Vastly improved contigmalloc routine. It does not solve the
problem of allocating contiguous buffer memory in general, but make it much more likely to work at boot-up time. The best chance for an LKM-type load of a sound driver is immediately after the mount of the root filesystem. This appears to work for a 64K allocation on an 8MB system.
This commit is contained in:
John Dyson
parent
e89054370f
commit
db2c0faa4c
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=19415
222
sys/vm/vm_page.c
222
sys/vm/vm_page.c
@ -34,7 +34,7 @@
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* from: @(#)vm_page.c 7.4 (Berkeley) 5/7/91
|
||||
* $Id: vm_page.c,v 1.68 1996/10/12 20:09:48 bde Exp $
|
||||
* $Id: vm_page.c,v 1.69 1996/10/15 03:16:45 dyson Exp $
|
||||
*/
|
||||
|
||||
/*
|
||||
@ -143,7 +143,7 @@ vm_page_queue_init(void) {
|
||||
}
|
||||
|
||||
vm_page_t vm_page_array;
|
||||
static int vm_page_array_size;
|
||||
int vm_page_array_size;
|
||||
long first_page;
|
||||
static long last_page;
|
||||
static vm_size_t page_mask;
|
||||
@ -1262,6 +1262,7 @@ contigmalloc(size, type, flags, low, high, alignment, boundary)
|
||||
{
|
||||
int i, s, start;
|
||||
vm_offset_t addr, phys, tmp_addr;
|
||||
int pass;
|
||||
vm_page_t pga = vm_page_array;
|
||||
|
||||
size = round_page(size);
|
||||
@ -1273,75 +1274,164 @@ contigmalloc(size, type, flags, low, high, alignment, boundary)
|
||||
panic("vm_page_alloc_contig: boundary must be a power of 2");
|
||||
|
||||
start = 0;
|
||||
s = splvm();
|
||||
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++) {
|
||||
phys = VM_PAGE_TO_PHYS(&pga[i]);
|
||||
if (((pga[i].queue - pga[i].pc) == PQ_FREE) &&
|
||||
(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)) {
|
||||
splx(s);
|
||||
return (NULL);
|
||||
}
|
||||
start = i;
|
||||
|
||||
/*
|
||||
* Check successive pages for contiguous and free.
|
||||
*/
|
||||
for (i = start + 1; i < (start + size / PAGE_SIZE); i++) {
|
||||
if ((VM_PAGE_TO_PHYS(&pga[i]) !=
|
||||
(VM_PAGE_TO_PHYS(&pga[i - 1]) + PAGE_SIZE)) ||
|
||||
((pga[i].queue - pga[i].pc) != PQ_FREE)) {
|
||||
start++;
|
||||
goto 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) {
|
||||
vm_object_page_clean(m->object, 0, 0, TRUE, TRUE);
|
||||
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) {
|
||||
vm_object_page_clean(m->object, 0, 0, TRUE, TRUE);
|
||||
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(kernel_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;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* 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(kernel_map, size);
|
||||
if (addr == 0) {
|
||||
splx(s);
|
||||
return (NULL);
|
||||
return ((void *)addr);
|
||||
}
|
||||
|
||||
for (i = start; i < (start + size / PAGE_SIZE); i++) {
|
||||
vm_page_t m = &pga[i];
|
||||
|
||||
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;
|
||||
vm_page_insert(m, kernel_object,
|
||||
OFF_TO_IDX(tmp_addr - VM_MIN_KERNEL_ADDRESS));
|
||||
vm_page_wire(m);
|
||||
pmap_kenter(tmp_addr, VM_PAGE_TO_PHYS(m));
|
||||
tmp_addr += PAGE_SIZE;
|
||||
}
|
||||
|
||||
splx(s);
|
||||
return ((void *)addr);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
vm_offset_t
|
||||
|
||||
Loading…
Reference in New Issue
Block a user