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-rw-r--r--include/linux/mm_types.h5
-rw-r--r--mm/slub.c54
2 files changed, 38 insertions, 21 deletions
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index af190ce..e0bd223 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -42,7 +42,10 @@ struct page {
* to show when page is mapped
* & limit reverse map searches.
*/
- unsigned int inuse; /* SLUB: Nr of objects */
+ struct { /* SLUB */
+ u16 inuse;
+ u16 objects;
+ };
};
union {
struct {
diff --git a/mm/slub.c b/mm/slub.c
index 64c2b2b..6641025 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -301,7 +301,7 @@ static inline int check_valid_pointer(struct kmem_cache *s,
return 1;
base = page_address(page);
- if (object < base || object >= base + s->objects * s->size ||
+ if (object < base || object >= base + page->objects * s->size ||
(object - base) % s->size) {
return 0;
}
@@ -451,8 +451,8 @@ static void print_tracking(struct kmem_cache *s, void *object)
static void print_page_info(struct page *page)
{
- printk(KERN_ERR "INFO: Slab 0x%p used=%u fp=0x%p flags=0x%04lx\n",
- page, page->inuse, page->freelist, page->flags);
+ printk(KERN_ERR "INFO: Slab 0x%p objects=%u used=%u fp=0x%p flags=0x%04lx\n",
+ page, page->objects, page->inuse, page->freelist, page->flags);
}
@@ -652,6 +652,7 @@ static int check_pad_bytes(struct kmem_cache *s, struct page *page, u8 *p)
p + off, POISON_INUSE, s->size - off);
}
+/* Check the pad bytes at the end of a slab page */
static int slab_pad_check(struct kmem_cache *s, struct page *page)
{
u8 *start;
@@ -664,20 +665,20 @@ static int slab_pad_check(struct kmem_cache *s, struct page *page)
return 1;
start = page_address(page);
- end = start + (PAGE_SIZE << s->order);
- length = s->objects * s->size;
- remainder = end - (start + length);
+ length = (PAGE_SIZE << s->order);
+ end = start + length;
+ remainder = length % s->size;
if (!remainder)
return 1;
- fault = check_bytes(start + length, POISON_INUSE, remainder);
+ fault = check_bytes(end - remainder, POISON_INUSE, remainder);
if (!fault)
return 1;
while (end > fault && end[-1] == POISON_INUSE)
end--;
slab_err(s, page, "Padding overwritten. 0x%p-0x%p", fault, end - 1);
- print_section("Padding", start, length);
+ print_section("Padding", end - remainder, remainder);
restore_bytes(s, "slab padding", POISON_INUSE, start, end);
return 0;
@@ -739,15 +740,24 @@ static int check_object(struct kmem_cache *s, struct page *page,
static int check_slab(struct kmem_cache *s, struct page *page)
{
+ int maxobj;
+
VM_BUG_ON(!irqs_disabled());
if (!PageSlab(page)) {
slab_err(s, page, "Not a valid slab page");
return 0;
}
- if (page->inuse > s->objects) {
+
+ maxobj = (PAGE_SIZE << compound_order(page)) / s->size;
+ if (page->objects > maxobj) {
+ slab_err(s, page, "objects %u > max %u",
+ s->name, page->objects, maxobj);
+ return 0;
+ }
+ if (page->inuse > page->objects) {
slab_err(s, page, "inuse %u > max %u",
- s->name, page->inuse, s->objects);
+ s->name, page->inuse, page->objects);
return 0;
}
/* Slab_pad_check fixes things up after itself */
@@ -765,7 +775,7 @@ static int on_freelist(struct kmem_cache *s, struct page *page, void *search)
void *fp = page->freelist;
void *object = NULL;
- while (fp && nr <= s->objects) {
+ while (fp && nr <= page->objects) {
if (fp == search)
return 1;
if (!check_valid_pointer(s, page, fp)) {
@@ -777,7 +787,7 @@ static int on_freelist(struct kmem_cache *s, struct page *page, void *search)
} else {
slab_err(s, page, "Freepointer corrupt");
page->freelist = NULL;
- page->inuse = s->objects;
+ page->inuse = page->objects;
slab_fix(s, "Freelist cleared");
return 0;
}
@@ -788,10 +798,10 @@ static int on_freelist(struct kmem_cache *s, struct page *page, void *search)
nr++;
}
- if (page->inuse != s->objects - nr) {
+ if (page->inuse != page->objects - nr) {
slab_err(s, page, "Wrong object count. Counter is %d but "
- "counted were %d", page->inuse, s->objects - nr);
- page->inuse = s->objects - nr;
+ "counted were %d", page->inuse, page->objects - nr);
+ page->inuse = page->objects - nr;
slab_fix(s, "Object count adjusted.");
}
return search == NULL;
@@ -910,7 +920,7 @@ bad:
* as used avoids touching the remaining objects.
*/
slab_fix(s, "Marking all objects used");
- page->inuse = s->objects;
+ page->inuse = page->objects;
page->freelist = NULL;
}
return 0;
@@ -1081,6 +1091,7 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node)
if (!page)
return NULL;
+ page->objects = s->objects;
mod_zone_page_state(page_zone(page),
(s->flags & SLAB_RECLAIM_ACCOUNT) ?
NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE,
@@ -1519,7 +1530,7 @@ load_freelist:
goto debug;
c->freelist = object[c->offset];
- c->page->inuse = s->objects;
+ c->page->inuse = c->page->objects;
c->page->freelist = NULL;
c->node = page_to_nid(c->page);
unlock_out:
@@ -1818,6 +1829,9 @@ static inline int slab_order(int size, int min_objects,
int rem;
int min_order = slub_min_order;
+ if ((PAGE_SIZE << min_order) / size > 65535)
+ return get_order(size * 65535) - 1;
+
for (order = max(min_order,
fls(min_objects * size - 1) - PAGE_SHIFT);
order <= max_order; order++) {
@@ -3251,7 +3265,7 @@ static int validate_slab(struct kmem_cache *s, struct page *page,
return 0;
/* Now we know that a valid freelist exists */
- bitmap_zero(map, s->objects);
+ bitmap_zero(map, page->objects);
for_each_free_object(p, s, page->freelist) {
set_bit(slab_index(p, s, addr), map);
@@ -3528,10 +3542,10 @@ static void process_slab(struct loc_track *t, struct kmem_cache *s,
struct page *page, enum track_item alloc)
{
void *addr = page_address(page);
- DECLARE_BITMAP(map, s->objects);
+ DECLARE_BITMAP(map, page->objects);
void *p;
- bitmap_zero(map, s->objects);
+ bitmap_zero(map, page->objects);
for_each_free_object(p, s, page->freelist)
set_bit(slab_index(p, s, addr), map);
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