On Wed 09-06-10 16:45:33, Andrew Morton wrote: > On Fri, 4 Jun 2010 20:40:54 +0200 > Jan Kara <jack@xxxxxxx> wrote: > > > -#define RADIX_TREE_MAX_TAGS 2 > > +#define RADIX_TREE_MAX_TAGS 3 > > Adds another eight bytes to the radix_tree_node, I think. What effect > does this have upon the radix_tree_node_cachep packing for sl[aeiou]b? > Please add to changelog if you can work it out ;). The sizes of structure are: 32-bit: 288 vs 296 64-bit: 552 vs 560 I have now checked (running different kernels because I wasn't sure the computations I do are right) and that gives 7 objects per page with SLAB and SLUB on a 64-bit kernel. I'll try to get also SLOB numbers for 64-bit and possibly numbers for 32-bit archs (although it gets a bit tiring to try all the kernels ;). Honza -- Jan Kara <jack@xxxxxxx> SUSE Labs, CR -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>