1 # SPDX-License-Identifier: GPL-2.0-only 2 3 menu "Data Access Monitoring" 4 5 config DAMON 6 bool "DAMON: Data Access Monitoring Framework" 7 help 8 This builds a framework that allows kernel subsystems to monitor 9 access frequency of each memory region. The information can be useful 10 for performance-centric DRAM level memory management. 11 12 See https://www.kernel.org/doc/html/latest/mm/damon/index.html for 13 more information. 14 15 config DAMON_KUNIT_TEST 16 bool "Test for damon" if !KUNIT_ALL_TESTS 17 depends on DAMON && KUNIT=y 18 default KUNIT_ALL_TESTS 19 help 20 This builds the DAMON Kunit test suite. 21 22 For more information on KUnit and unit tests in general, please refer 23 to the KUnit documentation. 24 25 If unsure, say N. 26 27 config DAMON_VADDR 28 bool "Data access monitoring operations for virtual address spaces" 29 depends on DAMON && MMU 30 select PAGE_IDLE_FLAG 31 help 32 This builds the default data access monitoring operations for DAMON 33 that work for virtual address spaces. 34 35 config DAMON_PADDR 36 bool "Data access monitoring operations for the physical address space" 37 depends on DAMON && MMU 38 select PAGE_IDLE_FLAG 39 help 40 This builds the default data access monitoring operations for DAMON 41 that works for the physical address space. 42 43 config DAMON_VADDR_KUNIT_TEST 44 bool "Test for DAMON operations" if !KUNIT_ALL_TESTS 45 depends on DAMON_VADDR && KUNIT=y 46 default KUNIT_ALL_TESTS 47 help 48 This builds the DAMON virtual addresses operations Kunit test suite. 49 50 For more information on KUnit and unit tests in general, please refer 51 to the KUnit documentation. 52 53 If unsure, say N. 54 55 config DAMON_SYSFS 56 bool "DAMON sysfs interface" 57 depends on DAMON && SYSFS 58 help 59 This builds the sysfs interface for DAMON. The user space can use 60 the interface for arbitrary data access monitoring. 61 62 config DAMON_SYSFS_KUNIT_TEST 63 bool "Test for damon debugfs interface" if !KUNIT_ALL_TESTS 64 depends on DAMON_SYSFS && KUNIT=y 65 default KUNIT_ALL_TESTS 66 help 67 This builds the DAMON sysfs interface Kunit test suite. 68 69 For more information on KUnit and unit tests in general, please refer 70 to the KUnit documentation. 71 72 If unsure, say N. 73 74 config DAMON_DBGFS_DEPRECATED 75 bool "DAMON debugfs interface (DEPRECATED!)" 76 depends on DAMON_VADDR && DAMON_PADDR && DEBUG_FS 77 help 78 This builds the debugfs interface for DAMON. The user space admins 79 can use the interface for arbitrary data access monitoring. 80 81 If unsure, say N. 82 83 This is deprecated, so users should move to the sysfs interface 84 (DAMON_SYSFS). If you depend on this and cannot move, please report 85 your usecase to damon@lists.linux.dev and linux-mm@kvack.org. 86 87 config DAMON_DBGFS 88 bool 89 default y 90 depends on DAMON_DBGFS_DEPRECATED 91 92 config DAMON_DBGFS_KUNIT_TEST 93 bool "Test for damon debugfs interface" if !KUNIT_ALL_TESTS 94 depends on DAMON_DBGFS && KUNIT=y 95 default KUNIT_ALL_TESTS 96 help 97 This builds the DAMON debugfs interface Kunit test suite. 98 99 For more information on KUnit and unit tests in general, please refer 100 to the KUnit documentation. 101 102 If unsure, say N. 103 104 config DAMON_RECLAIM 105 bool "Build DAMON-based reclaim (DAMON_RECLAIM)" 106 depends on DAMON_PADDR 107 help 108 This builds the DAMON-based reclamation subsystem. It finds pages 109 that not accessed for a long time (cold) using DAMON and reclaim 110 those. 111 112 This is suggested to be used as a proactive and lightweight 113 reclamation under light memory pressure, while the traditional page 114 scanning-based reclamation is used for heavy pressure. 115 116 config DAMON_LRU_SORT 117 bool "Build DAMON-based LRU-lists sorting (DAMON_LRU_SORT)" 118 depends on DAMON_PADDR 119 help 120 This builds the DAMON-based LRU-lists sorting subsystem. It tries to 121 protect frequently accessed (hot) pages while rarely accessed (cold) 122 pages reclaimed first under memory pressure. 123 124 endmenu 125