1what: /sys/kernel/mm/damon/ 2Date: Mar 2022 3Contact: SeongJae Park <sj@kernel.org> 4Description: Interface for Data Access MONitoring (DAMON). Contains files 5 for controlling DAMON. For more details on DAMON itself, 6 please refer to Documentation/admin-guide/mm/damon/index.rst. 7 8What: /sys/kernel/mm/damon/admin/ 9Date: Mar 2022 10Contact: SeongJae Park <sj@kernel.org> 11Description: Interface for privileged users of DAMON. Contains files for 12 controlling DAMON that aimed to be used by privileged users. 13 14What: /sys/kernel/mm/damon/admin/kdamonds/nr_kdamonds 15Date: Mar 2022 16Contact: SeongJae Park <sj@kernel.org> 17Description: Writing a number 'N' to this file creates the number of 18 directories for controlling each DAMON worker thread (kdamond) 19 named '0' to 'N-1' under the kdamonds/ directory. 20 21What: /sys/kernel/mm/damon/admin/kdamonds/<K>/state 22Date: Mar 2022 23Contact: SeongJae Park <sj@kernel.org> 24Description: Writing 'on' or 'off' to this file makes the kdamond starts or 25 stops, respectively. Reading the file returns the keywords 26 based on the current status. Writing 'commit' to this file 27 makes the kdamond reads the user inputs in the sysfs files 28 except 'state' again. Writing 'update_schemes_stats' to the 29 file updates contents of schemes stats files of the kdamond. 30 Writing 'update_schemes_tried_regions' to the file updates 31 contents of 'tried_regions' directory of every scheme directory 32 of this kdamond. Writing 'update_schemes_tried_bytes' to the 33 file updates only '.../tried_regions/total_bytes' files of this 34 kdamond. Writing 'clear_schemes_tried_regions' to the file 35 removes contents of the 'tried_regions' directory. 36 37What: /sys/kernel/mm/damon/admin/kdamonds/<K>/pid 38Date: Mar 2022 39Contact: SeongJae Park <sj@kernel.org> 40Description: Reading this file returns the pid of the kdamond if it is 41 running. 42 43What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/nr_contexts 44Date: Mar 2022 45Contact: SeongJae Park <sj@kernel.org> 46Description: Writing a number 'N' to this file creates the number of 47 directories for controlling each DAMON context named '0' to 48 'N-1' under the contexts/ directory. 49 50What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/avail_operations 51Date: Apr 2022 52Contact: SeongJae Park <sj@kernel.org> 53Description: Reading this file returns the available monitoring operations 54 sets on the currently running kernel. 55 56What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/operations 57Date: Mar 2022 58Contact: SeongJae Park <sj@kernel.org> 59Description: Writing a keyword for a monitoring operations set ('vaddr' for 60 virtual address spaces monitoring, 'fvaddr' for fixed virtual 61 address ranges monitoring, and 'paddr' for the physical address 62 space monitoring) to this file makes the context to use the 63 operations set. Reading the file returns the keyword for the 64 operations set the context is set to use. 65 66 Note that only the operations sets that listed in 67 'avail_operations' file are valid inputs. 68 69What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/monitoring_attrs/intervals/sample_us 70Date: Mar 2022 71Contact: SeongJae Park <sj@kernel.org> 72Description: Writing a value to this file sets the sampling interval of the 73 DAMON context in microseconds as the value. Reading this file 74 returns the value. 75 76What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/monitoring_attrs/intervals/aggr_us 77Date: Mar 2022 78Contact: SeongJae Park <sj@kernel.org> 79Description: Writing a value to this file sets the aggregation interval of 80 the DAMON context in microseconds as the value. Reading this 81 file returns the value. 82 83What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/monitoring_attrs/intervals/update_us 84Date: Mar 2022 85Contact: SeongJae Park <sj@kernel.org> 86Description: Writing a value to this file sets the update interval of the 87 DAMON context in microseconds as the value. Reading this file 88 returns the value. 89 90What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/monitoring_attrs/nr_regions/min 91 92WDate: Mar 2022 93Contact: SeongJae Park <sj@kernel.org> 94Description: Writing a value to this file sets the minimum number of 95 monitoring regions of the DAMON context as the value. Reading 96 this file returns the value. 97 98What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/monitoring_attrs/nr_regions/max 99Date: Mar 2022 100Contact: SeongJae Park <sj@kernel.org> 101Description: Writing a value to this file sets the maximum number of 102 monitoring regions of the DAMON context as the value. Reading 103 this file returns the value. 104 105What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/targets/nr_targets 106Date: Mar 2022 107Contact: SeongJae Park <sj@kernel.org> 108Description: Writing a number 'N' to this file creates the number of 109 directories for controlling each DAMON target of the context 110 named '0' to 'N-1' under the contexts/ directory. 111 112What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/targets/<T>/pid_target 113Date: Mar 2022 114Contact: SeongJae Park <sj@kernel.org> 115Description: Writing to and reading from this file sets and gets the pid of 116 the target process if the context is for virtual address spaces 117 monitoring, respectively. 118 119What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/targets/<T>/regions/nr_regions 120Date: Mar 2022 121Contact: SeongJae Park <sj@kernel.org> 122Description: Writing a number 'N' to this file creates the number of 123 directories for setting each DAMON target memory region of the 124 context named '0' to 'N-1' under the regions/ directory. In 125 case of the virtual address space monitoring, DAMON 126 automatically sets the target memory region based on the target 127 processes' mappings. 128 129What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/targets/<T>/regions/<R>/start 130Date: Mar 2022 131Contact: SeongJae Park <sj@kernel.org> 132Description: Writing to and reading from this file sets and gets the start 133 address of the monitoring region. 134 135What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/targets/<T>/regions/<R>/end 136Date: Mar 2022 137Contact: SeongJae Park <sj@kernel.org> 138Description: Writing to and reading from this file sets and gets the end 139 address of the monitoring region. 140 141What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/nr_schemes 142Date: Mar 2022 143Contact: SeongJae Park <sj@kernel.org> 144Description: Writing a number 'N' to this file creates the number of 145 directories for controlling each DAMON-based operation scheme 146 of the context named '0' to 'N-1' under the schemes/ directory. 147 148What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/action 149Date: Mar 2022 150Contact: SeongJae Park <sj@kernel.org> 151Description: Writing to and reading from this file sets and gets the action 152 of the scheme. 153 154What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/access_pattern/sz/min 155Date: Mar 2022 156Contact: SeongJae Park <sj@kernel.org> 157Description: Writing to and reading from this file sets and gets the mimimum 158 size of the scheme's target regions in bytes. 159 160What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/access_pattern/sz/max 161Date: Mar 2022 162Contact: SeongJae Park <sj@kernel.org> 163Description: Writing to and reading from this file sets and gets the maximum 164 size of the scheme's target regions in bytes. 165 166What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/access_pattern/nr_accesses/min 167Date: Mar 2022 168Contact: SeongJae Park <sj@kernel.org> 169Description: Writing to and reading from this file sets and gets the manimum 170 'nr_accesses' of the scheme's target regions. 171 172What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/access_pattern/nr_accesses/max 173Date: Mar 2022 174Contact: SeongJae Park <sj@kernel.org> 175Description: Writing to and reading from this file sets and gets the maximum 176 'nr_accesses' of the scheme's target regions. 177 178What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/access_pattern/age/min 179Date: Mar 2022 180Contact: SeongJae Park <sj@kernel.org> 181Description: Writing to and reading from this file sets and gets the minimum 182 'age' of the scheme's target regions. 183 184What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/access_pattern/age/max 185Date: Mar 2022 186Contact: SeongJae Park <sj@kernel.org> 187Description: Writing to and reading from this file sets and gets the maximum 188 'age' of the scheme's target regions. 189 190What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/quotas/ms 191Date: Mar 2022 192Contact: SeongJae Park <sj@kernel.org> 193Description: Writing to and reading from this file sets and gets the time 194 quota of the scheme in milliseconds. 195 196What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/quotas/bytes 197Date: Mar 2022 198Contact: SeongJae Park <sj@kernel.org> 199Description: Writing to and reading from this file sets and gets the size 200 quota of the scheme in bytes. 201 202What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/quotas/reset_interval_ms 203Date: Mar 2022 204Contact: SeongJae Park <sj@kernel.org> 205Description: Writing to and reading from this file sets and gets the quotas 206 charge reset interval of the scheme in milliseconds. 207 208What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/quotas/weights/sz_permil 209Date: Mar 2022 210Contact: SeongJae Park <sj@kernel.org> 211Description: Writing to and reading from this file sets and gets the 212 under-quota limit regions prioritization weight for 'size' in 213 permil. 214 215What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/quotas/weights/nr_accesses_permil 216Date: Mar 2022 217Contact: SeongJae Park <sj@kernel.org> 218Description: Writing to and reading from this file sets and gets the 219 under-quota limit regions prioritization weight for 220 'nr_accesses' in permil. 221 222What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/quotas/weights/age_permil 223Date: Mar 2022 224Contact: SeongJae Park <sj@kernel.org> 225Description: Writing to and reading from this file sets and gets the 226 under-quota limit regions prioritization weight for 'age' in 227 permil. 228 229What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/watermarks/metric 230Date: Mar 2022 231Contact: SeongJae Park <sj@kernel.org> 232Description: Writing to and reading from this file sets and gets the metric 233 of the watermarks for the scheme. The writable/readable 234 keywords for this file are 'none' for disabling the watermarks 235 feature, or 'free_mem_rate' for the system's global free memory 236 rate in permil. 237 238What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/watermarks/interval_us 239Date: Mar 2022 240Contact: SeongJae Park <sj@kernel.org> 241Description: Writing to and reading from this file sets and gets the metric 242 check interval of the watermarks for the scheme in 243 microseconds. 244 245What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/watermarks/high 246Date: Mar 2022 247Contact: SeongJae Park <sj@kernel.org> 248Description: Writing to and reading from this file sets and gets the high 249 watermark of the scheme in permil. 250 251What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/watermarks/mid 252Date: Mar 2022 253Contact: SeongJae Park <sj@kernel.org> 254Description: Writing to and reading from this file sets and gets the mid 255 watermark of the scheme in permil. 256 257What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/watermarks/low 258Date: Mar 2022 259Contact: SeongJae Park <sj@kernel.org> 260Description: Writing to and reading from this file sets and gets the low 261 watermark of the scheme in permil. 262 263What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/filters/nr_filters 264Date: Dec 2022 265Contact: SeongJae Park <sj@kernel.org> 266Description: Writing a number 'N' to this file creates the number of 267 directories for setting filters of the scheme named '0' to 268 'N-1' under the filters/ directory. 269 270What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/filters/<F>/type 271Date: Dec 2022 272Contact: SeongJae Park <sj@kernel.org> 273Description: Writing to and reading from this file sets and gets the type of 274 the memory of the interest. 'anon' for anonymous pages, 275 'memcg' for specific memory cgroup, or 'addr' for address range 276 (an open-ended interval) can be written and read. 277 278What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/filters/<F>/memcg_path 279Date: Dec 2022 280Contact: SeongJae Park <sj@kernel.org> 281Description: If 'memcg' is written to the 'type' file, writing to and 282 reading from this file sets and gets the path to the memory 283 cgroup of the interest. 284 285What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/filters/<F>/addr_start 286Date: Jul 2023 287Contact: SeongJae Park <sj@kernel.org> 288Description: If 'addr' is written to the 'type' file, writing to or reading 289 from this file sets or gets the start address of the address 290 range for the filter. 291 292What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/filters/<F>/addr_end 293Date: Jul 2023 294Contact: SeongJae Park <sj@kernel.org> 295Description: If 'addr' is written to the 'type' file, writing to or reading 296 from this file sets or gets the end address of the address 297 range for the filter. 298 299 300What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/filters/<F>/matching 301Date: Dec 2022 302Contact: SeongJae Park <sj@kernel.org> 303Description: Writing 'Y' or 'N' to this file sets whether to filter out 304 pages that do or do not match to the 'type' and 'memcg_path', 305 respectively. Filter out means the action of the scheme will 306 not be applied to. 307 308What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/stats/nr_tried 309Date: Mar 2022 310Contact: SeongJae Park <sj@kernel.org> 311Description: Reading this file returns the number of regions that the action 312 of the scheme has tried to be applied. 313 314What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/stats/sz_tried 315Date: Mar 2022 316Contact: SeongJae Park <sj@kernel.org> 317Description: Reading this file returns the total size of regions that the 318 action of the scheme has tried to be applied in bytes. 319 320What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/stats/nr_applied 321Date: Mar 2022 322Contact: SeongJae Park <sj@kernel.org> 323Description: Reading this file returns the number of regions that the action 324 of the scheme has successfully applied. 325 326What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/stats/sz_applied 327Date: Mar 2022 328Contact: SeongJae Park <sj@kernel.org> 329Description: Reading this file returns the total size of regions that the 330 action of the scheme has successfully applied in bytes. 331 332What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/stats/qt_exceeds 333Date: Mar 2022 334Contact: SeongJae Park <sj@kernel.org> 335Description: Reading this file returns the number of the exceed events of 336 the scheme's quotas. 337 338What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/tried_regions/total_bytes 339Date: Jul 2023 340Contact: SeongJae Park <sj@kernel.org> 341Description: Reading this file returns the total amount of memory that 342 corresponding DAMON-based Operation Scheme's action has tried 343 to be applied. 344 345What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/tried_regions/<R>/start 346Date: Oct 2022 347Contact: SeongJae Park <sj@kernel.org> 348Description: Reading this file returns the start address of a memory region 349 that corresponding DAMON-based Operation Scheme's action has 350 tried to be applied. 351 352What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/tried_regions/<R>/end 353Date: Oct 2022 354Contact: SeongJae Park <sj@kernel.org> 355Description: Reading this file returns the end address of a memory region 356 that corresponding DAMON-based Operation Scheme's action has 357 tried to be applied. 358 359What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/tried_regions/<R>/nr_accesses 360Date: Oct 2022 361Contact: SeongJae Park <sj@kernel.org> 362Description: Reading this file returns the 'nr_accesses' of a memory region 363 that corresponding DAMON-based Operation Scheme's action has 364 tried to be applied. 365 366What: /sys/kernel/mm/damon/admin/kdamonds/<K>/contexts/<C>/schemes/<S>/tried_regions/<R>/age 367Date: Oct 2022 368Contact: SeongJae Park <sj@kernel.org> 369Description: Reading this file returns the 'age' of a memory region that 370 corresponding DAMON-based Operation Scheme's action has tried 371 to be applied. 372