diff options
Diffstat (limited to 'mm/Kconfig')
| -rw-r--r-- | mm/Kconfig | 79 |
1 files changed, 41 insertions, 38 deletions
diff --git a/mm/Kconfig b/mm/Kconfig index 56cec636a1fc..ab80933be65f 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -29,7 +29,7 @@ config FLATMEM_MANUAL For systems that have holes in their physical address spaces and for features like NUMA and memory hotplug, - choose "Sparse Memory" + choose "Sparse Memory". If unsure, choose this option (Flat Memory) over any other. @@ -122,9 +122,9 @@ config SPARSEMEM_VMEMMAP 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 @@ -160,9 +160,9 @@ config MEMORY_HOTPLUG_SPARSE 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 @@ -227,14 +227,14 @@ config COMPACTION 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 @@ -258,7 +258,7 @@ config ARCH_ENABLE_THP_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 @@ -273,11 +273,6 @@ config BOUNCE by default when ZONE_DMA or HIGHMEM is selected, but you may say n to override this. -config NR_QUICK - int - depends on QUICKLIST - default "1" - config VIRT_TO_BUS bool help @@ -289,6 +284,7 @@ config VIRT_TO_BUS config MMU_NOTIFIER bool select SRCU + select INTERVAL_TREE config KSM bool "Enable KSM for page merging" @@ -306,10 +302,10 @@ config KSM 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. @@ -412,7 +408,7 @@ choice endchoice config ARCH_WANTS_THP_SWAP - def_bool n + def_bool n config THP_SWAP def_bool y @@ -669,23 +665,16 @@ config ZONE_DEVICE If FS_DAX is enabled, then say Y. -config MIGRATE_VMA_HELPER - bool - config DEV_PAGEMAP_OPS bool +# +# Helpers to mirror range of the CPU page tables of a process into device page +# tables. +# config HMM_MIRROR - bool "HMM mirror CPU page table into a device page table" - depends on (X86_64 || PPC64) - depends on MMU && 64BIT - select MMU_NOTIFIER - help - Select HMM_MIRROR if you want to mirror range of the CPU page table of a - process into a device page table. Here, mirror means "keep synchronized". - Prerequisites: the device must provide the ability to write-protect its - page tables (at PAGE_SIZE granularity), and must be able to recover from - the resulting potential page faults. + bool + depends on MMU config DEVICE_PRIVATE bool "Unaddressable device memory (GPU memory, ...)" @@ -723,6 +712,17 @@ config GUP_BENCHMARK config GUP_GET_PTE_LOW_HIGH bool +config READ_ONLY_THP_FOR_FS + bool "Read-only THP for filesystems (EXPERIMENTAL)" + depends on TRANSPARENT_HUGE_PAGECACHE && SHMEM + + help + Allow khugepaged to put read-only file-backed pages in THP. + + This is marked experimental because it is a new feature. Write + support of file THPs will be developed in the next few release + cycles. + config ARCH_HAS_PTE_SPECIAL bool @@ -736,4 +736,7 @@ config ARCH_HAS_PTE_SPECIAL config ARCH_HAS_HUGEPD bool +config MAPPING_DIRTY_HELPERS + bool + endmenu |
