On Tue, 2010-07-13 at 19:39 +0100, Russell King - ARM Linux wrote: > On Tue, Jul 13, 2010 at 05:02:22PM +0900, KAMEZAWA Hiroyuki wrote: > > How about stop using SPARSEMEM ? What's the benefit ? It just eats up > > memory for mem_section[]. > > The problem with that approach is that sometimes the mem_map array > doesn't fit into any memory banks. > > We've gone around the loop of using flatmem with holes punched in it, > to using discontigmem, and now to using sparsemem. It seems none of > these solutions does what we need for ARM. I guess that's the price > we pay for not having memory architected to be at any particular place > in the physical memory map. What's the ARM hardware's maximum addressable memory these days? 4GB? A 4GB system would have 256 sections, which means 256*2*sizeof(unsigned long) for the mem_section[]. That's a pretty small amount of RAM. What sizes are the holes that are being punched these days? Smaller than 16MB? -- Dave -- 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>