ffline 16-31 no yes * Configure memory echo 1 > /sys/firmware/memory/memory16/config lsmem -o RANGE,SIZE,STATE,BLOCK,CONFIGURED,MEMMAP_ON_MEMORY RANGE SIZE STATE BLOCK CONFIGURED MEMMAP_ON_MEMORY 0x00000000-0x7fffffff 2G online 0-15 yes no 0x80000000-0x87ffffff 128M offline 16 yes yes 0x88000000-0xffffffff 1.9G offline 17-31 no yes * Deconfigure memory echo 0 > /sys/firmware/memory/memory16/config lsmem -o RANGE,SIZE,STATE,BLOCK,CONFIGURED,MEMMAP_ON_MEMORY RANGE SIZE STATE BLOCK CONFIGURED MEMMAP_ON_MEMORY 0x00000000-0x7fffffff 2G online 0-15 yes no 0x80000000-0xffffffff 2G offline 16-31 no yes * Enable memmap_on_memory and online it. (Deconfigure first) echo 0 > /sys/devices/system/memory/memory5/online echo 0 > /sys/firmware/memory/memory5/config lsmem -o RANGE,SIZE,STATE,BLOCK,CONFIGURED,MEMMAP_ON_MEMORY RANGE SIZE STATE BLOCK CONFIGURED MEMMAP_ON_MEMORY 0x00000000-0x27ffffff 640M online 0-4 yes no 0x28000000-0x2fffffff 128M offline 5 no no 0x30000000-0x7fffffff 1.3G online 6-15 yes no 0x80000000-0xffffffff 2G offline 16-31 no yes (Enable memmap_on_memory and online it) echo 1 > /sys/firmware/memory/memory5/memmap_on_memory echo 1 > /sys/firmware/memory/memory5/config echo 1 > /sys/devices/system/memory/memory5/online lsmem -o RANGE,SIZE,STATE,BLOCK,CONFIGURED,MEMMAP_ON_MEMORY RANGE SIZE STATE BLOCK CONFIGURED MEMMAP_ON_MEMORY 0x00000000-0x27ffffff 640M online 0-4 yes no 0x28000000-0x2fffffff 128M online 5 yes yes 0x30000000-0x7fffffff 1.3G online 6-15 yes no 0x80000000-0xffffffff 2G offline 16-31 no yes * Disable memmap_on_memory and online it. (Deconfigure first) echo 0 > /sys/devices/system/memory/memory5/online echo 0 > /sys/firmware/memory/memory5/config lsmem -o RANGE,SIZE,STATE,BLOCK,CONFIGURED,MEMMAP_ON_MEMORY RANGE SIZE STATE BLOCK CONFIGURED MEMMAP_ON_MEMORY 0x00000000-0x27ffffff 640M online 0-4 yes no 0x28000000-0x2fffffff 128M offline 5 no yes 0x30000000-0x7fffffff 1.3G online 6-15 yes no 0x80000000-0xffffffff 2G offline 16-31 no yes (Disable memmap_on_memory and online it) echo 0 > /sys/firmware/memory/memory5/memmap_on_memory echo 1 > /sys/firmware/memory/memory5/config echo 1 > /sys/devices/system/memory/memory5/online lsmem -o RANGE,SIZE,STATE,BLOCK,CONFIGURED,MEMMAP_ON_MEMORY RANGE SIZE STATE BLOCK CONFIGURED MEMMAP_ON_MEMORY 0x00000000-0x7fffffff 2G online 0-15 yes no 0x80000000-0xffffffff 2G offline 16-31 no yes * Userspace changes: lsmem/chmem tool is also changed to use the new interface. I will send it to util-linux soon. Patch 1 adds support for removal of boot-allocated memory blocks. Patch 2 provides option to dynamically configure and deconfigure memory with/without memmap_on_memory. Patch 3 removes MHP_OFFLINE_INACCESSIBLE from s390. The mhp flag was used to mark memory as not accessible until memory hotplug online phase begins. However, with patch 2, it is no longer essential. Memory can be brought to accessible state before adding memory, as the memory is added during runttime now instead of boottime. Patch 4 removes the MEM_PREPARE_ONLINE/MEM_FINISH_OFFLINE notifiers. It is no longer needed. Memory can be brought to accessible state before adding memory now, with runtime (de)configuration of memory. Note: The patches apply to the linux-next branch. v3: Thanks David * Avoid goto label in create_standby_sclp_mems(). * Use unsigned long instead of u64. * Add Acked-by. v2: Thanks David * Rename struct mblock/mblock_arg with struct sclp_mem/sclp_mem_arg. * Rename all mblocks/mblock references with sclp_mems/sclp_mem - structures, functions. * Rename create_online_mblock() with create_configured_sclp_mem(). * Rename config_mblock_show()/config_mblock_store() with config_sclp_mem_show()/config_sclp_mem_store(). * Remove contains_standby_increment() and sclp_mem_notifier. sclp mem state change is performed when adding/removing memory. sclp memory notifier - no longer needed with this patchset. * Recover sclp mem state when add_memory() fails. * Refactor and add function init_sclp_mem(). * Use unsigned long instead of unsigned long long. * Simplify and correct kobj handling. Thanks Heiko. Sumanth Korikkar (4): s390/mm: Support removal of boot-allocated virtual memory map s390/sclp: Add support for dynamic (de)configuration of memory s390/sclp: Remove MHP_OFFLINE_INACCESSIBLE mm/memory_hotplug: Remove MEM_PREPARE_ONLINE/MEM_FINISH_OFFLINE notifiers arch/s390/mm/pgalloc.c | 2 + arch/s390/mm/vmem.c | 21 +-- drivers/base/memory.c | 23 +-- drivers/s390/char/sclp_mem.c | 288 +++++++++++++++++++++++---------- include/linux/memory.h | 9 -- include/linux/memory_hotplug.h | 18 +-- include/linux/memremap.h | 1 - mm/memory_hotplug.c | 17 +- mm/sparse.c | 3 +- 9 files changed, 225 insertions(+), 157 deletions(-) -- 2.48.1[PATCH v3 0/4] Support dynamic (de)configuration of memorySumanth Korikkar undefinedAndrew Morton , David Hildenbrand , linux-mm undefined undefined undefined undefined undefined undefined undefined undefined undefined¾Cƒ‹c