Hi all,
this is a second round of patches to introduce memory hotplug and
hotremove support for arm64. It builds on the work previously published at
[1] and it implements the feedback received in the first round of reviews.
The patchset applies and has been tested on commit bebc6082da0a ("Linux
4.14").
Due to a small regression introduced with commit 8135d8926c08
("mm: memory_hotplug: memory hotremove supports thp migration"), you
will need to appy patch [2] first, until the fix is not upstreamed.
Comments and feedback are gold.
[1] https://lkml.org/lkml/2017/4/11/536
[2] https://lkml.org/lkml/2017/11/20/902
Changes v1->v2:
- swapper pgtable updated in place on hot add, avoiding unnecessary copy
- stop_machine used to updated swapper on hot add, avoiding races
- introduced check on offlining state before hot remove
- new memblock flag used to mark partially unused vmemmap pages, avoiding
the nasty 0xFD hack used in the prev rev (and in x86 hot remove code)
- proper cleaning sequence for p[um]ds,ptes and related TLB management
- Removed macros that changed hot remove behavior based on number
of pgtable levels. Now this is hidden in the pgtable traversal macros.
- Check on the corner case where P[UM]Ds would have to be split during
hot remove: now this is forbidden.
- Minor fixes and refactoring.
Andrea Reale (4):
mm: memory_hotplug: Remove assumption on memory state before hotremove
mm: memory_hotplug: memblock to track partially removed vmemmap mem
mm: memory_hotplug: Add memory hotremove probe device
mm: memory-hotplug: Add memory hot remove support for arm64
Maciej Bielski (1):
mm: memory_hotplug: Memory hotplug (add) support for arm64
arch/arm64/Kconfig | 15 +
arch/arm64/configs/defconfig | 2 +
arch/arm64/include/asm/mmu.h | 7 +
arch/arm64/mm/init.c | 116 ++++++++
arch/arm64/mm/mmu.c | 609 ++++++++++++++++++++++++++++++++++++++++-
drivers/acpi/acpi_memhotplug.c | 2 +-
drivers/base/memory.c | 34 ++-
include/linux/memblock.h | 12 +
include/linux/memory_hotplug.h | 9 +-
mm/memblock.c | 32 +++
mm/memory_hotplug.c | 13 +-
11 files changed, 835 insertions(+), 16 deletions(-)
--
2.7.4
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