kernel: tweak the maximum allocation size to improve memory allocator performance

SVN-Revision: 15130
16 years ago · 9fa8380c9e
parent cf152cff39
commit 9fa8380c9e
1 changed files with 13 additions and 0 deletions
--- a/target/linux/generic-2.6/patches-2.6.28/203-slab_maxsize.patch
+++ b/target/linux/generic-2.6/patches-2.6.28/203-slab_maxsize.patch
@ -0,0 +1,13 @@
+--- a/include/linux/slab.h
+++ b/include/linux/slab.h
+@@ -115,8 +115,8 @@ int kmem_ptr_validate(struct kmem_cache 
+  * to do various tricks to work around compiler limitations in order to
+  * ensure proper constant folding.
+  */
+-#define KMALLOC_SHIFT_HIGH	((MAX_ORDER + PAGE_SHIFT - 1) <= 25 ? \
+-				(MAX_ORDER + PAGE_SHIFT - 1) : 25)
+#define KMALLOC_SHIFT_HIGH	((MAX_ORDER + PAGE_SHIFT - 1) <= 17 ? \
+				(MAX_ORDER + PAGE_SHIFT - 1) : 17)
+ 
+ #define KMALLOC_MAX_SIZE	(1UL << KMALLOC_SHIFT_HIGH)
+ #define KMALLOC_MAX_ORDER	(KMALLOC_SHIFT_HIGH - PAGE_SHIFT)