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- Increase the scope of two vm object locks in vm_object_collapse().

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- Remove the acquisition and release of Giant from vm_object_coalesce().
This commit is contained in:
Alan Cox 2003-11-01 23:06:41 +00:00
parent ceeef1c666
commit 22ec553f77
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=121866
1 changed files with 4 additions and 12 deletions
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16
sys/vm/vm_object.c
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@ -1596,6 +1596,7 @@ vm_object_collapse(vm_object_t object)
);
mtx_unlock(&vm_object_list_mtx);
/* XXX */ VM_OBJECT_LOCK(object);
uma_zfree(obj_zone, backing_object);
object_collapses++;
@ -1619,8 +1620,6 @@ vm_object_collapse(vm_object_t object)
LIST_REMOVE(object, shadow_list);
backing_object->shadow_count--;
backing_object->generation++;
VM_OBJECT_UNLOCK(backing_object);
/* XXX */ VM_OBJECT_UNLOCK(object);
new_backing_object = backing_object->backing_object;
if ((object->backing_object = new_backing_object) != NULL) {
@ -1640,18 +1639,16 @@ vm_object_collapse(vm_object_t object)
/*
* Drop the reference count on backing_object. Since
* its ref_count was at least 2, it will not vanish;
* so we don't need to call vm_object_deallocate, but
* we do anyway.
* its ref_count was at least 2, it will not vanish.
*/
vm_object_deallocate(backing_object);
backing_object->ref_count--;
VM_OBJECT_UNLOCK(backing_object);
object_bypasses++;
}
/*
* Try again with this object's new backing object.
*/
/* XXX */ VM_OBJECT_LOCK(object);
}
}
@ -1754,12 +1751,10 @@ vm_object_coalesce(vm_object_t prev_object, vm_pindex_t prev_pindex,
if (prev_object == NULL)
return (TRUE);
mtx_lock(&Giant);
VM_OBJECT_LOCK(prev_object);
if (prev_object->type != OBJT_DEFAULT &&
prev_object->type != OBJT_SWAP) {
VM_OBJECT_UNLOCK(prev_object);
mtx_unlock(&Giant);
return (FALSE);
}
@ -1775,7 +1770,6 @@ vm_object_coalesce(vm_object_t prev_object, vm_pindex_t prev_pindex,
*/
if (prev_object->backing_object != NULL) {
VM_OBJECT_UNLOCK(prev_object);
mtx_unlock(&Giant);
return (FALSE);
}
@ -1786,7 +1780,6 @@ vm_object_coalesce(vm_object_t prev_object, vm_pindex_t prev_pindex,
if ((prev_object->ref_count > 1) &&
(prev_object->size != next_pindex)) {
VM_OBJECT_UNLOCK(prev_object);
mtx_unlock(&Giant);
return (FALSE);
}
@ -1810,7 +1803,6 @@ vm_object_coalesce(vm_object_t prev_object, vm_pindex_t prev_pindex,
prev_object->size = next_pindex + next_size;
VM_OBJECT_UNLOCK(prev_object);
mtx_unlock(&Giant);
return (TRUE);
}