--- zzzz-none-000/linux-3.10.107/Documentation/memory-hotplug.txt 2017-06-27 09:49:32.000000000 +0000 +++ scorpion-7490-727/linux-3.10.107/Documentation/memory-hotplug.txt 2021-02-04 17:41:59.000000000 +0000 @@ -88,16 +88,21 @@ 1.3. Unit of Memory online/offline operation ------------ -Memory hotplug uses SPARSEMEM memory model. SPARSEMEM divides the whole memory -into chunks of the same size. The chunk is called a "section". The size of -a section is architecture dependent. For example, power uses 16MiB, ia64 uses -1GiB. The unit of online/offline operation is "one section". (see Section 3.) +Memory hotplug uses SPARSEMEM memory model which allows memory to be divided +into chunks of the same size. These chunks are called "sections". The size of +a memory section is architecture dependent. For example, power uses 16MiB, ia64 +uses 1GiB. + +Memory sections are combined into chunks referred to as "memory blocks". The +size of a memory block is architecture dependent and represents the logical +unit upon which memory online/offline operations are to be performed. The +default size of a memory block is the same as memory section size unless an +architecture specifies otherwise. (see Section 3.) -To determine the size of sections, please read this file: +To determine the size (in bytes) of a memory block please read this file: /sys/devices/system/memory/block_size_bytes -This file shows the size of sections in byte. ----------------------- 2. Kernel Configuration @@ -123,47 +128,41 @@ (CONFIG_ACPI_CONTAINER). This option can be kernel module too. + -------------------------------- -4 sysfs files for memory hotplug +3 sysfs files for memory hotplug -------------------------------- -All sections have their device information in sysfs. Each section is part of -a memory block under /sys/devices/system/memory as +All memory blocks have their device information in sysfs. Each memory block +is described under /sys/devices/system/memory as /sys/devices/system/memory/memoryXXX -(XXX is the section id.) +(XXX is the memory block id.) -Now, XXX is defined as (start_address_of_section / section_size) of the first -section contained in the memory block. The files 'phys_index' and -'end_phys_index' under each directory report the beginning and end section id's -for the memory block covered by the sysfs directory. It is expected that all +For the memory block covered by the sysfs directory. It is expected that all memory sections in this range are present and no memory holes exist in the range. Currently there is no way to determine if there is a memory hole, but the existence of one should not affect the hotplug capabilities of the memory block. -For example, assume 1GiB section size. A device for a memory starting at +For example, assume 1GiB memory block size. A device for a memory starting at 0x100000000 is /sys/device/system/memory/memory4 (0x100000000 / 1Gib = 4) This device covers address range [0x100000000 ... 0x140000000) -Under each section, you can see 4 or 5 files, the end_phys_index file being -a recent addition and not present on older kernels. +Under each memory block, you can see 5 files: -/sys/devices/system/memory/memoryXXX/start_phys_index -/sys/devices/system/memory/memoryXXX/end_phys_index +/sys/devices/system/memory/memoryXXX/phys_index /sys/devices/system/memory/memoryXXX/phys_device /sys/devices/system/memory/memoryXXX/state /sys/devices/system/memory/memoryXXX/removable +/sys/devices/system/memory/memoryXXX/valid_zones -'phys_index' : read-only and contains section id of the first section - in the memory block, same as XXX. -'end_phys_index' : read-only and contains section id of the last section - in the memory block. +'phys_index' : read-only and contains memory block id, same as XXX. 'state' : read-write at read: contains online/offline state of memory. at write: user can specify "online_kernel", "online_movable", "online", "offline" command - which will be performed on al sections in the block. + which will be performed on all sections in the block. 'phys_device' : read-only: designed to show the name of physical memory device. This is not well implemented now. 'removable' : read-only: contains an integer value indicating @@ -172,6 +171,15 @@ block is removable and a value of 0 indicates that it is not removable. A memory block is removable only if every section in the block is removable. +'valid_zones' : read-only: designed to show which zones this memory block + can be onlined to. + The first column shows it's default zone. + "memory6/valid_zones: Normal Movable" shows this memoryblock + can be onlined to ZONE_NORMAL by default and to ZONE_MOVABLE + by online_movable. + "memory7/valid_zones: Movable Normal" shows this memoryblock + can be onlined to ZONE_MOVABLE by default and to ZONE_NORMAL + by online_kernel. NOTE: These directories/files appear after physical memory hotplug phase. @@ -185,6 +193,7 @@ A backlink will also be created: /sys/devices/system/memory/memory9/node0 -> ../../node/node0 + -------------------------------- 4. Physical memory hot-add phase -------------------------------- @@ -210,13 +219,12 @@ 4.2 Notify memory hot-add event by hand ------------ -In some environments, especially virtualized environment, firmware will not -notify memory hotplug event to the kernel. For such environment, "probe" -interface is supported. This interface depends on CONFIG_ARCH_MEMORY_PROBE. - -Now, CONFIG_ARCH_MEMORY_PROBE is supported only by powerpc but it does not -contain highly architecture codes. Please add config if you need "probe" -interface. +On some architectures, the firmware may not notify the kernel of a memory +hotplug event. Therefore, the memory "probe" interface is supported to +explicitly notify the kernel. This interface depends on +CONFIG_ARCH_MEMORY_PROBE and can be configured on powerpc, sh, and x86 +if hotplug is supported, although for x86 this should be handled by ACPI +notification. Probe interface is located at /sys/devices/system/memory/probe @@ -225,11 +233,10 @@ % echo start_address_of_new_memory > /sys/devices/system/memory/probe -Then, [start_address_of_new_memory, start_address_of_new_memory + section_size) -memory range is hot-added. In this case, hotplug script is not called (in -current implementation). You'll have to online memory by yourself. -Please see "How to online memory" in this text. - +Then, [start_address_of_new_memory, start_address_of_new_memory + +memory_block_size] memory range is hot-added. In this case, hotplug script is +not called (in current implementation). You'll have to online memory by +yourself. Please see "How to online memory" in this text. ------------------------------ @@ -238,36 +245,36 @@ 5.1. State of memory ------------ -To see (online/offline) state of memory section, read 'state' file. +To see (online/offline) state of a memory block, read 'state' file. % cat /sys/device/system/memory/memoryXXX/state -If the memory section is online, you'll read "online". -If the memory section is offline, you'll read "offline". +If the memory block is online, you'll read "online". +If the memory block is offline, you'll read "offline". 5.2. How to online memory ------------ Even if the memory is hot-added, it is not at ready-to-use state. -For using newly added memory, you have to "online" the memory section. +For using newly added memory, you have to "online" the memory block. -For onlining, you have to write "online" to the section's state file as: +For onlining, you have to write "online" to the memory block's state file as: % echo online > /sys/devices/system/memory/memoryXXX/state -This onlining will not change the ZONE type of the target memory section, -If the memory section is in ZONE_NORMAL, you can change it to ZONE_MOVABLE: +This onlining will not change the ZONE type of the target memory block, +If the memory block is in ZONE_NORMAL, you can change it to ZONE_MOVABLE: % echo online_movable > /sys/devices/system/memory/memoryXXX/state -(NOTE: current limit: this memory section must be adjacent to ZONE_MOVABLE) +(NOTE: current limit: this memory block must be adjacent to ZONE_MOVABLE) -And if the memory section is in ZONE_MOVABLE, you can change it to ZONE_NORMAL: +And if the memory block is in ZONE_MOVABLE, you can change it to ZONE_NORMAL: % echo online_kernel > /sys/devices/system/memory/memoryXXX/state -(NOTE: current limit: this memory section must be adjacent to ZONE_NORMAL) +(NOTE: current limit: this memory block must be adjacent to ZONE_NORMAL) -After this, section memoryXXX's state will be 'online' and the amount of +After this, memory block XXX's state will be 'online' and the amount of available memory will be increased. Currently, newly added memory is added as ZONE_NORMAL (for powerpc, ZONE_DMA). @@ -282,22 +289,22 @@ 6.1 Memory offline and ZONE_MOVABLE ------------ Memory offlining is more complicated than memory online. Because memory offline -has to make the whole memory section be unused, memory offline can fail if -the section includes memory which cannot be freed. +has to make the whole memory block be unused, memory offline can fail if +the memory block includes memory which cannot be freed. In general, memory offline can use 2 techniques. -(1) reclaim and free all memory in the section. -(2) migrate all pages in the section. +(1) reclaim and free all memory in the memory block. +(2) migrate all pages in the memory block. In the current implementation, Linux's memory offline uses method (2), freeing -all pages in the section by page migration. But not all pages are +all pages in the memory block by page migration. But not all pages are migratable. Under current Linux, migratable pages are anonymous pages and -page caches. For offlining a section by migration, the kernel has to guarantee -that the section contains only migratable pages. +page caches. For offlining a memory block by migration, the kernel has to +guarantee that the memory block contains only migratable pages. -Now, a boot option for making a section which consists of migratable pages is -supported. By specifying "kernelcore=" or "movablecore=" boot option, you can +Now, a boot option for making a memory block which consists of migratable pages +is supported. By specifying "kernelcore=" or "movablecore=" boot option, you can create ZONE_MOVABLE...a zone which is just used for movable pages. (See also Documentation/kernel-parameters.txt) @@ -313,28 +320,27 @@ Size of memory for movable pages (for offline) is ZZZZ. -Note) Unfortunately, there is no information to show which section belongs +Note: Unfortunately, there is no information to show which memory block belongs to ZONE_MOVABLE. This is TBD. 6.2. How to offline memory ------------ -You can offline a section by using the same sysfs interface that was used in -memory onlining. +You can offline a memory block by using the same sysfs interface that was used +in memory onlining. % echo offline > /sys/devices/system/memory/memoryXXX/state -If offline succeeds, the state of the memory section is changed to be "offline". +If offline succeeds, the state of the memory block is changed to be "offline". If it fails, some error core (like -EBUSY) will be returned by the kernel. -Even if a section does not belong to ZONE_MOVABLE, you can try to offline it. -If it doesn't contain 'unmovable' memory, you'll get success. +Even if a memory block does not belong to ZONE_MOVABLE, you can try to offline +it. If it doesn't contain 'unmovable' memory, you'll get success. -A section under ZONE_MOVABLE is considered to be able to be offlined easily. -But under some busy state, it may return -EBUSY. Even if a memory section -cannot be offlined due to -EBUSY, you can retry offlining it and may be able to -offline it (or not). -(For example, a page is referred to by some kernel internal call and released - soon.) +A memory block under ZONE_MOVABLE is considered to be able to be offlined +easily. But under some busy state, it may return -EBUSY. Even if a memory +block cannot be offlined due to -EBUSY, you can retry offlining it and may be +able to offline it (or not). (For example, a page is referred to by some kernel +internal call and released soon.) Consideration: Memory hotplug's design direction is to make the possibility of memory offlining @@ -353,38 +359,51 @@ -------------------------------- 8. Memory hotplug event notifier -------------------------------- -Memory hotplug has event notifier. There are 6 types of notification. +Hotplugging events are sent to a notification queue. -MEMORY_GOING_ONLINE +There are six types of notification defined in include/linux/memory.h: + +MEM_GOING_ONLINE Generated before new memory becomes available in order to be able to prepare subsystems to handle memory. The page allocator is still unable to allocate from the new memory. -MEMORY_CANCEL_ONLINE +MEM_CANCEL_ONLINE Generated if MEMORY_GOING_ONLINE fails. -MEMORY_ONLINE +MEM_ONLINE Generated when memory has successfully brought online. The callback may allocate pages from the new memory. -MEMORY_GOING_OFFLINE +MEM_GOING_OFFLINE Generated to begin the process of offlining memory. Allocations are no longer possible from the memory but some of the memory to be offlined is still in use. The callback can be used to free memory known to a - subsystem from the indicated memory section. + subsystem from the indicated memory block. -MEMORY_CANCEL_OFFLINE +MEM_CANCEL_OFFLINE Generated if MEMORY_GOING_OFFLINE fails. Memory is available again from - the section that we attempted to offline. + the memory block that we attempted to offline. -MEMORY_OFFLINE +MEM_OFFLINE Generated after offlining memory is complete. -A callback routine can be registered by +A callback routine can be registered by calling + hotplug_memory_notifier(callback_func, priority) -The second argument of callback function (action) is event types of above. -The third argument is passed by pointer of struct memory_notify. +Callback functions with higher values of priority are called before callback +functions with lower values. + +A callback function must have the following prototype: + + int callback_func( + struct notifier_block *self, unsigned long action, void *arg); + +The first argument of the callback function (self) is a pointer to the block +of the notifier chain that points to the callback function itself. +The second argument (action) is one of the event types described above. +The third argument (arg) passes a pointer of struct memory_notify. struct memory_notify { unsigned long start_pfn; @@ -406,13 +425,24 @@ If status_changed_nid* >= 0, callback should create/discard structures for the node if necessary. +The callback routine shall return one of the values +NOTIFY_DONE, NOTIFY_OK, NOTIFY_BAD, NOTIFY_STOP +defined in include/linux/notifier.h + +NOTIFY_DONE and NOTIFY_OK have no effect on the further processing. + +NOTIFY_BAD is used as response to the MEM_GOING_ONLINE, MEM_GOING_OFFLINE, +MEM_ONLINE, or MEM_OFFLINE action to cancel hotplugging. It stops +further processing of the notification queue. + +NOTIFY_STOP stops further processing of the notification queue. + -------------- 9. Future Work -------------- - allowing memory hot-add to ZONE_MOVABLE. maybe we need some switch like sysctl or new control file. - - showing memory section and physical device relationship. - - showing memory section is under ZONE_MOVABLE or not + - showing memory block and physical device relationship. - test and make it better memory offlining. - support HugeTLB page migration and offlining. - memmap removing at memory offline.