Memory hotplug support for arm64 - complete patchset v2
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- v2 Latest5 patches 36 repliesIn review
- v15 patches 11 repliesSuperseded
Changes in v2 from the cover letter
- 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.
Patches in v2 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 2/5 | mm: memory_hotplug: Remove assumption on memory state before hotremovedrivers/ include/ mm/ | +16 | 14 replies | |
| 2/5 | mm: memory_hotplug: Remove assumption on memory state before hotremovedrivers/ include/ mm/ | +16 | 0 replies | |
| 3/5 | mm: memory_hotplug: memblock to track partially removed vmemmap meminclude/ mm/ | +44 | 7 replies | |
| 4/5 | mm: memory_hotplug: Add memory hotremove probe devicedrivers/ | +33 | 11 replies | |
| 5/5 | mm: memory-hotplug: Add memory hot remove support for arm64arch/ arch/ arch/ +2 more | +601 | 0 replies |
Reviews trailers per patch
No Reviewed-by, Acked-by or Tested-by trailers for v2 yet.
Cover letter [PATCH v2 0/5] Memory hotplug support for arm64 - complete patchset v2
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(-)
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