n Thu, 17 Oct 2013, Joonsoo Kim wrote: > To prepare to implement byte sized index for managing the freelist > of a slab, we should restrict the number of objects in a slab to be less > or equal to 256, since byte only represent 256 different values. > Setting the size of object to value equal or more than newly introduced > SLAB_MIN_SIZE ensures that the number of objects in a slab is less or > equal to 256 for a slab with 1 page. Ok so that results in a mininum size object size of 2^(12 - 8) = 2^4 == 16 bytes on x86. This is not true for order 1 pages (which SLAB also supports) where we need 32 bytes. Problems may arise on PPC or IA64 where the page size may be larger than 64K. With 64K we have a mininum size of 2^(16 - 8) = 256 bytes. For those arches we may need 16 bit sized indexes. Maybe make that compile time determined base on page size? > 64KByte results in 16 bit sized indexes? Otherwise I like this approach. Simplifies a lot and its very cache friendly. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>