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Bugfixes, enhancements

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- Fixed an important bug with shadow object handling.
  When a shadow is dropped, if there are references left
  to it, both the object in front and dropped object becomes
  a shadow of the original object underneath. We had thought
  of this case but had not increase the shadow count.

- Added a test mechanism that tests the number of objects,
  vmfiles, shadows etc. by first counting them and trying to
  reach the same number by other means, i.e. per-object-shadow counts.
  It discovered a plethora of bugs.

- Added new set of functions to register objects, files and tasks
  globally with the pager, these functions introduce a refcount as
  well as adding structures to linked lists.

- fork/exit now seems to work stably i.e. no negative shadow counts etc.
This commit is contained in:
Bahadir Balban
2008-10-24 13:45:39 +03:00
parent b3693de21b
commit 651901d8b9
13 changed files with 384 additions and 146 deletions
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13
tasks/mm0/include/globals.h Normal file
View File

@@ -0,0 +1,13 @@
#ifndef __GLOBALS_H__
#define __GLOBALS_H__
struct global_list {
int total;
struct list_head list;
};
extern struct global_list global_vm_files;
extern struct global_list global_vm_objects;
extern struct global_list global_tasks;
#endif /* __GLOBALS_H__ */

12
tasks/mm0/include/task.h
View File

@@ -111,8 +111,14 @@ struct task_data_head {
struct task_data tdata[];
};
struct tcb_head {
struct list_head list;
int total; /* Total threads */
};
struct tcb *find_task(int tid);
void task_add_global(struct tcb *t);
void global_add_task(struct tcb *task);
void global_remove_task(struct tcb *task);
int send_task_data(struct tcb *requester);
void task_map_prefault_utcb(struct tcb *mapper, struct tcb *owner);
int task_mmap_regions(struct tcb *task, struct vm_file *file);
@@ -122,8 +128,8 @@ int task_setup_registers(struct tcb *task, unsigned int pc,
unsigned int sp, l4id_t pager);
struct tcb *tcb_alloc_init(unsigned int flags);
int tcb_destroy(struct tcb *task);
int task_exec(struct vm_file *f, unsigned long task_region_start,
unsigned long task_region_end, struct task_ids *ids);
struct tcb *task_exec(struct vm_file *f, unsigned long task_region_start,
unsigned long task_region_end, struct task_ids *ids);
int task_start(struct tcb *task, struct task_ids *ids);
int copy_tcb(struct tcb *to, struct tcb *from, unsigned int flags);
int task_release_vmas(struct task_vma_head *vma_head);

7
tasks/mm0/include/test.h Normal file
View File

@@ -0,0 +1,7 @@
#ifndef __TEST_H__
#define __TEST_H__
int mm0_test_global_vm_integrity(void);
#endif /* __TEST_H__ */

8
tasks/mm0/include/vm_area.h
View File

@@ -223,7 +223,8 @@ struct vm_file *vm_file_create(void);
int vm_file_delete(struct vm_file *f);
int vm_object_delete(struct vm_object *vmo);
void vm_object_print(struct vm_object *vmo);
void vm_object_print1(struct vm_object *vmo);
void vm_print_objects(struct list_head *vmo_list);
void vm_print_files(struct list_head *file_list);
/* Used for pre-faulting a page from mm0 */
int prefault_page(struct tcb *task, unsigned long address,
@@ -249,4 +250,9 @@ int page_fault_handler(struct tcb *faulty_task, fault_kdata_t *fkdata);
int vma_drop_merge_delete(struct vm_area *vma, struct vm_obj_link *link);
int vma_drop_merge_delete_all(struct vm_area *vma);
void global_add_vm_object(struct vm_object *obj);
void global_remove_vm_object(struct vm_object *obj);
void global_add_vm_file(struct vm_file *f);
void global_remove_vm_file(struct vm_file *f);
#endif /* __VM_AREA_H__ */