| Kconfig (36e66c554b5c6a9d17a229faca7a61693527b0bd) | Kconfig (bb8b93b5b65130138d3c80f3136af721863f561a) |
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| 1# SPDX-License-Identifier: GPL-2.0-only 2 3menu "Memory Management options" 4 5config SELECT_MEMORY_MODEL 6 def_bool y 7 depends on ARCH_SELECT_MEMORY_MODEL 8 --- 519 unchanged lines hidden (view full) --- 528 into a page just as regular dirty bit, but unlike the latter 529 it can be cleared by hands. 530 531 See Documentation/admin-guide/mm/soft-dirty.rst for more details. 532 533config ZSWAP 534 bool "Compressed cache for swap pages (EXPERIMENTAL)" 535 depends on FRONTSWAP && CRYPTO=y | 1# SPDX-License-Identifier: GPL-2.0-only 2 3menu "Memory Management options" 4 5config SELECT_MEMORY_MODEL 6 def_bool y 7 depends on ARCH_SELECT_MEMORY_MODEL 8 --- 519 unchanged lines hidden (view full) --- 528 into a page just as regular dirty bit, but unlike the latter 529 it can be cleared by hands. 530 531 See Documentation/admin-guide/mm/soft-dirty.rst for more details. 532 533config ZSWAP 534 bool "Compressed cache for swap pages (EXPERIMENTAL)" 535 depends on FRONTSWAP && CRYPTO=y |
| 536 select CRYPTO_LZO | |
| 537 select ZPOOL 538 help 539 A lightweight compressed cache for swap pages. It takes 540 pages that are in the process of being swapped out and attempts to 541 compress them into a dynamically allocated RAM-based memory pool. 542 This can result in a significant I/O reduction on swap device and, 543 in the case where decompressing from RAM is faster that swap device 544 reads, can also improve workload performance. 545 546 This is marked experimental because it is a new feature (as of 547 v3.11) that interacts heavily with memory reclaim. While these 548 interactions don't cause any known issues on simple memory setups, 549 they have not be fully explored on the large set of potential 550 configurations and workloads that exist. 551 | 536 select ZPOOL 537 help 538 A lightweight compressed cache for swap pages. It takes 539 pages that are in the process of being swapped out and attempts to 540 compress them into a dynamically allocated RAM-based memory pool. 541 This can result in a significant I/O reduction on swap device and, 542 in the case where decompressing from RAM is faster that swap device 543 reads, can also improve workload performance. 544 545 This is marked experimental because it is a new feature (as of 546 v3.11) that interacts heavily with memory reclaim. While these 547 interactions don't cause any known issues on simple memory setups, 548 they have not be fully explored on the large set of potential 549 configurations and workloads that exist. 550 |
| 551choice 552 prompt "Compressed cache for swap pages default compressor" 553 depends on ZSWAP 554 default ZSWAP_COMPRESSOR_DEFAULT_LZO 555 help 556 Selects the default compression algorithm for the compressed cache 557 for swap pages. 558 559 For an overview what kind of performance can be expected from 560 a particular compression algorithm please refer to the benchmarks 561 available at the following LWN page: 562 https://lwn.net/Articles/751795/ 563 564 If in doubt, select 'LZO'. 565 566 The selection made here can be overridden by using the kernel 567 command line 'zswap.compressor=' option. 568 569config ZSWAP_COMPRESSOR_DEFAULT_DEFLATE 570 bool "Deflate" 571 select CRYPTO_DEFLATE 572 help 573 Use the Deflate algorithm as the default compression algorithm. 574 575config ZSWAP_COMPRESSOR_DEFAULT_LZO 576 bool "LZO" 577 select CRYPTO_LZO 578 help 579 Use the LZO algorithm as the default compression algorithm. 580 581config ZSWAP_COMPRESSOR_DEFAULT_842 582 bool "842" 583 select CRYPTO_842 584 help 585 Use the 842 algorithm as the default compression algorithm. 586 587config ZSWAP_COMPRESSOR_DEFAULT_LZ4 588 bool "LZ4" 589 select CRYPTO_LZ4 590 help 591 Use the LZ4 algorithm as the default compression algorithm. 592 593config ZSWAP_COMPRESSOR_DEFAULT_LZ4HC 594 bool "LZ4HC" 595 select CRYPTO_LZ4HC 596 help 597 Use the LZ4HC algorithm as the default compression algorithm. 598 599config ZSWAP_COMPRESSOR_DEFAULT_ZSTD 600 bool "zstd" 601 select CRYPTO_ZSTD 602 help 603 Use the zstd algorithm as the default compression algorithm. 604endchoice 605 606config ZSWAP_COMPRESSOR_DEFAULT 607 string 608 depends on ZSWAP 609 default "deflate" if ZSWAP_COMPRESSOR_DEFAULT_DEFLATE 610 default "lzo" if ZSWAP_COMPRESSOR_DEFAULT_LZO 611 default "842" if ZSWAP_COMPRESSOR_DEFAULT_842 612 default "lz4" if ZSWAP_COMPRESSOR_DEFAULT_LZ4 613 default "lz4hc" if ZSWAP_COMPRESSOR_DEFAULT_LZ4HC 614 default "zstd" if ZSWAP_COMPRESSOR_DEFAULT_ZSTD 615 default "" 616 617choice 618 prompt "Compressed cache for swap pages default allocator" 619 depends on ZSWAP 620 default ZSWAP_ZPOOL_DEFAULT_ZBUD 621 help 622 Selects the default allocator for the compressed cache for 623 swap pages. 624 The default is 'zbud' for compatibility, however please do 625 read the description of each of the allocators below before 626 making a right choice. 627 628 The selection made here can be overridden by using the kernel 629 command line 'zswap.zpool=' option. 630 631config ZSWAP_ZPOOL_DEFAULT_ZBUD 632 bool "zbud" 633 select ZBUD 634 help 635 Use the zbud allocator as the default allocator. 636 637config ZSWAP_ZPOOL_DEFAULT_Z3FOLD 638 bool "z3fold" 639 select Z3FOLD 640 help 641 Use the z3fold allocator as the default allocator. 642 643config ZSWAP_ZPOOL_DEFAULT_ZSMALLOC 644 bool "zsmalloc" 645 select ZSMALLOC 646 help 647 Use the zsmalloc allocator as the default allocator. 648endchoice 649 650config ZSWAP_ZPOOL_DEFAULT 651 string 652 depends on ZSWAP 653 default "zbud" if ZSWAP_ZPOOL_DEFAULT_ZBUD 654 default "z3fold" if ZSWAP_ZPOOL_DEFAULT_Z3FOLD 655 default "zsmalloc" if ZSWAP_ZPOOL_DEFAULT_ZSMALLOC 656 default "" 657 658config ZSWAP_DEFAULT_ON 659 bool "Enable the compressed cache for swap pages by default" 660 depends on ZSWAP 661 help 662 If selected, the compressed cache for swap pages will be enabled 663 at boot, otherwise it will be disabled. 664 665 The selection made here can be overridden by using the kernel 666 command line 'zswap.enabled=' option. 667 |
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| 552config ZPOOL 553 tristate "Common API for compressed memory storage" 554 help 555 Compressed memory storage API. This allows using either zbud or 556 zsmalloc. 557 558config ZBUD 559 tristate "Low (Up to 2x) density storage for compressed pages" --- 190 unchanged lines hidden --- | 668config ZPOOL 669 tristate "Common API for compressed memory storage" 670 help 671 Compressed memory storage API. This allows using either zbud or 672 zsmalloc. 673 674config ZBUD 675 tristate "Low (Up to 2x) density storage for compressed pages" --- 190 unchanged lines hidden --- |