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Be more aggressive in using superpages in all mappings of objects:

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- Add a new address space allocation method (VMFS_OPTIMAL_SPACE) for
  vm_map_find() that will try to alter the alignment of a mapping to match
  any existing superpage mappings of the object being mapped.  If no
  suitable address range is found with the necessary alignment,
  vm_map_find() will fall back to using the simple first-fit strategy
  (VMFS_ANY_SPACE).
- Change mmap() without MAP_FIXED, shmat(), and the GEM mapping ioctl to
  use VMFS_OPTIMAL_SPACE instead of VMFS_ANY_SPACE.

Reviewed by:	alc (earlier version)
MFC after:	2 weeks
This commit is contained in:
John Baldwin 2013-07-19 19:06:15 +00:00
parent 748e404f26
commit ff74a3fa6b
5 changed files with 22 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
sys/dev/drm2/i915/i915_gem.c
View File

@ -1289,7 +1289,7 @@ i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
vm_object_reference(obj->vm_obj);
DRM_UNLOCK(dev);
rv = vm_map_find(map, obj->vm_obj, args->offset, &addr, args->size,
VMFS_ANY_SPACE, VM_PROT_READ | VM_PROT_WRITE,
VMFS_OPTIMAL_SPACE, VM_PROT_READ | VM_PROT_WRITE,
VM_PROT_READ | VM_PROT_WRITE, MAP_SHARED);
if (rv != KERN_SUCCESS) {
vm_object_deallocate(obj->vm_obj);

2
sys/kern/sysv_shm.c
View File

@ -414,7 +414,7 @@ kern_shmat(td, shmid, shmaddr, shmflg)
vm_object_reference(shmseg->object);
rv = vm_map_find(&p->p_vmspace->vm_map, shmseg->object,
0, &attach_va, size, (flags & MAP_FIXED) ? VMFS_NO_SPACE :
VMFS_ANY_SPACE, prot, prot, MAP_INHERIT_SHARE);
VMFS_OPTIMAL_SPACE, prot, prot, MAP_INHERIT_SHARE);
if (rv != KERN_SUCCESS) {
vm_object_deallocate(shmseg->object);
error = ENOMEM;

20
sys/vm/vm_map.c
View File

@ -1444,19 +1444,29 @@ vm_map_find(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
vm_size_t length, int find_space, vm_prot_t prot,
vm_prot_t max, int cow)
{
vm_offset_t start;
vm_offset_t start, initial_addr;
int result;
start = *addr;
if (find_space == VMFS_OPTIMAL_SPACE && (object == NULL ||
(object->flags & OBJ_COLORED) == 0))
find_space = VMFS_ANY_SPACE;
initial_addr = *addr;
again:
start = initial_addr;
vm_map_lock(map);
do {
if (find_space != VMFS_NO_SPACE) {
if (vm_map_findspace(map, start, length, addr)) {
vm_map_unlock(map);
if (find_space == VMFS_OPTIMAL_SPACE) {
find_space = VMFS_ANY_SPACE;
goto again;
}
return (KERN_NO_SPACE);
}
switch (find_space) {
case VMFS_ALIGNED_SPACE:
case VMFS_OPTIMAL_SPACE:
pmap_align_superpage(object, offset, addr,
length);
break;
@ -1473,11 +1483,11 @@ vm_map_find(vm_map_t map, vm_object_t object, vm_ooffset_t offset,
}
result = vm_map_insert(map, object, offset, start, start +
length, prot, max, cow);
} while (result == KERN_NO_SPACE && (find_space == VMFS_ALIGNED_SPACE
} while (result == KERN_NO_SPACE && (find_space == VMFS_ALIGNED_SPACE ||
#ifdef VMFS_TLB_ALIGNED_SPACE
|| find_space == VMFS_TLB_ALIGNED_SPACE
find_space == VMFS_TLB_ALIGNED_SPACE ||
#endif
));
find_space == VMFS_OPTIMAL_SPACE));
vm_map_unlock(map);
return (result);
}

5
sys/vm/vm_map.h
View File

@ -343,9 +343,10 @@ long vmspace_resident_count(struct vmspace *vmspace);
*/
#define VMFS_NO_SPACE 0 /* don't find; use the given range */
#define VMFS_ANY_SPACE 1 /* find a range with any alignment */
#define VMFS_ALIGNED_SPACE 2 /* find a superpage-aligned range */
#define VMFS_OPTIMAL_SPACE 2 /* find a range with optimal alignment*/
#define VMFS_ALIGNED_SPACE 3 /* find a superpage-aligned range */
#if defined(__mips__)
#define VMFS_TLB_ALIGNED_SPACE 3 /* find a TLB entry aligned range */
#define VMFS_TLB_ALIGNED_SPACE 4 /* find a TLB entry aligned range */
#endif
/*

3
sys/vm/vm_mmap.c
View File

@ -1603,7 +1603,8 @@ vm_mmap(vm_map_t map, vm_offset_t *addr, vm_size_t size, vm_prot_t prot,
else if (fitit)
rv = vm_map_find(map, object, foff, addr, size,
object != NULL && object->type == OBJT_DEVICE ?
VMFS_ALIGNED_SPACE : VMFS_ANY_SPACE, prot, maxprot, docow);
VMFS_ALIGNED_SPACE : VMFS_OPTIMAL_SPACE, prot, maxprot,
docow);
else
rv = vm_map_fixed(map, object, foff, *addr, size,
prot, maxprot, docow);