Hi All,
The patch series implements "memmap on memory" feature on s390.
Patch 1 introduces new mhp_flag MHP_OFFLINE_INACCESSIBLE to mark
memory as not accessible until memory hotplug online phase begins.
Patch 2 avoids page_init_poison() on memmap during mhp addition phase,
when mhp_flag MHP_OFFLINE_INACCESSIBLE is passed over from add_memory()
Patch 3 introduces MEM_PREPARE_ONLINE/MEM_FINISH_OFFLINE memory
notifiers to prepare the transition of memory to and from a physically
accessible state. This enhancement is crucial for implementing the
"memmap on memory" feature for s390 in a subsequent patch.
Patches 4 allocates vmemmap pages from self-contained memory range for
s390. It allocates memory map (struct pages array) from the hotplugged
memory range, rather than using system memory by passing altmap to
vmemmap functions.
Patch 5 removes unhandled memory notifier types on s390.
Patch 6 implements MEM_PREPARE_ONLINE/MEM_FINISH_OFFLINE memory
notifiers on s390. MEM_PREPARE_ONLINE memory notifier makes memory block
physical accessible via sclp assign command. The notifier ensures
self-contained memory maps are accessible and hence enabling the "memmap
on memory" on s390. MEM_FINISH_OFFLINE memory notifier shifts the memory
block to an inaccessible state via sclp unassign command
Patch 7 finally enables MHP_MEMMAP_ON_MEMORY on s390
These patches are rebased on top of three fixes:
mm: use vmem_altmap code without CONFIG_ZONE_DEVICE
mm/memory_hotplug: fix error handling in add_memory_resource()
mm/memory_hotplug: add missing mem_hotplug_lock
v2:
* Fixes are integrated and hence removed from this patch series
Suggestions from David:
* Add new flag MHP_OFFLINE_INACCESSIBLE to avoid accessing memory
during memory hotplug addition phase.
* Avoid page_init_poison() on memmap during mhp addition phase, when
MHP_OFFLINE_INACCESSIBLE mhp_flag is passed in add_memory().
* Do not skip add_pages() in arch_add_memory(). Similarly, remove
similar hacks in arch_remove_memory().
* Use MHP_PREPARE_ONLINE/MHP_FINISH_OFFLINE naming convention for
new memory notifiers.
* Rearrange removal of unused s390 memory notifier.
* Necessary commit messages changes.
Thank you
Sumanth Korikkar (7):
mm/memory_hotplug: introduce mhp_flag MHP_OFFLINE_INACCESSIBLE
mm/memory_hotplug: avoid poisoning memmap during mhp addition phase
mm/memory_hotplug: introduce MEM_PREPARE_ONLINE/MEM_FINISH_OFFLINE
notifiers
s390/mm: allocate vmemmap pages from self-contained memory range
s390/sclp: remove unhandled memory notifier type
s390/mm: implement MEM_PREPARE_ONLINE/MEM_FINISH_OFFLINE notifiers
s390: enable MHP_MEMMAP_ON_MEMORY
arch/s390/Kconfig | 1 +
arch/s390/mm/init.c | 3 --
arch/s390/mm/vmem.c | 62 +++++++++++++++++++---------------
drivers/base/memory.c | 23 +++++++++++--
drivers/s390/char/sclp_cmd.c | 31 ++++++++++++-----
include/linux/memory.h | 3 ++
include/linux/memory_hotplug.h | 12 ++++++-
include/linux/memremap.h | 1 +
mm/memory_hotplug.c | 30 ++++++++++++++--
mm/sparse.c | 3 +-
10 files changed, 124 insertions(+), 45 deletions(-)
--
2.39.2
