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    Subject[patch 2/3] radix-tree: small
    Date
    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 <npiggin@suse.de>

    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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