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Mixed changes

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- Adding prefaulting of fs0 to avoid page fault deadlocks.
- Fixed a bug that a vmo page_cache equivalence would simply drop a link to
  an original vmo, even if the vmo could have more pages outside the page cache,
  or if the vmo was not a shadow vmo.
- Fixed a bug with page allocator where recursion would corrupt global variables.
- Now going to fix or re-write a simpler page allocator that works.
This commit is contained in:
Bahadir Balban
2008-09-06 11:15:41 +03:00
parent f6deedff87
commit 6c1da12fec
7 changed files with 164 additions and 25 deletions
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38
tasks/libmem/mm/alloc_page.c
View File

@@ -19,6 +19,7 @@
struct page_allocator allocator;
static struct mem_cache *new_dcache();
static int find_and_free_page_area(void *addr, struct page_allocator *p);
/*
* Allocate a new page area from @area_sources_start. If no areas left,
@@ -63,25 +64,46 @@ get_free_page_area(int quantity, struct page_allocator *p,
if (quantity <= 0)
return 0;
/*
* First, allocate a new area, which may involve recursion.
* If we call this while we touch the global area list, we will
* corrupt it so we call it first.
*/
if (!(new = new_page_area(p, cache_list)))
return 0; /* No more pages */
list_for_each_entry(area, &p->page_area_list, list) {
/* Free but needs dividing */
/* Check for exact size match */
if (area->numpages == quantity && !area->used) {
/* Mark it as used */
area->used = 1;
/*
* We don't need the area we allocated
* earlier, just free it.
*/
BUG_ON(find_and_free_page_area(
(void *)__pfn_to_addr(new->pfn), p) < 0);
return area;
}
if (area->numpages > quantity && !area->used) {
area->numpages -= quantity;
if (!(new = new_page_area(p, cache_list)))
return 0; /* No more pages */
new->pfn = area->pfn + area->numpages;
new->numpages = quantity;
new->used = 1;
INIT_LIST_HEAD(&new->list);
list_add(&new->list, &area->list);
return new;
/* Free and exact size match, no need to divide. */
} else if (area->numpages == quantity && !area->used) {
area->used = 1;
return area;
}
}
/* No more pages */
/*
* No more pages. We could not use the area
* we allocated earlier, just free it.
*/
find_and_free_page_area((void *)__pfn_to_addr(new->pfn), p);
return 0;
}