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mm: Kconfig: group swap, slab, hotplug and thp options into submenus
There are several clusters of related config options spread throughout the mostly flat MM submenu. Group them together and put specialization options into further subdirectories to make the MM submenu a bit more organized and easier to navigate. [hannes@cmpxchg.org: fix kbuild warnings] Link: https://lkml.kernel.org/r/YnvkSVivfnT57Vwh@cmpxchg.org [hannes@cmpxchg.org: fix more kbuild warnings] Link: https://lkml.kernel.org/r/Ynz8NusTdEGcCnJN@cmpxchg.org Link: https://lkml.kernel.org/r/20220510152847.230957-4-hannes@cmpxchg.org Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Dan Streetman <ddstreet@ieee.org> Cc: Michal Hocko <mhocko@suse.com> Cc: Minchan Kim <minchan@kernel.org> Cc: Roman Gushchin <guro@fb.com> Cc: Seth Jennings <sjenning@redhat.com> Cc: Shakeel Butt <shakeelb@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Johannes Weiner
akpm
parent
7b42f1041c
commit
519bcb7979
447
mm/Kconfig
447
mm/Kconfig
@ -9,7 +9,7 @@ menu "Memory Management options"
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config ARCH_NO_SWAP
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bool
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config SWAP
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menuconfig SWAP
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bool "Support for paging of anonymous memory (swap)"
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depends on MMU && BLOCK && !ARCH_NO_SWAP
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default y
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@ -19,6 +19,191 @@ config SWAP
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used to provide more virtual memory than the actual RAM present
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in your computer. If unsure say Y.
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config ZSWAP
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bool "Compressed cache for swap pages (EXPERIMENTAL)"
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depends on SWAP && CRYPTO=y
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select FRONTSWAP
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select ZPOOL
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help
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A lightweight compressed cache for swap pages. It takes
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pages that are in the process of being swapped out and attempts to
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compress them into a dynamically allocated RAM-based memory pool.
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This can result in a significant I/O reduction on swap device and,
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in the case where decompressing from RAM is faster that swap device
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reads, can also improve workload performance.
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This is marked experimental because it is a new feature (as of
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v3.11) that interacts heavily with memory reclaim. While these
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interactions don't cause any known issues on simple memory setups,
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they have not be fully explored on the large set of potential
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configurations and workloads that exist.
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choice
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prompt "Compressed cache for swap pages default compressor"
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depends on ZSWAP
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default ZSWAP_COMPRESSOR_DEFAULT_LZO
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help
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Selects the default compression algorithm for the compressed cache
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for swap pages.
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For an overview what kind of performance can be expected from
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a particular compression algorithm please refer to the benchmarks
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available at the following LWN page:
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https://lwn.net/Articles/751795/
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If in doubt, select 'LZO'.
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The selection made here can be overridden by using the kernel
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command line 'zswap.compressor=' option.
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config ZSWAP_COMPRESSOR_DEFAULT_DEFLATE
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bool "Deflate"
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select CRYPTO_DEFLATE
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help
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Use the Deflate algorithm as the default compression algorithm.
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config ZSWAP_COMPRESSOR_DEFAULT_LZO
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bool "LZO"
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select CRYPTO_LZO
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help
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Use the LZO algorithm as the default compression algorithm.
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config ZSWAP_COMPRESSOR_DEFAULT_842
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bool "842"
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select CRYPTO_842
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help
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Use the 842 algorithm as the default compression algorithm.
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config ZSWAP_COMPRESSOR_DEFAULT_LZ4
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bool "LZ4"
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select CRYPTO_LZ4
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help
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Use the LZ4 algorithm as the default compression algorithm.
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config ZSWAP_COMPRESSOR_DEFAULT_LZ4HC
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bool "LZ4HC"
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select CRYPTO_LZ4HC
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help
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Use the LZ4HC algorithm as the default compression algorithm.
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config ZSWAP_COMPRESSOR_DEFAULT_ZSTD
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bool "zstd"
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select CRYPTO_ZSTD
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help
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Use the zstd algorithm as the default compression algorithm.
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endchoice
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config ZSWAP_COMPRESSOR_DEFAULT
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string
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depends on ZSWAP
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default "deflate" if ZSWAP_COMPRESSOR_DEFAULT_DEFLATE
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default "lzo" if ZSWAP_COMPRESSOR_DEFAULT_LZO
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default "842" if ZSWAP_COMPRESSOR_DEFAULT_842
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default "lz4" if ZSWAP_COMPRESSOR_DEFAULT_LZ4
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default "lz4hc" if ZSWAP_COMPRESSOR_DEFAULT_LZ4HC
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default "zstd" if ZSWAP_COMPRESSOR_DEFAULT_ZSTD
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default ""
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choice
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prompt "Compressed cache for swap pages default allocator"
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depends on ZSWAP
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default ZSWAP_ZPOOL_DEFAULT_ZBUD
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help
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Selects the default allocator for the compressed cache for
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swap pages.
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The default is 'zbud' for compatibility, however please do
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read the description of each of the allocators below before
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making a right choice.
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The selection made here can be overridden by using the kernel
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command line 'zswap.zpool=' option.
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config ZSWAP_ZPOOL_DEFAULT_ZBUD
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bool "zbud"
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select ZBUD
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help
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Use the zbud allocator as the default allocator.
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config ZSWAP_ZPOOL_DEFAULT_Z3FOLD
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bool "z3fold"
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select Z3FOLD
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help
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Use the z3fold allocator as the default allocator.
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config ZSWAP_ZPOOL_DEFAULT_ZSMALLOC
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bool "zsmalloc"
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select ZSMALLOC
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help
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Use the zsmalloc allocator as the default allocator.
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endchoice
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config ZSWAP_ZPOOL_DEFAULT
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string
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depends on ZSWAP
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default "zbud" if ZSWAP_ZPOOL_DEFAULT_ZBUD
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default "z3fold" if ZSWAP_ZPOOL_DEFAULT_Z3FOLD
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default "zsmalloc" if ZSWAP_ZPOOL_DEFAULT_ZSMALLOC
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default ""
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config ZSWAP_DEFAULT_ON
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bool "Enable the compressed cache for swap pages by default"
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depends on ZSWAP
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help
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If selected, the compressed cache for swap pages will be enabled
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at boot, otherwise it will be disabled.
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The selection made here can be overridden by using the kernel
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command line 'zswap.enabled=' option.
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config ZPOOL
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tristate "Common API for compressed memory storage"
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depends on ZSWAP
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help
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Compressed memory storage API. This allows using either zbud or
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zsmalloc.
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config ZBUD
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tristate "Low (Up to 2x) density storage for compressed pages"
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depends on ZPOOL
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help
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A special purpose allocator for storing compressed pages.
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It is designed to store up to two compressed pages per physical
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page. While this design limits storage density, it has simple and
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deterministic reclaim properties that make it preferable to a higher
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density approach when reclaim will be used.
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config Z3FOLD
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tristate "Up to 3x density storage for compressed pages"
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depends on ZPOOL
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help
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A special purpose allocator for storing compressed pages.
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It is designed to store up to three compressed pages per physical
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page. It is a ZBUD derivative so the simplicity and determinism are
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still there.
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config ZSMALLOC
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tristate "Memory allocator for compressed pages"
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depends on MMU
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help
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zsmalloc is a slab-based memory allocator designed to store
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compressed RAM pages. zsmalloc uses virtual memory mapping
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in order to reduce fragmentation. However, this results in a
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non-standard allocator interface where a handle, not a pointer, is
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returned by an alloc(). This handle must be mapped in order to
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access the allocated space.
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config ZSMALLOC_STAT
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bool "Export zsmalloc statistics"
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depends on ZSMALLOC
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select DEBUG_FS
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help
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This option enables code in the zsmalloc to collect various
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statistics about what's happening in zsmalloc and exports that
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information to userspace via debugfs.
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If unsure, say N.
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menu "SLAB allocator options"
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choice
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prompt "Choose SLAB allocator"
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default SLUB
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@ -90,6 +275,19 @@ config SLAB_FREELIST_HARDENED
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sanity-checking than others. This option is most effective with
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CONFIG_SLUB.
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config SLUB_CPU_PARTIAL
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default y
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depends on SLUB && SMP
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bool "SLUB per cpu partial cache"
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help
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Per cpu partial caches accelerate objects allocation and freeing
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that is local to a processor at the price of more indeterminism
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in the latency of the free. On overflow these caches will be cleared
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which requires the taking of locks that may cause latency spikes.
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Typically one would choose no for a realtime system.
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endmenu # SLAB allocator options
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config SHUFFLE_PAGE_ALLOCATOR
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bool "Page allocator randomization"
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default SLAB_FREELIST_RANDOM && ACPI_NUMA
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@ -114,17 +312,6 @@ config SHUFFLE_PAGE_ALLOCATOR
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Say Y if unsure.
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config SLUB_CPU_PARTIAL
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default y
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depends on SLUB && SMP
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bool "SLUB per cpu partial cache"
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help
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Per cpu partial caches accelerate objects allocation and freeing
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that is local to a processor at the price of more indeterminism
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in the latency of the free. On overflow these caches will be cleared
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which requires the taking of locks that may cause latency spikes.
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Typically one would choose no for a realtime system.
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config SELECT_MEMORY_MODEL
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def_bool y
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depends on ARCH_SELECT_MEMORY_MODEL
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@ -249,15 +436,20 @@ config HAVE_BOOTMEM_INFO_NODE
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config ARCH_ENABLE_MEMORY_HOTPLUG
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bool
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config ARCH_ENABLE_MEMORY_HOTREMOVE
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bool
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# eventually, we can have this option just 'select SPARSEMEM'
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config MEMORY_HOTPLUG
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bool "Allow for memory hot-add"
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menuconfig MEMORY_HOTPLUG
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bool "Memory hotplug"
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select MEMORY_ISOLATION
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depends on SPARSEMEM
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depends on ARCH_ENABLE_MEMORY_HOTPLUG
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depends on 64BIT
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select NUMA_KEEP_MEMINFO if NUMA
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if MEMORY_HOTPLUG
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config MEMORY_HOTPLUG_DEFAULT_ONLINE
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bool "Online the newly added memory blocks by default"
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depends on MEMORY_HOTPLUG
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@ -273,9 +465,6 @@ config MEMORY_HOTPLUG_DEFAULT_ONLINE
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Say N here if you want the default policy to keep all hot-plugged
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memory blocks in 'offline' state.
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config ARCH_ENABLE_MEMORY_HOTREMOVE
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bool
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config MEMORY_HOTREMOVE
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bool "Allow for memory hot remove"
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select HAVE_BOOTMEM_INFO_NODE if (X86_64 || PPC64)
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@ -287,6 +476,8 @@ config MHP_MEMMAP_ON_MEMORY
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depends on MEMORY_HOTPLUG && SPARSEMEM_VMEMMAP
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depends on ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE
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endif # MEMORY_HOTPLUG
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# Heavily threaded applications may benefit from splitting the mm-wide
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# page_table_lock, so that faults on different parts of the user address
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# space can be handled with less contention: split it at this NR_CPUS.
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@ -501,7 +692,13 @@ config NOMMU_INITIAL_TRIM_EXCESS
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See Documentation/admin-guide/mm/nommu-mmap.rst for more information.
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config TRANSPARENT_HUGEPAGE
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config ARCH_WANT_GENERAL_HUGETLB
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bool
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config ARCH_WANTS_THP_SWAP
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def_bool n
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menuconfig TRANSPARENT_HUGEPAGE
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bool "Transparent Hugepage Support"
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depends on HAVE_ARCH_TRANSPARENT_HUGEPAGE && !PREEMPT_RT
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select COMPACTION
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@ -516,6 +713,8 @@ config TRANSPARENT_HUGEPAGE
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If memory constrained on embedded, you may want to say N.
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if TRANSPARENT_HUGEPAGE
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choice
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prompt "Transparent Hugepage Support sysfs defaults"
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depends on TRANSPARENT_HUGEPAGE
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@ -540,12 +739,6 @@ choice
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benefit.
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endchoice
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config ARCH_WANT_GENERAL_HUGETLB
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bool
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config ARCH_WANTS_THP_SWAP
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def_bool n
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config THP_SWAP
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def_bool y
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depends on TRANSPARENT_HUGEPAGE && ARCH_WANTS_THP_SWAP && SWAP
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@ -556,6 +749,19 @@ config THP_SWAP
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For selection by architectures with reasonable THP sizes.
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config READ_ONLY_THP_FOR_FS
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bool "Read-only THP for filesystems (EXPERIMENTAL)"
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depends on TRANSPARENT_HUGEPAGE && SHMEM
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help
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Allow khugepaged to put read-only file-backed pages in THP.
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This is marked experimental because it is a new feature. Write
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support of file THPs will be developed in the next few release
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cycles.
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endif # TRANSPARENT_HUGEPAGE
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#
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# UP and nommu archs use km based percpu allocator
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#
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@ -640,188 +846,6 @@ config MEM_SOFT_DIRTY
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See Documentation/admin-guide/mm/soft-dirty.rst for more details.
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config ZSWAP
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bool "Compressed cache for swap pages (EXPERIMENTAL)"
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depends on SWAP && CRYPTO=y
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select FRONTSWAP
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select ZPOOL
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help
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A lightweight compressed cache for swap pages. It takes
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pages that are in the process of being swapped out and attempts to
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compress them into a dynamically allocated RAM-based memory pool.
|
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This can result in a significant I/O reduction on swap device and,
|
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in the case where decompressing from RAM is faster that swap device
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reads, can also improve workload performance.
|
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|
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This is marked experimental because it is a new feature (as of
|
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v3.11) that interacts heavily with memory reclaim. While these
|
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interactions don't cause any known issues on simple memory setups,
|
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they have not be fully explored on the large set of potential
|
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configurations and workloads that exist.
|
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|
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choice
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prompt "Compressed cache for swap pages default compressor"
|
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depends on ZSWAP
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default ZSWAP_COMPRESSOR_DEFAULT_LZO
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help
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Selects the default compression algorithm for the compressed cache
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for swap pages.
|
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|
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For an overview what kind of performance can be expected from
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a particular compression algorithm please refer to the benchmarks
|
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available at the following LWN page:
|
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https://lwn.net/Articles/751795/
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|
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If in doubt, select 'LZO'.
|
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|
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The selection made here can be overridden by using the kernel
|
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command line 'zswap.compressor=' option.
|
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|
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config ZSWAP_COMPRESSOR_DEFAULT_DEFLATE
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bool "Deflate"
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select CRYPTO_DEFLATE
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help
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Use the Deflate algorithm as the default compression algorithm.
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config ZSWAP_COMPRESSOR_DEFAULT_LZO
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bool "LZO"
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select CRYPTO_LZO
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help
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Use the LZO algorithm as the default compression algorithm.
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config ZSWAP_COMPRESSOR_DEFAULT_842
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bool "842"
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select CRYPTO_842
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help
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Use the 842 algorithm as the default compression algorithm.
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config ZSWAP_COMPRESSOR_DEFAULT_LZ4
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bool "LZ4"
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select CRYPTO_LZ4
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help
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Use the LZ4 algorithm as the default compression algorithm.
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config ZSWAP_COMPRESSOR_DEFAULT_LZ4HC
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bool "LZ4HC"
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select CRYPTO_LZ4HC
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help
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Use the LZ4HC algorithm as the default compression algorithm.
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config ZSWAP_COMPRESSOR_DEFAULT_ZSTD
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bool "zstd"
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select CRYPTO_ZSTD
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help
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Use the zstd algorithm as the default compression algorithm.
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endchoice
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config ZSWAP_COMPRESSOR_DEFAULT
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string
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depends on ZSWAP
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default "deflate" if ZSWAP_COMPRESSOR_DEFAULT_DEFLATE
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default "lzo" if ZSWAP_COMPRESSOR_DEFAULT_LZO
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default "842" if ZSWAP_COMPRESSOR_DEFAULT_842
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default "lz4" if ZSWAP_COMPRESSOR_DEFAULT_LZ4
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default "lz4hc" if ZSWAP_COMPRESSOR_DEFAULT_LZ4HC
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default "zstd" if ZSWAP_COMPRESSOR_DEFAULT_ZSTD
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default ""
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choice
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prompt "Compressed cache for swap pages default allocator"
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depends on ZSWAP
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default ZSWAP_ZPOOL_DEFAULT_ZBUD
|
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help
|
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Selects the default allocator for the compressed cache for
|
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swap pages.
|
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The default is 'zbud' for compatibility, however please do
|
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read the description of each of the allocators below before
|
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making a right choice.
|
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|
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The selection made here can be overridden by using the kernel
|
||||
command line 'zswap.zpool=' option.
|
||||
|
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config ZSWAP_ZPOOL_DEFAULT_ZBUD
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bool "zbud"
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select ZBUD
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help
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Use the zbud allocator as the default allocator.
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config ZSWAP_ZPOOL_DEFAULT_Z3FOLD
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bool "z3fold"
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select Z3FOLD
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help
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Use the z3fold allocator as the default allocator.
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config ZSWAP_ZPOOL_DEFAULT_ZSMALLOC
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bool "zsmalloc"
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select ZSMALLOC
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help
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Use the zsmalloc allocator as the default allocator.
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endchoice
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config ZSWAP_ZPOOL_DEFAULT
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string
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depends on ZSWAP
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default "zbud" if ZSWAP_ZPOOL_DEFAULT_ZBUD
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default "z3fold" if ZSWAP_ZPOOL_DEFAULT_Z3FOLD
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default "zsmalloc" if ZSWAP_ZPOOL_DEFAULT_ZSMALLOC
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default ""
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config ZSWAP_DEFAULT_ON
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bool "Enable the compressed cache for swap pages by default"
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depends on ZSWAP
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help
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||||
If selected, the compressed cache for swap pages will be enabled
|
||||
at boot, otherwise it will be disabled.
|
||||
|
||||
The selection made here can be overridden by using the kernel
|
||||
command line 'zswap.enabled=' option.
|
||||
|
||||
config ZPOOL
|
||||
tristate "Common API for compressed memory storage"
|
||||
help
|
||||
Compressed memory storage API. This allows using either zbud or
|
||||
zsmalloc.
|
||||
|
||||
config ZBUD
|
||||
tristate "Low (Up to 2x) density storage for compressed pages"
|
||||
depends on ZPOOL
|
||||
help
|
||||
A special purpose allocator for storing compressed pages.
|
||||
It is designed to store up to two compressed pages per physical
|
||||
page. While this design limits storage density, it has simple and
|
||||
deterministic reclaim properties that make it preferable to a higher
|
||||
density approach when reclaim will be used.
|
||||
|
||||
config Z3FOLD
|
||||
tristate "Up to 3x density storage for compressed pages"
|
||||
depends on ZPOOL
|
||||
help
|
||||
A special purpose allocator for storing compressed pages.
|
||||
It is designed to store up to three compressed pages per physical
|
||||
page. It is a ZBUD derivative so the simplicity and determinism are
|
||||
still there.
|
||||
|
||||
config ZSMALLOC
|
||||
tristate "Memory allocator for compressed pages"
|
||||
depends on MMU
|
||||
help
|
||||
zsmalloc is a slab-based memory allocator designed to store
|
||||
compressed RAM pages. zsmalloc uses virtual memory mapping
|
||||
in order to reduce fragmentation. However, this results in a
|
||||
non-standard allocator interface where a handle, not a pointer, is
|
||||
returned by an alloc(). This handle must be mapped in order to
|
||||
access the allocated space.
|
||||
|
||||
config ZSMALLOC_STAT
|
||||
bool "Export zsmalloc statistics"
|
||||
depends on ZSMALLOC
|
||||
select DEBUG_FS
|
||||
help
|
||||
This option enables code in the zsmalloc to collect various
|
||||
statistics about what's happening in zsmalloc and exports that
|
||||
information to userspace via debugfs.
|
||||
If unsure, say N.
|
||||
|
||||
config GENERIC_EARLY_IOREMAP
|
||||
bool
|
||||
|
||||
@ -978,17 +1002,6 @@ comment "GUP_TEST needs to have DEBUG_FS enabled"
|
||||
config GUP_GET_PTE_LOW_HIGH
|
||||
bool
|
||||
|
||||
config READ_ONLY_THP_FOR_FS
|
||||
bool "Read-only THP for filesystems (EXPERIMENTAL)"
|
||||
depends on TRANSPARENT_HUGEPAGE && 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
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user