Slab allocators: define common size limitations

Currently we have a maze of configuration variables that determine the
maximum slab size.  Worst of all it seems to vary between SLAB and SLUB.

So define a common maximum size for kmalloc.  For conveniences sake we use
the maximum size ever supported which is 32 MB.  We limit the maximum size
to a lower limit if MAX_ORDER does not allow such large allocations.

For many architectures this patch will have the effect of adding large
kmalloc sizes.  x86_64 adds 5 new kmalloc sizes.  So a small amount of
memory will be needed for these caches (contemporary SLAB has dynamically
sizeable node and cpu structure so the waste is less than in the past)

Most architectures will then be able to allocate object with sizes up to
MAX_ORDER.  We have had repeated breakage (in fact whenever we doubled the
number of supported processors) on IA64 because one or the other struct
grew beyond what the slab allocators supported.  This will avoid future
issues and f.e.  avoid fixes for 2k and 4k cpu support.

CONFIG_LARGE_ALLOCS is no longer necessary so drop it.

It fixes sparc64 with SLAB.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 32 insertions, 22 deletions

diff --git a/include/linux/kmalloc_sizes.h b/include/linux/kmalloc_sizes.h
index bda23e0..e576b84 100644
--- a/include/linux/kmalloc_sizes.h
+++ b/include/linux/kmalloc_sizes.h
@@ -19,17 +19,27 @@
 	CACHE(32768)
 	CACHE(65536)
 	CACHE(131072)
-#if (NR_CPUS > 512) || (MAX_NUMNODES > 256) || !defined(CONFIG_MMU)
+#if KMALLOC_MAX_SIZE >= 262144
 	CACHE(262144)
 #endif
-#ifndef CONFIG_MMU
+#if KMALLOC_MAX_SIZE >= 524288
 	CACHE(524288)
+#endif
+#if KMALLOC_MAX_SIZE >= 1048576
 	CACHE(1048576)
-#ifdef CONFIG_LARGE_ALLOCS
+#endif
+#if KMALLOC_MAX_SIZE >= 2097152
 	CACHE(2097152)
+#endif
+#if KMALLOC_MAX_SIZE >= 4194304
 	CACHE(4194304)
+#endif
+#if KMALLOC_MAX_SIZE >= 8388608
 	CACHE(8388608)
+#endif
+#if KMALLOC_MAX_SIZE >= 16777216
 	CACHE(16777216)
+#endif
+#if KMALLOC_MAX_SIZE >= 33554432
 	CACHE(33554432)
-#endif /* CONFIG_LARGE_ALLOCS */
-#endif /* CONFIG_MMU */
+#endif
diff --git a/include/linux/slab.h b/include/linux/slab.h
index 6fb2ae2..a015236 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -74,6 +74,21 @@ static inline void *kmem_cache_alloc_node(struct kmem_cache *cachep,
 #endif
 
 /*
+ * The largest kmalloc size supported by the slab allocators is
+ * 32 megabyte (2^25) or the maximum allocatable page order if that is
+ * less than 32 MB.
+ *
+ * WARNING: Its not easy to increase this value since the allocators have
+ * to do various tricks to work around compiler limitations in order to
+ * ensure proper constant folding.
+ */
+#define KMALLOC_SHIFT_HIGH	((MAX_ORDER + PAGE_SHIFT) <= 25 ? \
+				(MAX_ORDER + PAGE_SHIFT) : 25)
+
+#define KMALLOC_MAX_SIZE	(1UL << KMALLOC_SHIFT_HIGH)
+#define KMALLOC_MAX_ORDER	(KMALLOC_SHIFT_HIGH - PAGE_SHIFT)
+
+/*
  * Common kmalloc functions provided by all allocators
  */
 void *__kmalloc(size_t, gfp_t);
diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index a9fb928..0764c82 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -58,17 +58,6 @@ struct kmem_cache {
  */
 #define KMALLOC_SHIFT_LOW 3
 
-#ifdef CONFIG_LARGE_ALLOCS
-#define KMALLOC_SHIFT_HIGH ((MAX_ORDER + PAGE_SHIFT) =< 25 ? \
-				(MAX_ORDER + PAGE_SHIFT - 1) : 25)
-#else
-#if !defined(CONFIG_MMU) || NR_CPUS > 512 || MAX_NUMNODES > 256
-#define KMALLOC_SHIFT_HIGH 20
-#else
-#define KMALLOC_SHIFT_HIGH 18
-#endif
-#endif
-
 /*
  * We keep the general caches in an array of slab caches that are used for
  * 2^x bytes of allocations.
@@ -79,7 +68,7 @@ extern struct kmem_cache kmalloc_caches[KMALLOC_SHIFT_HIGH + 1];
  * Sorry that the following has to be that ugly but some versions of GCC
  * have trouble with constant propagation and loops.
  */
-static inline int kmalloc_index(int size)
+static inline int kmalloc_index(size_t size)
 {
 	/*
 	 * We should return 0 if size == 0 but we use the smallest object
@@ -87,7 +76,7 @@ static inline int kmalloc_index(int size)
 	 */
 	WARN_ON_ONCE(size == 0);
 
-	if (size > (1 << KMALLOC_SHIFT_HIGH))
+	if (size > KMALLOC_MAX_SIZE)
 		return -1;
 
 	if (size > 64 && size <= 96)
@@ -110,17 +99,13 @@ static inline int kmalloc_index(int size)
 	if (size <=  64 * 1024) return 16;
 	if (size <= 128 * 1024) return 17;
 	if (size <= 256 * 1024) return 18;
-#if KMALLOC_SHIFT_HIGH > 18
 	if (size <=  512 * 1024) return 19;
 	if (size <= 1024 * 1024) return 20;
-#endif
-#if KMALLOC_SHIFT_HIGH > 20
 	if (size <=  2 * 1024 * 1024) return 21;
 	if (size <=  4 * 1024 * 1024) return 22;
 	if (size <=  8 * 1024 * 1024) return 23;
 	if (size <= 16 * 1024 * 1024) return 24;
 	if (size <= 32 * 1024 * 1024) return 25;
-#endif
 	return -1;
 
 /*