On Wed, 11 Jun 2014, Zhang Zhen wrote: > Hi, > > Now we can hot-add memory by > > % echo start_address_of_new_memory > /sys/devices/system/memory/probe > > Then, [start_address_of_new_memory, start_address_of_new_memory + > memory_block_size] memory range is hot-added. > > But we can only hot-add *one section one time* by this way. > Whether we can add an argument on behalf of the count of the sections to add ? > So we can can hot-add *several sections one time*. Just like: > Not necessarily true, it depends on sections_per_block. Don't believe Documentation/memory-hotplug.txt that suggests this is only for powerpc, x86 and sh allow this interface as well. > % echo start_address_of_new_memory count_of_sections > /sys/devices/system/memory/probe > > Then, [start_address_of_new_memory, start_address_of_new_memory + > count_of_sections * memory_block_size] memory range is hot-added. > > If this proposal is reasonable, i will send a patch to realize it. > The problem is knowing how much memory is being onlined so that you can definitively determine what count_of_sections should be. The number of pages per memory section depends on PAGE_SIZE and SECTION_SIZE_BITS which differ depending on the architectures that support this interface. So if you support count_of_sections, it would return errno even though you have onlined some sections. -- 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>