On Tue, Jul 1, 2014 at 12:29 AM, Zhang Zhen <zhenzhang.zhang@xxxxxxxxxx> wrote: > Hi, > > Recently We are testing stable kernel 3.10 on an ARM board. > It failed to boot if we enabled CONFIG_SPARSEMEM config. Arm support 2 sockets and numa now? > 1. In mem_init() and show_mem() compare pfn instead of page just like the patch in attachement. > 2. Enable CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER when enabled CONFIG_SPARSEMEM. > > QUESTION: > > I want to know why CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER depends on x86_64 ? That make memory allocation have less memory hole, from old bootmem bitmap allocation stage. Maybe we don't need that anymore as we have memblock allocation that is more smarter with alignment handling. Also allocating big size and use them block by block, could save some time on searching on allocation function when memblock have lots of entries on memory/reserved arrays. Thanks Yinghai -- 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>