mm/slob: Use object_size field in kmem_cache_size()

Fields object_size and size are not the same: the latter might include
slab metadata. Return object_size field in kmem_cache_size().
Also, improve trace accuracy by correctly tracing reported size.

Cc: Pekka Enberg <penberg@kernel.org>
Cc: Matt Mackall <mpm@selenic.com>
Acked-by: Christoph Lameter <cl@linux.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Ezequiel Garcia <elezegarcia@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

diff --git a/mm/slob.c b/mm/slob.c
index 06a5ec7..287a88a 100644 (file)
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -554,12 +554,12 @@ void *kmem_cache_alloc_node(struct kmem_cache *c, gfp_t flags, int node)
 
        if (c->size < PAGE_SIZE) {
                b = slob_alloc(c->size, flags, c->align, node);
-               trace_kmem_cache_alloc_node(_RET_IP_, b, c->size,
+               trace_kmem_cache_alloc_node(_RET_IP_, b, c->object_size,
                                            SLOB_UNITS(c->size) * SLOB_UNIT,
                                            flags, node);
        } else {
                b = slob_new_pages(flags, get_order(c->size), node);
-               trace_kmem_cache_alloc_node(_RET_IP_, b, c->size,
+               trace_kmem_cache_alloc_node(_RET_IP_, b, c->object_size,
                                            PAGE_SIZE << get_order(c->size),
                                            flags, node);
        }
@@ -606,7 +606,7 @@ EXPORT_SYMBOL(kmem_cache_free);
 
 unsigned int kmem_cache_size(struct kmem_cache *c)
 {
-       return c->size;
+       return c->object_size;
 }
 EXPORT_SYMBOL(kmem_cache_size);