> This implements granule page sized vmemmap support for IA64. Christoph,
Your calculations here are all based on a granule size of 16M, but it is possible to configure 64M granules. With current sizeof(struct page) == 56, a 16M page will hold enough page structures for about 4.5G of physical space (assuming 16K pages), so a 64M page would cover 18G. 4.5G is possibly a bit wasteful (for a system with only a handful of GBytes per node, and nodes that are not physically contiguous). 18G is definitely going to result in lots of wasted page structs (that refer to non-existant physical memory around the edges of each node). Maybe a granule is not the right unit of allocation ... perhaps 4M would work better (4M/56 ~= 75000 pages ~= 1.1G)? But if this is too small, then a hard-coded 16M would be better than a granule, because 64M is (IMHO) too big. -Tony P.S. This patch breaks the build for tiger_defconfig, zx1_defconfig etc. But you may have fit on the "grand-unified theory" of mem_map management ... so if the benchmarks come in favourably we could drop all the other CONFIG options. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
