depends on SPARSEMEM && SPARSEMEM_VMEMMAP_ENABLE
default y
help
- SPARSEMEM_VMEMMAP uses a virtually mapped memmap to optimise
- pfn_to_page and page_to_pfn operations. This is the most
- efficient option when sufficient kernel resources are available.
+ SPARSEMEM_VMEMMAP uses a virtually mapped memmap to optimise
+ pfn_to_page and page_to_pfn operations. This is the most
+ efficient option when sufficient kernel resources are available.
config HAVE_MEMBLOCK_NODE_MAP
bool
depends on SPARSEMEM && MEMORY_HOTPLUG
config MEMORY_HOTPLUG_DEFAULT_ONLINE
- bool "Online the newly added memory blocks by default"
- depends on MEMORY_HOTPLUG
- help
+ bool "Online the newly added memory blocks by default"
+ depends on MEMORY_HOTPLUG
+ help
This option sets the default policy setting for memory hotplug
onlining policy (/sys/devices/system/memory/auto_online_blocks) which
determines what happens to newly added memory regions. Policy setting
select MIGRATION
depends on MMU
help
- Compaction is the only memory management component to form
- high order (larger physically contiguous) memory blocks
- reliably. The page allocator relies on compaction heavily and
- the lack of the feature can lead to unexpected OOM killer
- invocations for high order memory requests. You shouldn't
- disable this option unless there really is a strong reason for
- it and then we would be really interested to hear about that at
- linux-mm@kvack.org.
+ Compaction is the only memory management component to form
+ high order (larger physically contiguous) memory blocks
+ reliably. The page allocator relies on compaction heavily and
+ the lack of the feature can lead to unexpected OOM killer
+ invocations for high order memory requests. You shouldn't
+ disable this option unless there really is a strong reason for
+ it and then we would be really interested to hear about that at
+ linux-mm@kvack.org.
#
# support for page migration
bool
config CONTIG_ALLOC
- def_bool (MEMORY_ISOLATION && COMPACTION) || CMA
+ def_bool (MEMORY_ISOLATION && COMPACTION) || CMA
config PHYS_ADDR_T_64BIT
def_bool 64BIT
root has set /sys/kernel/mm/ksm/run to 1 (if CONFIG_SYSFS is set).
config DEFAULT_MMAP_MIN_ADDR
- int "Low address space to protect from user allocation"
+ int "Low address space to protect from user allocation"
depends on MMU
- default 4096
- help
+ default 4096
+ help
This is the portion of low virtual memory which should be protected
from userspace allocation. Keeping a user from writing to low pages
can help reduce the impact of kernel NULL pointer bugs.
endchoice
config ARCH_WANTS_THP_SWAP
- def_bool n
+ def_bool n
config THP_SWAP
def_bool y