Imperial-MEng/pintos_22
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feat: implement synchronisation to protecting access to PTEs of SPTs during eviction

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This commit is contained in:
Themis Demetriades
2024-12-05 16:51:15 +00:00
parent e779e8ac7c
commit d03e253046
6 changed files with 114 additions and 45 deletions
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20
src/vm/page.h
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@@ -2,10 +2,12 @@
#define VM_PAGE_H
#include "threads/thread.h"
#include "threads/synch.h"
#include "filesys/off_t.h"
enum page_type {
PAGE_FILE,
PAGE_MMAP,
PAGE_EMPTY
};
@@ -13,6 +15,11 @@ struct page_entry {
enum page_type type; /* Type of Data that should go into the page */
void *upage; /* Start Address of the User Page (Key of hash table). */
/* Data for swapped pages */
struct lock lock; /* Enforces mutual exclusion in accessing the page
referenced by the entry between its owning process
and any thread performing page eviction. */
/* File Data */
struct file *file; /* Pointer to the file for executables. */
off_t offset; /* Offset of the page content within the file. */
@@ -26,15 +33,16 @@ struct page_entry {
unsigned page_hash (const struct hash_elem *e, void *aux);
bool page_less (const struct hash_elem *a_, const struct hash_elem *b_,
void *aux);
struct page_entry *page_insert (struct file *file, off_t ofs, void *upage,
uint32_t read_bytes, uint32_t zero_bytes,
bool writable, enum page_type type);
struct page_entry *page_insert_swapped (void *upage, void* kpage,
struct thread *owner);
struct page_entry *page_insert_file (struct file *file, off_t ofs, void *upage,
uint32_t read_bytes, uint32_t zero_bytes,
bool writable, enum page_type);
struct page_entry *page_get (void *upage);
bool page_load (struct page_entry *page, bool writable);
bool page_load_file (struct page_entry *page, bool writable);
void page_cleanup (struct hash_elem *e, void *aux);
void page_set_swap (struct thread *, void *, size_t);
bool page_in_swap (struct thread *, void *);
size_t page_get_swap (struct thread *, void *);
size_t page_get_swap (struct thread *owner, void *upage);
#endif /* vm/frame.h */