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More updates to vm object handling.

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Added a list of links for vm objects so they can follow
the links that point at them.

More succinct handling of the case where a vm object
is dropped. Now depending on the object's number of link
references and shadow references, upon a drop it could
either be merged, deleted or kept.

Added opener reference count for vm files. Now files
have opener count, objects have shadow and link count.
Link count is also meaningful for how many tasks have
mmap'ed that object.
This commit is contained in:
Bahadir Balban
2008-08-29 12:35:07 +03:00
parent 2217349b60
commit 63e9d059c8
7 changed files with 142 additions and 76 deletions
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26
tasks/mm0/include/vm_area.h
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@@ -121,9 +121,11 @@ struct vm_pager {
*/
struct vm_object {
int npages; /* Number of pages in memory */
int refcnt; /* Number of shadows (or vmas) that refer */
int nlinks; /* Number of mapper links that refer */
int shadows; /* Number of shadows that refer */
struct list_head shref; /* Shadow reference from original object */
struct list_head shadowers; /* List of vm objects that shadows this one */
struct list_head shdw_list; /* List of vm objects that shadows this one */
struct list_head link_list; /* List of links that refer to this object */
struct vm_object *orig_obj; /* Original object that this one shadows */
unsigned int flags; /* Defines the type and flags of the object */
struct list_head list; /* List of all vm objects in memory */
@@ -133,6 +135,7 @@ struct vm_object {
/* In memory representation of either a vfs file, a device. */
struct vm_file {
int openers;
unsigned long length;
unsigned int type;
struct list_head list;
@@ -143,9 +146,28 @@ struct vm_file {
/* To create per-vma vm_object lists */
struct vm_obj_link {
struct list_head list;
struct list_head linkref;
struct vm_object *obj;
};
static inline void vm_link_object(struct vm_obj_link *link, struct vm_object *obj)
{
link->obj = obj;
list_add(&link->linkref, &obj->link_list);
obj->nlinks++;
}
static inline struct vm_object *vm_unlink_object(struct vm_obj_link *link)
{
/* Delete link from object's link list */
list_del(&link->linkref);
/* Reduce object's mapper link count */
link->obj->nlinks--;
return link->obj;
}
#define vm_object_to_file(obj) container_of(obj, struct vm_file, vm_obj)
/*