diff options
| -rw-r--r-- | mm/slub.c | 21 |
1 files changed, 19 insertions, 2 deletions
diff --git a/mm/slub.c b/mm/slub.c index a5832f82234..03ae5490c3d 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -205,6 +205,11 @@ static inline void ClearSlabDebug(struct page *page) #define ARCH_SLAB_MINALIGN __alignof__(unsigned long long) #endif +/* + * The page->inuse field is 16 bit thus we have this limitation + */ +#define MAX_OBJECTS_PER_SLAB 65535 + /* Internal SLUB flags */ #define __OBJECT_POISON 0x80000000 /* Poison object */ @@ -1736,8 +1741,17 @@ static inline int slab_order(int size, int min_objects, { int order; int rem; + int min_order = slub_min_order; - for (order = max(slub_min_order, + /* + * If we would create too many object per slab then reduce + * the slab order even if it goes below slub_min_order. + */ + while (min_order > 0 && + (PAGE_SIZE << min_order) >= MAX_OBJECTS_PER_SLAB * size) + min_order--; + + for (order = max(min_order, fls(min_objects * size - 1) - PAGE_SHIFT); order <= max_order; order++) { @@ -1751,6 +1765,9 @@ static inline int slab_order(int size, int min_objects, if (rem <= slab_size / fract_leftover) break; + /* If the next size is too high then exit now */ + if (slab_size * 2 >= MAX_OBJECTS_PER_SLAB * size) + break; } return order; @@ -2037,7 +2054,7 @@ static int calculate_sizes(struct kmem_cache *s) * The page->inuse field is only 16 bit wide! So we cannot have * more than 64k objects per slab. */ - if (!s->objects || s->objects > 65535) + if (!s->objects || s->objects > MAX_OBJECTS_PER_SLAB) return 0; return 1; |