diff options
Diffstat (limited to 'mm/Kconfig')
| -rw-r--r-- | mm/Kconfig | 82 |
1 files changed, 44 insertions, 38 deletions
diff --git a/mm/Kconfig b/mm/Kconfig index 25c71eb8a7db..ee8d1f311858 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -11,23 +11,24 @@ choice default DISCONTIGMEM_MANUAL if ARCH_DISCONTIGMEM_DEFAULT default SPARSEMEM_MANUAL if ARCH_SPARSEMEM_DEFAULT default FLATMEM_MANUAL + help + This option allows you to change some of the ways that + Linux manages its memory internally. Most users will + only have one option here selected by the architecture + configuration. This is normal. config FLATMEM_MANUAL bool "Flat Memory" depends on !(ARCH_DISCONTIGMEM_ENABLE || ARCH_SPARSEMEM_ENABLE) || ARCH_FLATMEM_ENABLE help - This option allows you to change some of the ways that - Linux manages its memory internally. Most users will - only have one option here: FLATMEM. This is normal - and a correct option. - - Some users of more advanced features like NUMA and - memory hotplug may have different options here. - DISCONTIGMEM is a more mature, better tested system, - but is incompatible with memory hotplug and may suffer - decreased performance over SPARSEMEM. If unsure between - "Sparse Memory" and "Discontiguous Memory", choose - "Discontiguous Memory". + This option is best suited for non-NUMA systems with + flat address space. The FLATMEM is the most efficient + system in terms of performance and resource consumption + and it is the best option for smaller systems. + + For systems that have holes in their physical address + spaces and for features like NUMA and memory hotplug, + choose "Sparse Memory" If unsure, choose this option (Flat Memory) over any other. @@ -38,29 +39,26 @@ config DISCONTIGMEM_MANUAL This option provides enhanced support for discontiguous memory systems, over FLATMEM. These systems have holes in their physical address spaces, and this option provides - more efficient handling of these holes. However, the vast - majority of hardware has quite flat address spaces, and - can have degraded performance from the extra overhead that - this option imposes. + more efficient handling of these holes. - Many NUMA configurations will have this as the only option. + Although "Discontiguous Memory" is still used by several + architectures, it is considered deprecated in favor of + "Sparse Memory". - If unsure, choose "Flat Memory" over this option. + If unsure, choose "Sparse Memory" over this option. config SPARSEMEM_MANUAL bool "Sparse Memory" depends on ARCH_SPARSEMEM_ENABLE help This will be the only option for some systems, including - memory hotplug systems. This is normal. + memory hot-plug systems. This is normal. - For many other systems, this will be an alternative to - "Discontiguous Memory". This option provides some potential - performance benefits, along with decreased code complexity, - but it is newer, and more experimental. + This option provides efficient support for systems with + holes is their physical address space and allows memory + hot-plug and hot-remove. - If unsure, choose "Discontiguous Memory" or "Flat Memory" - over this option. + If unsure, choose "Flat Memory" over this option. endchoice @@ -136,7 +134,7 @@ config HAVE_MEMBLOCK_PHYS_MAP config HAVE_GENERIC_GUP bool -config ARCH_DISCARD_MEMBLOCK +config ARCH_KEEP_MEMBLOCK bool config MEMORY_ISOLATION @@ -161,7 +159,6 @@ config MEMORY_HOTPLUG_SPARSE config MEMORY_HOTPLUG_DEFAULT_ONLINE bool "Online the newly added memory blocks by default" - default n depends on MEMORY_HOTPLUG help This option sets the default policy setting for memory hotplug @@ -258,6 +255,9 @@ config ARCH_ENABLE_HUGEPAGE_MIGRATION config ARCH_ENABLE_THP_MIGRATION bool +config CONTIG_ALLOC + def_bool (MEMORY_ISOLATION && COMPACTION) || CMA + config PHYS_ADDR_T_64BIT def_bool 64BIT @@ -436,7 +436,6 @@ config NEED_PER_CPU_KM config CLEANCACHE bool "Enable cleancache driver to cache clean pages if tmem is present" - default n help Cleancache can be thought of as a page-granularity victim cache for clean pages that the kernel's pageframe replacement algorithm @@ -460,7 +459,6 @@ config CLEANCACHE config FRONTSWAP bool "Enable frontswap to cache swap pages if tmem is present" depends on SWAP - default n help Frontswap is so named because it can be thought of as the opposite of a "backing" store for a swap device. The data is stored into @@ -532,7 +530,6 @@ config ZSWAP depends on FRONTSWAP && CRYPTO=y select CRYPTO_LZO select ZPOOL - default n help A lightweight compressed cache for swap pages. It takes pages that are in the process of being swapped out and attempts to @@ -549,14 +546,12 @@ config ZSWAP config ZPOOL tristate "Common API for compressed memory storage" - default n help Compressed memory storage API. This allows using either zbud or zsmalloc. config ZBUD tristate "Low (Up to 2x) density storage for compressed pages" - default n help A special purpose allocator for storing compressed pages. It is designed to store up to two compressed pages per physical @@ -567,7 +562,6 @@ config ZBUD config Z3FOLD tristate "Up to 3x density storage for compressed pages" depends on ZPOOL - default n help A special purpose allocator for storing compressed pages. It is designed to store up to three compressed pages per physical @@ -577,7 +571,6 @@ config Z3FOLD config ZSMALLOC tristate "Memory allocator for compressed pages" depends on MMU - default n help zsmalloc is a slab-based memory allocator designed to store compressed RAM pages. zsmalloc uses virtual memory mapping @@ -628,7 +621,6 @@ config MAX_STACK_SIZE_MB config DEFERRED_STRUCT_PAGE_INIT bool "Defer initialisation of struct pages to kthreads" - default n depends on SPARSEMEM depends on !NEED_PER_CPU_KM depends on 64BIT @@ -676,6 +668,22 @@ config ZONE_DEVICE If FS_DAX is enabled, then say Y. +config ARCH_HAS_HMM_MIRROR + bool + default y + depends on (X86_64 || PPC64) + depends on MMU && 64BIT + +config ARCH_HAS_HMM_DEVICE + bool + default y + depends on (X86_64 || PPC64) + depends on MEMORY_HOTPLUG + depends on MEMORY_HOTREMOVE + depends on SPARSEMEM_VMEMMAP + depends on ARCH_HAS_ZONE_DEVICE + select XARRAY_MULTI + config ARCH_HAS_HMM bool default y @@ -694,12 +702,12 @@ config DEV_PAGEMAP_OPS config HMM bool + select MMU_NOTIFIER select MIGRATE_VMA_HELPER config HMM_MIRROR bool "HMM mirror CPU page table into a device page table" depends on ARCH_HAS_HMM - select MMU_NOTIFIER select HMM help Select HMM_MIRROR if you want to mirror range of the CPU page table of a @@ -740,7 +748,6 @@ config ARCH_HAS_PKEYS config PERCPU_STATS bool "Collect percpu memory statistics" - default n help This feature collects and exposes statistics via debugfs. The information includes global and per chunk statistics, which can @@ -748,7 +755,6 @@ config PERCPU_STATS config GUP_BENCHMARK bool "Enable infrastructure for get_user_pages_fast() benchmarking" - default n help Provides /sys/kernel/debug/gup_benchmark that helps with testing performance of get_user_pages_fast(). |