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Date: Thu, 21 Aug 2014 17:09:18 +0900
From: Joonsoo Kim <iamjoonsoo.kim@....com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Christoph Lameter <cl@...ux.com>,
Pekka Enberg <penberg@...nel.org>,
David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org,
linux-kernel@...r.kernel.org, Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: [PATCH 1/5] mm/slab_common: move kmem_cache definition to internal header
We don't need to keep kmem_cache definition in include/linux/slab.h
if we don't need to inline kmem_cache_size(). According to my
code inspection, this function is only called at lc_create() in
lib/lru_cache.c which may be called at initialization phase of something,
so we don't need to inline it. Therfore, move it to slab_common.c and
move kmem_cache definition to internal header.
After this change, we can change kmem_cache definition easily without
full kernel build. For instance, we can turn on/off CONFIG_SLUB_STATS
without full kernel build.
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
---
include/linux/slab.h | 42 +-----------------------------------------
mm/slab.h | 33 +++++++++++++++++++++++++++++++++
mm/slab_common.c | 8 ++++++++
3 files changed, 42 insertions(+), 41 deletions(-)
diff --git a/include/linux/slab.h b/include/linux/slab.h
index 1d9abb7..9062e4a 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -158,31 +158,6 @@ size_t ksize(const void *);
#define ARCH_KMALLOC_MINALIGN __alignof__(unsigned long long)
#endif
-#ifdef CONFIG_SLOB
-/*
- * Common fields provided in kmem_cache by all slab allocators
- * This struct is either used directly by the allocator (SLOB)
- * or the allocator must include definitions for all fields
- * provided in kmem_cache_common in their definition of kmem_cache.
- *
- * Once we can do anonymous structs (C11 standard) we could put a
- * anonymous struct definition in these allocators so that the
- * separate allocations in the kmem_cache structure of SLAB and
- * SLUB is no longer needed.
- */
-struct kmem_cache {
- unsigned int object_size;/* The original size of the object */
- unsigned int size; /* The aligned/padded/added on size */
- unsigned int align; /* Alignment as calculated */
- unsigned long flags; /* Active flags on the slab */
- const char *name; /* Slab name for sysfs */
- int refcount; /* Use counter */
- void (*ctor)(void *); /* Called on object slot creation */
- struct list_head list; /* List of all slab caches on the system */
-};
-
-#endif /* CONFIG_SLOB */
-
/*
* Kmalloc array related definitions
*/
@@ -363,14 +338,6 @@ kmem_cache_alloc_node_trace(struct kmem_cache *s,
}
#endif /* CONFIG_TRACING */
-#ifdef CONFIG_SLAB
-#include <linux/slab_def.h>
-#endif
-
-#ifdef CONFIG_SLUB
-#include <linux/slub_def.h>
-#endif
-
extern void *kmalloc_order(size_t size, gfp_t flags, unsigned int order);
#ifdef CONFIG_TRACING
@@ -650,14 +617,7 @@ static inline void *kzalloc_node(size_t size, gfp_t flags, int node)
return kmalloc_node(size, flags | __GFP_ZERO, node);
}
-/*
- * Determine the size of a slab object
- */
-static inline unsigned int kmem_cache_size(struct kmem_cache *s)
-{
- return s->object_size;
-}
-
+unsigned int kmem_cache_size(struct kmem_cache *s);
void __init kmem_cache_init_late(void);
#endif /* _LINUX_SLAB_H */
diff --git a/mm/slab.h b/mm/slab.h
index 0e0fdd3..bd1c54a 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -4,6 +4,39 @@
* Internal slab definitions
*/
+#ifdef CONFIG_SLOB
+/*
+ * Common fields provided in kmem_cache by all slab allocators
+ * This struct is either used directly by the allocator (SLOB)
+ * or the allocator must include definitions for all fields
+ * provided in kmem_cache_common in their definition of kmem_cache.
+ *
+ * Once we can do anonymous structs (C11 standard) we could put a
+ * anonymous struct definition in these allocators so that the
+ * separate allocations in the kmem_cache structure of SLAB and
+ * SLUB is no longer needed.
+ */
+struct kmem_cache {
+ unsigned int object_size;/* The original size of the object */
+ unsigned int size; /* The aligned/padded/added on size */
+ unsigned int align; /* Alignment as calculated */
+ unsigned long flags; /* Active flags on the slab */
+ const char *name; /* Slab name for sysfs */
+ int refcount; /* Use counter */
+ void (*ctor)(void *); /* Called on object slot creation */
+ struct list_head list; /* List of all slab caches on the system */
+};
+
+#endif /* CONFIG_SLOB */
+
+#ifdef CONFIG_SLAB
+#include <linux/slab_def.h>
+#endif
+
+#ifdef CONFIG_SLUB
+#include <linux/slub_def.h>
+#endif
+
/*
* State of the slab allocator.
*
diff --git a/mm/slab_common.c b/mm/slab_common.c
index d319502..2088904 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -30,6 +30,14 @@ LIST_HEAD(slab_caches);
DEFINE_MUTEX(slab_mutex);
struct kmem_cache *kmem_cache;
+/*
+ * Determine the size of a slab object
+ */
+unsigned int kmem_cache_size(struct kmem_cache *s)
+{
+ return s->object_size;
+}
+
#ifdef CONFIG_DEBUG_VM
static int kmem_cache_sanity_check(const char *name, size_t size)
{
--
1.7.9.5
--
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