Reduce radix tree node memory usage by about a factor of 4 for small
files (< 64K). There are pointer traversal and memory usage costs for
large files with dense pagecache.
Signed-off-by: Nick Piggin <[email protected]>
Index: linux-2.6/lib/radix-tree.c
===================================================================
--- linux-2.6.orig/lib/radix-tree.c
+++ linux-2.6/lib/radix-tree.c
@@ -33,7 +33,7 @@
#ifdef __KERNEL__
-#define RADIX_TREE_MAP_SHIFT 6
+#define RADIX_TREE_MAP_SHIFT (CONFIG_BASE_SMALL ? 4 : 6)
#else
#define RADIX_TREE_MAP_SHIFT 3 /* For more stressful testing */
#endif
-
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