diff options
Diffstat (limited to 'sys/vm/vm_map.c')
| -rw-r--r-- | sys/vm/vm_map.c | 44 |
1 files changed, 30 insertions, 14 deletions
diff --git a/sys/vm/vm_map.c b/sys/vm/vm_map.c index 6b09552c5fee..68dcadd2b2f1 100644 --- a/sys/vm/vm_map.c +++ b/sys/vm/vm_map.c @@ -1620,6 +1620,7 @@ vm_map_insert1(vm_map_t map, vm_object_t object, vm_ooffset_t offset, vm_inherit_t inheritance; u_long bdry; u_int bidx; + int cflags; VM_MAP_ASSERT_LOCKED(map); KASSERT(object != kernel_object || @@ -1696,20 +1697,36 @@ vm_map_insert1(vm_map_t map, vm_object_t object, vm_ooffset_t offset, } cred = NULL; - if ((cow & (MAP_ACC_NO_CHARGE | MAP_NOFAULT | MAP_CREATE_GUARD)) != 0) - goto charged; - if ((cow & MAP_ACC_CHARGED) || ((prot & VM_PROT_WRITE) && - ((protoeflags & MAP_ENTRY_NEEDS_COPY) || object == NULL))) { - if (!(cow & MAP_ACC_CHARGED) && !swap_reserve(end - start)) - return (KERN_RESOURCE_SHORTAGE); - KASSERT(object == NULL || - (protoeflags & MAP_ENTRY_NEEDS_COPY) != 0 || - object->cred == NULL, - ("overcommit: vm_map_insert o %p", object)); - cred = curthread->td_ucred; + if ((cow & (MAP_ACC_NO_CHARGE | MAP_NOFAULT | MAP_CREATE_GUARD)) != 0) { + cflags = OBJCO_NO_CHARGE; + } else { + cflags = 0; + if ((cow & MAP_ACC_CHARGED) != 0 || + ((prot & VM_PROT_WRITE) != 0 && + ((protoeflags & MAP_ENTRY_NEEDS_COPY) != 0 || + object == NULL))) { + if ((cow & MAP_ACC_CHARGED) == 0) { + if (!swap_reserve(end - start)) + return (KERN_RESOURCE_SHORTAGE); + + /* + * Only inform vm_object_coalesce() + * that the object was charged if + * there is no need for CoW, so the + * swap amount reserved is applicable + * to the prev_entry->object. + */ + if ((protoeflags & MAP_ENTRY_NEEDS_COPY) == 0) + cflags |= OBJCO_CHARGED; + } + KASSERT(object == NULL || + (protoeflags & MAP_ENTRY_NEEDS_COPY) != 0 || + object->cred == NULL, + ("overcommit: vm_map_insert o %p", object)); + cred = curthread->td_ucred; + } } -charged: /* Expand the kernel pmap, if necessary. */ if (map == kernel_map && end > kernel_vm_end) { int rv; @@ -1741,8 +1758,7 @@ charged: vm_object_coalesce(prev_entry->object.vm_object, prev_entry->offset, (vm_size_t)(prev_entry->end - prev_entry->start), - (vm_size_t)(end - prev_entry->end), cred != NULL && - (protoeflags & MAP_ENTRY_NEEDS_COPY) == 0)) { + (vm_size_t)(end - prev_entry->end), cflags)) { /* * We were able to extend the object. Determine if we * can extend the previous map entry to include the |