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Make the maintenance of a page's valid bits by contigmalloc() more like

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kmem_alloc() and kmem_malloc().  Specifically, defer the setting of the
page's valid bits until contigmapping() when the mapping is known to be
successful.
This commit is contained in:
Alan Cox 2009-06-17 04:57:32 +00:00
parent 615f88eca6
commit ead1d027bd
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=194331
2 changed files with 6 additions and 3 deletions
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1
sys/vm/vm_contig.c
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@ -218,6 +218,7 @@ contigmapping(vm_page_t m, vm_pindex_t npages, int flags)
OFF_TO_IDX(tmp_addr - VM_MIN_KERNEL_ADDRESS));
if ((flags & M_ZERO) && !(m[i].flags & PG_ZERO))
pmap_zero_page(&m[i]);
m[i].valid = VM_PAGE_BITS_ALL;
tmp_addr += PAGE_SIZE;
}
VM_OBJECT_UNLOCK(object);

8
sys/vm/vm_phys.c
View File

@ -691,14 +691,16 @@ vm_phys_alloc_contig(unsigned long npages, vm_paddr_t low, vm_paddr_t high,
("vm_phys_alloc_contig: page %p has unexpected queue %d",
m, m->queue));
m_object = m->object;
if ((m->flags & PG_CACHED) != 0)
if ((m->flags & PG_CACHED) != 0) {
m->valid = 0;
vm_page_cache_remove(m);
else {
} else {
KASSERT(VM_PAGE_IS_FREE(m),
("vm_phys_alloc_contig: page %p is not free", m));
KASSERT(m->valid == 0,
("vm_phys_alloc_contig: free page %p is valid", m));
cnt.v_free_count--;
}
m->valid = VM_PAGE_BITS_ALL;
if (m->flags & PG_ZERO)
vm_page_zero_count--;
/* Don't clear the PG_ZERO flag; we'll need it later. */