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Introduce vm_page_alloc_noobj_contig()

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This is the same as vm_page_alloc_noobj(), but allocates physically
contiguous runs of memory.  For now it is implemented in terms of
vm_page_alloc_contig(), with the difference that
vm_page_alloc_noobj_contig() implements VM_ALLOC_ZERO by zeroing the
page.

Reviewed by:	alc, kib
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D32005
This commit is contained in:
Mark Johnston 2021-10-19 20:24:21 -04:00
parent a4667e09e6
commit 92db9f3bb7
2 changed files with 49 additions and 0 deletions
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43
sys/vm/vm_page.c
View File

@ -2509,6 +2509,49 @@ vm_page_alloc_noobj_domain(int domain, int req)
return (_vm_page_alloc_noobj_domain(domain, VM_NFREELIST, req));
}
vm_page_t
vm_page_alloc_noobj_contig(int req, u_long npages, vm_paddr_t low,
vm_paddr_t high, u_long alignment, vm_paddr_t boundary,
vm_memattr_t memattr)
{
struct vm_domainset_iter di;
vm_page_t m;
int domain;
vm_domainset_iter_page_init(&di, NULL, 0, &domain, &req);
do {
m = vm_page_alloc_noobj_contig_domain(domain, req, npages, low,
high, alignment, boundary, memattr);
if (m != NULL)
break;
} while (vm_domainset_iter_page(&di, NULL, &domain) == 0);
return (m);
}
vm_page_t
vm_page_alloc_noobj_contig_domain(int domain, int req, u_long npages,
vm_paddr_t low, vm_paddr_t high, u_long alignment, vm_paddr_t boundary,
vm_memattr_t memattr)
{
vm_page_t m;
u_long i;
KASSERT((req & (VM_ALLOC_SBUSY | VM_ALLOC_IGN_SBUSY |
VM_ALLOC_NOOBJ)) == 0,
("%s: invalid req %#x", __func__, req));
m = vm_page_alloc_contig_domain(NULL, 0, domain, req | VM_ALLOC_NOOBJ,
npages, low, high, alignment, boundary, memattr);
if (m != NULL && (req & VM_ALLOC_ZERO) != 0) {
for (i = 0; i < npages; i++) {
if ((m[i].flags & PG_ZERO) == 0)
pmap_zero_page(&m[i]);
}
}
return (m);
}
/*
* Check a page that has been freshly dequeued from a freelist.
*/

6
sys/vm/vm_page.h
View File

@ -616,6 +616,12 @@ vm_page_t vm_page_alloc_freelist(int, int);
vm_page_t vm_page_alloc_freelist_domain(int, int, int);
vm_page_t vm_page_alloc_noobj(int);
vm_page_t vm_page_alloc_noobj_domain(int, int);
vm_page_t vm_page_alloc_noobj_contig(int req, u_long npages, vm_paddr_t low,
vm_paddr_t high, u_long alignment, vm_paddr_t boundary,
vm_memattr_t memattr);
vm_page_t vm_page_alloc_noobj_contig_domain(int domain, int req, u_long npages,
vm_paddr_t low, vm_paddr_t high, u_long alignment, vm_paddr_t boundary,
vm_memattr_t memattr);
void vm_page_bits_set(vm_page_t m, vm_page_bits_t *bits, vm_page_bits_t set);
bool vm_page_blacklist_add(vm_paddr_t pa, bool verbose);
vm_page_t vm_page_grab(vm_object_t, vm_pindex_t, int);