We only want memory block devices for memory to be onlined/offlined
(add/remove from the buddy). This is required so user space can
online/offline memory and kdump gets notified about newly onlined memory.
Let's factor out creation/removal of memory block devices. This helps
to further cleanup arch_add_memory/arch_remove_memory() and to make
implementation of new features easier - especially sub-section
memory hot add from Dan.
Anshuman Khandual is currently working on arch_remove_memory(). I added
a temporary solution via "arm64/mm: Add temporary arch_remove_memory()
implementation", that is sufficient as a firsts tep in the context of
this series. (we don't cleanup page tables in case anything goes
wrong already)
Did a quick sanity test with DIMM plug/unplug, making sure all devices
and sysfs links properly get added/removed. Compile tested on s390x and
x86-64.
Based on next/master.
Next refactoring on my list will be making sure that remove_memory()
will never deal with zones / access "struct pages". Any kind of zone
handling will have to be done when offlining system memory / before
removing device memory. I am thinking about remove_pfn_range_from_zone()",
du undo everything "move_pfn_range_to_zone()" did.
v2 -> v3:
- Add "s390x/mm: Fail when an altmap is used for arch_add_memory()"
- Add "arm64/mm: Add temporary arch_remove_memory() implementation"
- Add "drivers/base/memory: Pass a block_id to init_memory_block()"
- Various changes to "mm/memory_hotplug: Create memory block devices
after arch_add_memory()" and "mm/memory_hotplug: Create memory block
devices after arch_add_memory()" due to switching from sections to
block_id's.
v1 -> v2:
- s390x/mm: Implement arch_remove_memory()
-- remove mapping after "__remove_pages"
David Hildenbrand (11):
mm/memory_hotplug: Simplify and fix check_hotplug_memory_range()
s390x/mm: Fail when an altmap is used for arch_add_memory()
s390x/mm: Implement arch_remove_memory()
arm64/mm: Add temporary arch_remove_memory() implementation
drivers/base/memory: Pass a block_id to init_memory_block()
mm/memory_hotplug: Allow arch_remove_pages() without
CONFIG_MEMORY_HOTREMOVE
mm/memory_hotplug: Create memory block devices after arch_add_memory()
mm/memory_hotplug: Drop MHP_MEMBLOCK_API
mm/memory_hotplug: Remove memory block devices before
arch_remove_memory()
mm/memory_hotplug: Make unregister_memory_block_under_nodes() never
fail
mm/memory_hotplug: Remove "zone" parameter from
sparse_remove_one_section
arch/arm64/mm/mmu.c | 17 +++++
arch/ia64/mm/init.c | 2 -
arch/powerpc/mm/mem.c | 2 -
arch/s390/mm/init.c | 18 +++--
arch/sh/mm/init.c | 2 -
arch/x86/mm/init_32.c | 2 -
arch/x86/mm/init_64.c | 2 -
drivers/base/memory.c | 134 +++++++++++++++++++--------------
drivers/base/node.c | 27 +++----
include/linux/memory.h | 6 +-
include/linux/memory_hotplug.h | 12 +--
include/linux/node.h | 7 +-
mm/memory_hotplug.c | 44 +++++------
mm/sparse.c | 10 +--
14 files changed, 140 insertions(+), 145 deletions(-)
--
2.20.1
