Hi Wanpeng, On 04/02/2013 06:57 PM, Wanpeng Li wrote: >> >PS. For clarifying calling chains are showed as follows: >> >setup_arch() >> > ... >> > initmem_init() >> > x86_numa_init() >> > numa_init() >> > numa_register_memblks() >> > setup_node_data() >> > NODE_DATA(nid)->node_id = nid; >> > NODE_DATA(nid)->node_start_pfn = start >> PAGE_SHIFT; >> > NODE_DATA(nid)->node_spanned_pages = (end - start) >> PAGE_SHIFT; >> > ... >> > x86_init.paging.pagetable_init() >> > paging_init() >> > ... >> > sparse_init() >> > sparse_early_usemaps_alloc_node() >> > sparse_early_usemaps_alloc_pgdat_section() >> > ___alloc_bootmem_node_nopanic() >> > __alloc_memory_core_early(pgdat->node_id,...) >> > ... >> > zone_sizes_init() >> > free_area_init_nodes() >> > free_area_init_node() >> > pgdat->node_id = nid; >> > pgdat->node_start_pfn = node_start_pfn; >> > calculate_node_totalpages(); >> > pgdat->node_spanned_pages = totalpages; >> > > You miss the nodes which could become online at some point, but not > online currently. Sorry, I'm not quite understanding what you said. I keep node_set_online(nid) there. In boot phase if a node is online now it wil be reinitialized later by zone_sizes_init() else if a node is hotpluged after system is up it will also be initialized by hotadd_new_pgdat() which falls into calling free_area_init_node(). Besides this I'm not sure there are any other dependency besides what you worry about, while I tested this on a x86_64 numa system with hot-add nodes and the meminfo statics looks right before and after hot-add memory. thanks for your patient, linfeng -- 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>