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o Some improvements to the page coloring of vm objects, particularly,

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for shadow objects.

Submitted by:	bde
This commit is contained in:
Alan Cox 2002-05-06 03:34:17 +00:00
parent 607aa34e88
commit dcc5840ed5
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=96091
1 changed files with 17 additions and 9 deletions
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26
sys/vm/vm_object.c
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@ -146,6 +146,7 @@ extern int vm_pageout_page_count;
static long object_collapses;
static long object_bypasses;
static int next_index;
static uma_zone_t obj_zone;
#define VM_OBJECTS_INIT 256
@ -188,7 +189,6 @@ vm_object_zinit(void *mem, int size)
void
_vm_object_allocate(objtype_t type, vm_size_t size, vm_object_t object)
{
static int next_index;
static int object_hash_rand;
int exp, incr;
@ -201,14 +201,14 @@ _vm_object_allocate(objtype_t type, vm_size_t size, vm_object_t object)
object->flags = 0;
if ((object->type == OBJT_DEFAULT) || (object->type == OBJT_SWAP))
vm_object_set_flag(object, OBJ_ONEMAPPING);
do {
if (size > (PQ_L2_SIZE / 3 + PQ_PRIME1))
incr = PQ_L2_SIZE / 3 + PQ_PRIME1;
else
incr = size;
do
object->pg_color = next_index;
if (size > (PQ_L2_SIZE / 3 + PQ_PRIME1))
incr = PQ_L2_SIZE / 3 + PQ_PRIME1;
else
incr = size;
} while (!atomic_cmpset_int(&next_index, object->pg_color,
(object->pg_color + incr) & PQ_L2_MASK));
while (!atomic_cmpset_int(&next_index, object->pg_color,
(object->pg_color + incr) & PQ_L2_MASK));
object->handle = NULL;
object->backing_object = NULL;
object->backing_object_offset = (vm_ooffset_t) 0;
@ -1144,7 +1144,15 @@ vm_object_shadow(
TAILQ_INSERT_TAIL(&source->shadow_head, result, shadow_list);
source->shadow_count++;
source->generation++;
result->pg_color = (source->pg_color + OFF_TO_IDX(*offset)) & PQ_L2_MASK;
if (length < source->size)
length = source->size;
if (length > PQ_L2_SIZE / 3 + PQ_PRIME1 ||
source->generation > 1)
length = PQ_L2_SIZE / 3 + PQ_PRIME1;
result->pg_color = (source->pg_color +
length * source->generation) & PQ_L2_MASK;
next_index = (result->pg_color + PQ_L2_SIZE / 3 + PQ_PRIME1) &
PQ_L2_MASK;
}
/*