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Change the domain selection policy in kmem_back().

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Ensure that pages backing the same virtual large page come from the
same physical domain, as kmem_malloc_domain() does.

PR:		231038
Reviewed by:	alc, kib
Approved by:	re (gjb)
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D17248
This commit is contained in:
Mark Johnston 2018-09-20 15:45:12 +00:00
parent 51e13c93b6
commit 25ed23cfbb
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=338830
1 changed files with 31 additions and 14 deletions
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45
sys/vm/vm_kern.c
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@ -122,11 +122,12 @@ SYSCTL_ULONG(_vm, OID_AUTO, max_kernel_address, CTLFLAG_RD,
"Max kernel address");
#if VM_NRESERVLEVEL > 0
#define KVA_QUANTUM (1 << (VM_LEVEL_0_ORDER + PAGE_SHIFT))
#define KVA_QUANTUM_SHIFT (VM_LEVEL_0_ORDER + PAGE_SHIFT)
#else
/* On non-superpage architectures want large import sizes. */
#define KVA_QUANTUM (PAGE_SIZE * 1024)
#define KVA_QUANTUM_SHIFT (10 + PAGE_SHIFT)
#endif
#define KVA_QUANTUM (1 << KVA_QUANTUM_SHIFT)
/*
* kva_alloc:
@ -416,9 +417,10 @@ kmem_malloc(vm_size_t size, int flags)
}
/*
* kmem_back:
* kmem_back_domain:
*
* Allocate physical pages for the specified virtual address range.
* Allocate physical pages from the specified domain for the specified
* virtual address range.
*/
int
kmem_back_domain(int domain, vm_object_t object, vm_offset_t addr,
@ -479,24 +481,39 @@ kmem_back_domain(int domain, vm_object_t object, vm_offset_t addr,
return (KERN_SUCCESS);
}
/*
* kmem_back:
*
* Allocate physical pages for the specified virtual address range.
*/
int
kmem_back(vm_object_t object, vm_offset_t addr, vm_size_t size, int flags)
{
struct vm_domainset_iter di;
int domain;
int ret;
vm_offset_t end, next, start;
int domain, rv;
KASSERT(object == kernel_object,
("kmem_back: only supports kernel object."));
vm_domainset_iter_malloc_init(&di, kernel_object, &domain, &flags);
do {
ret = kmem_back_domain(domain, object, addr, size, flags);
if (ret == KERN_SUCCESS)
for (start = addr, end = addr + size; addr < end; addr = next) {
/*
* We must ensure that pages backing a given large virtual page
* all come from the same physical domain.
*/
if (vm_ndomains > 1) {
domain = (addr >> KVA_QUANTUM_SHIFT) % vm_ndomains;
next = roundup2(addr + 1, KVA_QUANTUM);
if (next > end || next < start)
next = end;
} else
next = end;
rv = kmem_back_domain(domain, object, addr, next - addr, flags);
if (rv != KERN_SUCCESS) {
kmem_unback(object, start, addr - start);
break;
} while (vm_domainset_iter_malloc(&di, &domain, &flags) == 0);
return (ret);
}
}
return (rv);
}
/*