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Simplify the inner loop of vm_fault()'s delete-behind heuristic.

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Instead of checking each page for PG_UNMANAGED, perform a one-time
check whether the object is OBJT_PHYS.  (PG_UNMANAGED pages only
belong to OBJT_PHYS objects.)
This commit is contained in:
Alan Cox 2008-03-16 17:37:19 +00:00
parent b12455f34e
commit ec96dca788
1 changed files with 2 additions and 2 deletions
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4
sys/vm/vm_fault.c
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@ -484,7 +484,8 @@ RetryFault:;
fs.pindex < fs.entry->lastr + VM_FAULT_READ)) &&
(fs.first_object == fs.object ||
(is_first_object_locked = VM_OBJECT_TRYLOCK(fs.first_object))) &&
fs.first_object->type != OBJT_DEVICE) {
fs.first_object->type != OBJT_DEVICE &&
fs.first_object->type != OBJT_PHYS) {
vm_pindex_t firstpindex, tmppindex;
if (fs.first_pindex < 2 * VM_FAULT_READ)
@ -508,7 +509,6 @@ RetryFault:;
break;
if (mt->busy ||
(mt->oflags & VPO_BUSY) ||
(mt->flags & PG_UNMANAGED) ||
mt->hold_count ||
mt->wire_count)
continue;