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return (NULL);
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size = round_page(size);
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/*
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* Lock to prevent object creation race condition.
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*/
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while (phys_pager_alloc_lock) {
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phys_pager_alloc_lock_want++;
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tsleep(&phys_pager_alloc_lock, PVM, "ppall", 0);
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phys_pager_alloc_lock_want--;
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}
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phys_pager_alloc_lock = 1;
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/*
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* Look up pager, creating as necessary.
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*/
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object = vm_pager_object_lookup(&phys_pager_object_list, handle);
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if (object == NULL) {
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/*
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* Allocate object and associate it with the pager.
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*/
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object = vm_object_allocate(OBJT_PHYS,
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OFF_TO_IDX(foff + size));
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object->handle = handle;
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TAILQ_INIT(&object->un_pager.physp.physp_pglist);
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TAILQ_INSERT_TAIL(&phys_pager_object_list, object,
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pager_object_list);
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} else {
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/*
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* Gain a reference to the object.
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*/
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vm_object_reference(object);
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if (OFF_TO_IDX(foff + size) > object->size)
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object->size = OFF_TO_IDX(foff + size);
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}
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phys_pager_alloc_lock = 0;
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if (phys_pager_alloc_lock_want)
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wakeup(&phys_pager_alloc_lock);
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return (object);
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}
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static void
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phys_pager_dealloc(object)
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vm_object_t object;
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{
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vm_page_t m;
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int s;
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TAILQ_REMOVE(&phys_pager_object_list, object, pager_object_list);
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/*
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* Free up our fake pages.
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*/
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s = splvm();
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while ((m = TAILQ_FIRST(&object->un_pager.physp.physp_pglist)) != 0) {
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TAILQ_REMOVE(&object->un_pager.physp.physp_pglist, m, pageq);
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/* return the page back to normal */
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m->flags &= ~PG_FICTITIOUS;
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m->dirty = 0;
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vm_page_unwire(m, 0);
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vm_page_flag_clear(m, PG_ZERO);
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vm_page_free(m);
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}
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splx(s);
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}
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static int
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phys_pager_getpages(object, m, count, reqpage)
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vm_object_t object;
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vm_page_t *m;
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int count;
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int reqpage;
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{
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int i, s;
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s = splvm();
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/*
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* Fill as many pages as vm_fault has allocated for us.
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*/
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for (i = 0; i < count; i++) {
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if ((m[i]->flags & PG_ZERO) == 0)
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vm_page_zero_fill(m[i]);
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vm_page_flag_set(m[i], PG_ZERO);
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/* Switch off pv_entries */
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vm_page_wire(m[i]);
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vm_page_flag_set(m[i], PG_FICTITIOUS);
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m[i]->valid = VM_PAGE_BITS_ALL;
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m[i]->dirty = 0;
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/* The requested page must remain busy, the others not. */
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if (reqpage != i) {
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vm_page_flag_clear(m[i], PG_BUSY);
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m[i]->busy = 0;
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}
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TAILQ_INSERT_TAIL(&object->un_pager.physp.physp_pglist, m[i],
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pageq);
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}
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splx(s);
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return (VM_PAGER_OK);
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}
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static void
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phys_pager_putpages(object, m, count, sync, rtvals)
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vm_object_t object;
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vm_page_t *m;
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int count;
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boolean_t sync;
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int *rtvals;
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{
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panic("phys_pager_putpage called");
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}
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/*
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* Implement a pretty aggressive clustered getpages strategy. Hint that
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* everything in an entire 4MB window should be prefaulted at once.
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*
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* XXX 4MB (1024 slots per page table page) is convenient for x86,
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* but may not be for other arches.
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*/
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#ifndef PHYSCLUSTER
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#define PHYSCLUSTER 1024
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#endif
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static boolean_t
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phys_pager_haspage(object, pindex, before, after)
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vm_object_t object;
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vm_pindex_t pindex;
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int *before;
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int *after;
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{
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vm_pindex_t base, end;
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base = pindex & (~(PHYSCLUSTER - 1));
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end = base + (PHYSCLUSTER - 1);
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if (before != NULL)
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*before = pindex - base;
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if (after != NULL)
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*after = end - pindex;
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return (TRUE);
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}
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@ -1096,7 +1096,7 @@ vm_mmap(vm_map_t map, vm_offset_t *addr, vm_size_t size, vm_prot_t prot,
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/*
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* Force device mappings to be shared.
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*/
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if (type == OBJT_DEVICE) {
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if (type == OBJT_DEVICE || type == OBJT_PHYS) {
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flags &= ~(MAP_PRIVATE|MAP_COPY);
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flags |= MAP_SHARED;
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}
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#include <sys/queue.h>
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#include <machine/atomic.h>
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enum obj_type { OBJT_DEFAULT, OBJT_SWAP, OBJT_VNODE, OBJT_DEVICE, OBJT_DEAD };
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enum obj_type { OBJT_DEFAULT, OBJT_SWAP, OBJT_VNODE, OBJT_DEVICE, OBJT_PHYS,
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OBJT_DEAD };
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typedef u_char objtype_t;
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/*
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@ -122,6 +123,15 @@ struct vm_object {
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TAILQ_HEAD(, vm_page) devp_pglist;
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} devp;
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/*
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* Physmem pager
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*
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* physp_pglist - list of allocated pages
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*/
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struct {
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TAILQ_HEAD(, vm_page) physp_pglist;
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} physp;
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/*
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* Swap pager
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*
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int remove_mode;
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int s;
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if (object->type == OBJT_DEVICE)
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if (object->type == OBJT_DEVICE || object->type == OBJT_PHYS)
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return;
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while (object) {
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@ -92,6 +92,7 @@ extern struct pagerops defaultpagerops;
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extern struct pagerops swappagerops;
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extern struct pagerops vnodepagerops;
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extern struct pagerops devicepagerops;
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extern struct pagerops physpagerops;
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int cluster_pbuf_freecnt = -1; /* unlimited to begin with */
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@ -173,6 +174,7 @@ struct pagerops *pagertab[] = {
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&swappagerops, /* OBJT_SWAP */
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&vnodepagerops, /* OBJT_VNODE */
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&devicepagerops, /* OBJT_DEVICE */
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&physpagerops, /* OBJT_PHYS */
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&deadpagerops /* OBJT_DEAD */
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};
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