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 2022-05-19 14:08:53 -07:00 committed by akpm
parent 7b42f1041c
commit 519bcb7979

View File

@ -9,7 +9,7 @@ menu "Memory Management options"
config ARCH_NO_SWAP
bool
config SWAP
menuconfig SWAP
bool "Support for paging of anonymous memory (swap)"
depends on MMU && BLOCK && !ARCH_NO_SWAP
default y
@ -19,6 +19,191 @@ config SWAP
used to provide more virtual memory than the actual RAM present
in your computer. If unsure say Y.
config ZSWAP
bool "Compressed cache for swap pages (EXPERIMENTAL)"
depends on SWAP && CRYPTO=y
select FRONTSWAP
select ZPOOL
help
A lightweight compressed cache for swap pages. It takes
pages that are in the process of being swapped out and attempts to
compress them into a dynamically allocated RAM-based memory pool.
This can result in a significant I/O reduction on swap device and,
in the case where decompressing from RAM is faster that swap device
reads, can also improve workload performance.
This is marked experimental because it is a new feature (as of
v3.11) that interacts heavily with memory reclaim. While these
interactions don't cause any known issues on simple memory setups,
they have not be fully explored on the large set of potential
configurations and workloads that exist.
choice
prompt "Compressed cache for swap pages default compressor"
depends on ZSWAP
default ZSWAP_COMPRESSOR_DEFAULT_LZO
help
Selects the default compression algorithm for the compressed cache
for swap pages.
For an overview what kind of performance can be expected from
a particular compression algorithm please refer to the benchmarks
available at the following LWN page:
https://lwn.net/Articles/751795/
If in doubt, select 'LZO'.
The selection made here can be overridden by using the kernel
command line 'zswap.compressor=' option.
config ZSWAP_COMPRESSOR_DEFAULT_DEFLATE
bool "Deflate"
select CRYPTO_DEFLATE
help
Use the Deflate algorithm as the default compression algorithm.
config ZSWAP_COMPRESSOR_DEFAULT_LZO
bool "LZO"
select CRYPTO_LZO
help
Use the LZO algorithm as the default compression algorithm.
config ZSWAP_COMPRESSOR_DEFAULT_842
bool "842"
select CRYPTO_842
help
Use the 842 algorithm as the default compression algorithm.
config ZSWAP_COMPRESSOR_DEFAULT_LZ4
bool "LZ4"
select CRYPTO_LZ4
help
Use the LZ4 algorithm as the default compression algorithm.
config ZSWAP_COMPRESSOR_DEFAULT_LZ4HC
bool "LZ4HC"
select CRYPTO_LZ4HC
help
Use the LZ4HC algorithm as the default compression algorithm.
config ZSWAP_COMPRESSOR_DEFAULT_ZSTD
bool "zstd"
select CRYPTO_ZSTD
help
Use the zstd algorithm as the default compression algorithm.
endchoice
config ZSWAP_COMPRESSOR_DEFAULT
string
depends on ZSWAP
default "deflate" if ZSWAP_COMPRESSOR_DEFAULT_DEFLATE
default "lzo" if ZSWAP_COMPRESSOR_DEFAULT_LZO
default "842" if ZSWAP_COMPRESSOR_DEFAULT_842
default "lz4" if ZSWAP_COMPRESSOR_DEFAULT_LZ4
default "lz4hc" if ZSWAP_COMPRESSOR_DEFAULT_LZ4HC
default "zstd" if ZSWAP_COMPRESSOR_DEFAULT_ZSTD
default ""
choice
prompt "Compressed cache for swap pages default allocator"
depends on ZSWAP
default ZSWAP_ZPOOL_DEFAULT_ZBUD
help
Selects the default allocator for the compressed cache for
swap pages.
The default is 'zbud' for compatibility, however please do
read the description of each of the allocators below before
making a right choice.
The selection made here can be overridden by using the kernel
command line 'zswap.zpool=' option.
config ZSWAP_ZPOOL_DEFAULT_ZBUD
bool "zbud"
select ZBUD
help
Use the zbud allocator as the default allocator.
config ZSWAP_ZPOOL_DEFAULT_Z3FOLD
bool "z3fold"
select Z3FOLD
help
Use the z3fold allocator as the default allocator.
config ZSWAP_ZPOOL_DEFAULT_ZSMALLOC
bool "zsmalloc"
select ZSMALLOC
help
Use the zsmalloc allocator as the default allocator.
endchoice
config ZSWAP_ZPOOL_DEFAULT
string
depends on ZSWAP
default "zbud" if ZSWAP_ZPOOL_DEFAULT_ZBUD
default "z3fold" if ZSWAP_ZPOOL_DEFAULT_Z3FOLD
default "zsmalloc" if ZSWAP_ZPOOL_DEFAULT_ZSMALLOC
default ""
config ZSWAP_DEFAULT_ON
bool "Enable the compressed cache for swap pages by default"
depends on ZSWAP
help
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"
depends on ZSWAP
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.
menu "SLAB allocator options"
choice
prompt "Choose SLAB allocator"
default SLUB
@ -90,6 +275,19 @@ config SLAB_FREELIST_HARDENED
sanity-checking than others. This option is most effective with
CONFIG_SLUB.
config SLUB_CPU_PARTIAL
default y
depends on SLUB && SMP
bool "SLUB per cpu partial cache"
help
Per cpu partial caches accelerate objects allocation and freeing
that is local to a processor at the price of more indeterminism
in the latency of the free. On overflow these caches will be cleared
which requires the taking of locks that may cause latency spikes.
Typically one would choose no for a realtime system.
endmenu # SLAB allocator options
config SHUFFLE_PAGE_ALLOCATOR
bool "Page allocator randomization"
default SLAB_FREELIST_RANDOM && ACPI_NUMA
@ -114,17 +312,6 @@ config SHUFFLE_PAGE_ALLOCATOR
Say Y if unsure.
config SLUB_CPU_PARTIAL
default y
depends on SLUB && SMP
bool "SLUB per cpu partial cache"
help
Per cpu partial caches accelerate objects allocation and freeing
that is local to a processor at the price of more indeterminism
in the latency of the free. On overflow these caches will be cleared
which requires the taking of locks that may cause latency spikes.
Typically one would choose no for a realtime system.
config SELECT_MEMORY_MODEL
def_bool y
depends on ARCH_SELECT_MEMORY_MODEL
@ -249,15 +436,20 @@ config HAVE_BOOTMEM_INFO_NODE
config ARCH_ENABLE_MEMORY_HOTPLUG
bool
config ARCH_ENABLE_MEMORY_HOTREMOVE
bool
# eventually, we can have this option just 'select SPARSEMEM'
config MEMORY_HOTPLUG
bool "Allow for memory hot-add"
menuconfig MEMORY_HOTPLUG
bool "Memory hotplug"
select MEMORY_ISOLATION
depends on SPARSEMEM
depends on ARCH_ENABLE_MEMORY_HOTPLUG
depends on 64BIT
select NUMA_KEEP_MEMINFO if NUMA
if MEMORY_HOTPLUG
config MEMORY_HOTPLUG_DEFAULT_ONLINE
bool "Online the newly added memory blocks by default"
depends on MEMORY_HOTPLUG
@ -273,9 +465,6 @@ config MEMORY_HOTPLUG_DEFAULT_ONLINE
Say N here if you want the default policy to keep all hot-plugged
memory blocks in 'offline' state.
config ARCH_ENABLE_MEMORY_HOTREMOVE
bool
config MEMORY_HOTREMOVE
bool "Allow for memory hot remove"
select HAVE_BOOTMEM_INFO_NODE if (X86_64 || PPC64)
@ -287,6 +476,8 @@ config MHP_MEMMAP_ON_MEMORY
depends on MEMORY_HOTPLUG && SPARSEMEM_VMEMMAP
depends on ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE
endif # MEMORY_HOTPLUG
# Heavily threaded applications may benefit from splitting the mm-wide
# page_table_lock, so that faults on different parts of the user address
# space can be handled with less contention: split it at this NR_CPUS.
@ -501,7 +692,13 @@ config NOMMU_INITIAL_TRIM_EXCESS
See Documentation/admin-guide/mm/nommu-mmap.rst for more information.
config TRANSPARENT_HUGEPAGE
config ARCH_WANT_GENERAL_HUGETLB
bool
config ARCH_WANTS_THP_SWAP
def_bool n
menuconfig TRANSPARENT_HUGEPAGE
bool "Transparent Hugepage Support"
depends on HAVE_ARCH_TRANSPARENT_HUGEPAGE && !PREEMPT_RT
select COMPACTION
@ -516,6 +713,8 @@ config TRANSPARENT_HUGEPAGE
If memory constrained on embedded, you may want to say N.
if TRANSPARENT_HUGEPAGE
choice
prompt "Transparent Hugepage Support sysfs defaults"
depends on TRANSPARENT_HUGEPAGE
@ -540,12 +739,6 @@ choice
benefit.
endchoice
config ARCH_WANT_GENERAL_HUGETLB
bool
config ARCH_WANTS_THP_SWAP
def_bool n
config THP_SWAP
def_bool y
depends on TRANSPARENT_HUGEPAGE && ARCH_WANTS_THP_SWAP && SWAP
@ -556,6 +749,19 @@ config THP_SWAP
For selection by architectures with reasonable THP sizes.
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.
endif # TRANSPARENT_HUGEPAGE
#
# UP and nommu archs use km based percpu allocator
#
@ -640,188 +846,6 @@ config MEM_SOFT_DIRTY
See Documentation/admin-guide/mm/soft-dirty.rst for more details.
config ZSWAP
bool "Compressed cache for swap pages (EXPERIMENTAL)"
depends on SWAP && CRYPTO=y
select FRONTSWAP
select ZPOOL
help
A lightweight compressed cache for swap pages. It takes
pages that are in the process of being swapped out and attempts to
compress them into a dynamically allocated RAM-based memory pool.
This can result in a significant I/O reduction on swap device and,
in the case where decompressing from RAM is faster that swap device
reads, can also improve workload performance.
This is marked experimental because it is a new feature (as of
v3.11) that interacts heavily with memory reclaim. While these
interactions don't cause any known issues on simple memory setups,
they have not be fully explored on the large set of potential
configurations and workloads that exist.
choice
prompt "Compressed cache for swap pages default compressor"
depends on ZSWAP
default ZSWAP_COMPRESSOR_DEFAULT_LZO
help
Selects the default compression algorithm for the compressed cache
for swap pages.
For an overview what kind of performance can be expected from
a particular compression algorithm please refer to the benchmarks
available at the following LWN page:
https://lwn.net/Articles/751795/
If in doubt, select 'LZO'.
The selection made here can be overridden by using the kernel
command line 'zswap.compressor=' option.
config ZSWAP_COMPRESSOR_DEFAULT_DEFLATE
bool "Deflate"
select CRYPTO_DEFLATE
help
Use the Deflate algorithm as the default compression algorithm.
config ZSWAP_COMPRESSOR_DEFAULT_LZO
bool "LZO"
select CRYPTO_LZO
help
Use the LZO algorithm as the default compression algorithm.
config ZSWAP_COMPRESSOR_DEFAULT_842
bool "842"
select CRYPTO_842
help
Use the 842 algorithm as the default compression algorithm.
config ZSWAP_COMPRESSOR_DEFAULT_LZ4
bool "LZ4"
select CRYPTO_LZ4
help
Use the LZ4 algorithm as the default compression algorithm.
config ZSWAP_COMPRESSOR_DEFAULT_LZ4HC
bool "LZ4HC"
select CRYPTO_LZ4HC
help
Use the LZ4HC algorithm as the default compression algorithm.
config ZSWAP_COMPRESSOR_DEFAULT_ZSTD
bool "zstd"
select CRYPTO_ZSTD
help
Use the zstd algorithm as the default compression algorithm.
endchoice
config ZSWAP_COMPRESSOR_DEFAULT
string
depends on ZSWAP
default "deflate" if ZSWAP_COMPRESSOR_DEFAULT_DEFLATE
default "lzo" if ZSWAP_COMPRESSOR_DEFAULT_LZO
default "842" if ZSWAP_COMPRESSOR_DEFAULT_842
default "lz4" if ZSWAP_COMPRESSOR_DEFAULT_LZ4
default "lz4hc" if ZSWAP_COMPRESSOR_DEFAULT_LZ4HC
default "zstd" if ZSWAP_COMPRESSOR_DEFAULT_ZSTD
default ""
choice
prompt "Compressed cache for swap pages default allocator"
depends on ZSWAP
default ZSWAP_ZPOOL_DEFAULT_ZBUD
help
Selects the default allocator for the compressed cache for
swap pages.
The default is 'zbud' for compatibility, however please do
read the description of each of the allocators below before
making a right choice.
The selection made here can be overridden by using the kernel
command line 'zswap.zpool=' option.
config ZSWAP_ZPOOL_DEFAULT_ZBUD
bool "zbud"
select ZBUD
help
Use the zbud allocator as the default allocator.
config ZSWAP_ZPOOL_DEFAULT_Z3FOLD
bool "z3fold"
select Z3FOLD
help
Use the z3fold allocator as the default allocator.
config ZSWAP_ZPOOL_DEFAULT_ZSMALLOC
bool "zsmalloc"
select ZSMALLOC
help
Use the zsmalloc allocator as the default allocator.
endchoice
config ZSWAP_ZPOOL_DEFAULT
string
depends on ZSWAP
default "zbud" if ZSWAP_ZPOOL_DEFAULT_ZBUD
default "z3fold" if ZSWAP_ZPOOL_DEFAULT_Z3FOLD
default "zsmalloc" if ZSWAP_ZPOOL_DEFAULT_ZSMALLOC
default ""
config ZSWAP_DEFAULT_ON
bool "Enable the compressed cache for swap pages by default"
depends on ZSWAP
help
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