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In FreeBSD 7.0 and beyond, pmap_growkernel() should pass VM_ALLOC_INTERRUPT

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to vm_page_alloc() instead of VM_ALLOC_SYSTEM.  VM_ALLOC_SYSTEM was the
logical choice before FreeBSD 7.0 because VM_ALLOC_INTERRUPT could not
reclaim a cached page.  Simply put, there was no ordering between
VM_ALLOC_INTERRUPT and VM_ALLOC_SYSTEM as to which "dug deeper" into the
cache and free queues.  Now, there is; VM_ALLOC_INTERRUPT dominates
VM_ALLOC_SYSTEM.

While I'm here, teach pmap_growkernel() to request a prezeroed page.

MFC after:	1 week
This commit is contained in:
Alan Cox 2008-07-07 17:25:09 +00:00
parent 688fe74d0c
commit cc82a18b88
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=180352
2 changed files with 12 additions and 6 deletions
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12
sys/amd64/amd64/pmap.c
View File

@ -1724,10 +1724,12 @@ pmap_growkernel(vm_offset_t addr)
if (pde == NULL) {
/* We need a new PDP entry */
nkpg = vm_page_alloc(NULL, kernel_vm_end >> PDPSHIFT,
VM_ALLOC_NOOBJ | VM_ALLOC_SYSTEM | VM_ALLOC_WIRED);
VM_ALLOC_INTERRUPT | VM_ALLOC_NOOBJ |
VM_ALLOC_WIRED | VM_ALLOC_ZERO);
if (nkpg == NULL)
panic("pmap_growkernel: no memory to grow kernel");
pmap_zero_page(nkpg);
if ((nkpg->flags & PG_ZERO) == 0)
pmap_zero_page(nkpg);
paddr = VM_PAGE_TO_PHYS(nkpg);
newpdp = (pdp_entry_t)
(paddr | PG_V | PG_RW | PG_A | PG_M);
@ -1744,10 +1746,12 @@ pmap_growkernel(vm_offset_t addr)
}
nkpg = vm_page_alloc(NULL, pmap_pde_pindex(kernel_vm_end),
VM_ALLOC_NOOBJ | VM_ALLOC_SYSTEM | VM_ALLOC_WIRED);
VM_ALLOC_INTERRUPT | VM_ALLOC_NOOBJ | VM_ALLOC_WIRED |
VM_ALLOC_ZERO);
if (nkpg == NULL)
panic("pmap_growkernel: no memory to grow kernel");
pmap_zero_page(nkpg);
if ((nkpg->flags & PG_ZERO) == 0)
pmap_zero_page(nkpg);
paddr = VM_PAGE_TO_PHYS(nkpg);
newpdir = (pd_entry_t) (paddr | PG_V | PG_RW | PG_A | PG_M);
*pmap_pde(kernel_pmap, kernel_vm_end) = newpdir;

6
sys/i386/i386/pmap.c
View File

@ -1806,13 +1806,15 @@ pmap_growkernel(vm_offset_t addr)
}
nkpg = vm_page_alloc(NULL, kernel_vm_end >> PDRSHIFT,
VM_ALLOC_NOOBJ | VM_ALLOC_SYSTEM | VM_ALLOC_WIRED);
VM_ALLOC_INTERRUPT | VM_ALLOC_NOOBJ | VM_ALLOC_WIRED |
VM_ALLOC_ZERO);
if (nkpg == NULL)
panic("pmap_growkernel: no memory to grow kernel");
nkpt++;
pmap_zero_page(nkpg);
if ((nkpg->flags & PG_ZERO) == 0)
pmap_zero_page(nkpg);
ptppaddr = VM_PAGE_TO_PHYS(nkpg);
newpdir = (pd_entry_t) (ptppaddr | PG_V | PG_RW | PG_A | PG_M);
pdir_pde(PTD, kernel_vm_end) = newpdir;