mm: Kconfig: simplify zswap configuration
- CONFIG_ZRAM: Zram is a user-facing feature, whereas zsmalloc is not. Don't make the user chase down a technical dependency like that, just select it in automatically when zram is requested. The CONFIG_CRYPTO dependency is redundant due to more specific deps. - CONFIG_ZPOOL: This is not a user-facing feature. Hide the symbol and have it selected in as needed. - CONFIG_ZSWAP: Select CRYPTO instead of depend. Common pattern. - Make the ZSWAP suboptions and their descriptions (compression, allocation backend) a bit more straight-forward for the user. Link: https://lkml.kernel.org/r/20220510152847.230957-5-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>
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Johannes Weiner
akpm
parent
519bcb7979
commit
b3fbd58fcb
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@ -1,8 +1,9 @@
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# SPDX-License-Identifier: GPL-2.0
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config ZRAM
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tristate "Compressed RAM block device support"
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depends on BLOCK && SYSFS && ZSMALLOC && CRYPTO
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depends on BLOCK && SYSFS
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depends on CRYPTO_LZO || CRYPTO_ZSTD || CRYPTO_LZ4 || CRYPTO_LZ4HC || CRYPTO_842
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select ZSMALLOC
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help
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Creates virtual block devices called /dev/zramX (X = 0, 1, ...).
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Pages written to these disks are compressed and stored in memory
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55
mm/Kconfig
55
mm/Kconfig
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@ -9,6 +9,9 @@ menu "Memory Management options"
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config ARCH_NO_SWAP
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bool
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config ZPOOL
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bool
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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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@ -21,8 +24,9 @@ menuconfig SWAP
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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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depends on SWAP
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select FRONTSWAP
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select CRYPTO
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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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@ -38,8 +42,18 @@ config ZSWAP
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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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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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choice
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prompt "Compressed cache for swap pages default compressor"
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prompt "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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@ -105,7 +119,7 @@ config ZSWAP_COMPRESSOR_DEFAULT
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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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prompt "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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@ -145,26 +159,9 @@ config ZSWAP_ZPOOL_DEFAULT
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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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tristate "2:1 compression allocator (zbud)"
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depends on ZSWAP
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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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@ -173,8 +170,8 @@ config ZBUD
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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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tristate "3:1 compression allocator (z3fold)"
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depends on ZSWAP
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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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@ -182,15 +179,13 @@ config Z3FOLD
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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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tristate
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prompt "N:1 compression allocator (zsmalloc)" if ZSWAP
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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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pages of various compression levels efficiently. It achieves
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the highest storage density with the least amount of fragmentation.
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config ZSMALLOC_STAT
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bool "Export zsmalloc statistics"
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