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Introduce pmap_align_superpage(). It increases the starting virtual

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address of the given mapping if a different alignment might result in more
superpage mappings.
This commit is contained in:
Alan Cox 2008-05-09 16:48:07 +00:00
parent e5dc3b75b8
commit d3249b142b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=178875
3 changed files with 48 additions and 0 deletions
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23
sys/amd64/amd64/pmap.c
View File

@ -4469,3 +4469,26 @@ pmap_addr_hint(vm_object_t obj, vm_offset_t addr, vm_size_t size)
addr = (addr + (NBPDR - 1)) & ~(NBPDR - 1);
return addr;
}
/*
* Increase the starting virtual address of the given mapping if a
* different alignment might result in more superpage mappings.
*/
void
pmap_align_superpage(vm_object_t object, vm_ooffset_t offset,
vm_offset_t *addr, vm_size_t size)
{
vm_offset_t superpage_offset;
if (object != NULL && (object->flags & OBJ_COLORED) != 0)
offset += ptoa(object->pg_color);
superpage_offset = offset & PDRMASK;
if (size < superpage_offset ||
size - superpage_offset < NBPDR ||
(*addr & PDRMASK) == superpage_offset)
return;
if ((*addr & PDRMASK) < superpage_offset)
*addr = (*addr & ~PDRMASK) + superpage_offset;
else
*addr = ((*addr + PDRMASK) & ~PDRMASK) + superpage_offset;
}

23
sys/i386/i386/pmap.c
View File

@ -4598,6 +4598,29 @@ pmap_addr_hint(vm_object_t obj, vm_offset_t addr, vm_size_t size)
return addr;
}
/*
* Increase the starting virtual address of the given mapping if a
* different alignment might result in more superpage mappings.
*/
void
pmap_align_superpage(vm_object_t object, vm_ooffset_t offset,
vm_offset_t *addr, vm_size_t size)
{
vm_offset_t superpage_offset;
if (object != NULL && (object->flags & OBJ_COLORED) != 0)
offset += ptoa(object->pg_color);
superpage_offset = offset & PDRMASK;
if (size < superpage_offset ||
size - superpage_offset < NBPDR ||
(*addr & PDRMASK) == superpage_offset)
return;
if ((*addr & PDRMASK) < superpage_offset)
*addr = (*addr & ~PDRMASK) + superpage_offset;
else
*addr = ((*addr + PDRMASK) & ~PDRMASK) + superpage_offset;
}
#if defined(PMAP_DEBUG)
pmap_pid_dump(int pid)

2
sys/vm/pmap.h
View File

@ -90,6 +90,8 @@ struct thread;
*/
extern vm_offset_t kernel_vm_end;
void pmap_align_superpage(vm_object_t, vm_ooffset_t, vm_offset_t *,
vm_size_t);
void pmap_change_wiring(pmap_t, vm_offset_t, boolean_t);
void pmap_clear_modify(vm_page_t m);
void pmap_clear_reference(vm_page_t m);