1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * DAMON sysfs Interface 4 * 5 * Copyright (c) 2022 SeongJae Park <sj@kernel.org> 6 */ 7 8 #include <linux/slab.h> 9 10 #include "sysfs-common.h" 11 12 /* 13 * scheme region directory 14 */ 15 16 struct damon_sysfs_scheme_region { 17 struct kobject kobj; 18 struct damon_addr_range ar; 19 unsigned int nr_accesses; 20 unsigned int age; 21 struct list_head list; 22 }; 23 24 static struct damon_sysfs_scheme_region *damon_sysfs_scheme_region_alloc( 25 struct damon_region *region) 26 { 27 struct damon_sysfs_scheme_region *sysfs_region = kmalloc( 28 sizeof(*sysfs_region), GFP_KERNEL); 29 30 if (!sysfs_region) 31 return NULL; 32 sysfs_region->kobj = (struct kobject){}; 33 sysfs_region->ar = region->ar; 34 sysfs_region->nr_accesses = region->nr_accesses_bp / 10000; 35 sysfs_region->age = region->age; 36 INIT_LIST_HEAD(&sysfs_region->list); 37 return sysfs_region; 38 } 39 40 static ssize_t start_show(struct kobject *kobj, struct kobj_attribute *attr, 41 char *buf) 42 { 43 struct damon_sysfs_scheme_region *region = container_of(kobj, 44 struct damon_sysfs_scheme_region, kobj); 45 46 return sysfs_emit(buf, "%lu\n", region->ar.start); 47 } 48 49 static ssize_t end_show(struct kobject *kobj, struct kobj_attribute *attr, 50 char *buf) 51 { 52 struct damon_sysfs_scheme_region *region = container_of(kobj, 53 struct damon_sysfs_scheme_region, kobj); 54 55 return sysfs_emit(buf, "%lu\n", region->ar.end); 56 } 57 58 static ssize_t nr_accesses_show(struct kobject *kobj, 59 struct kobj_attribute *attr, char *buf) 60 { 61 struct damon_sysfs_scheme_region *region = container_of(kobj, 62 struct damon_sysfs_scheme_region, kobj); 63 64 return sysfs_emit(buf, "%u\n", region->nr_accesses); 65 } 66 67 static ssize_t age_show(struct kobject *kobj, struct kobj_attribute *attr, 68 char *buf) 69 { 70 struct damon_sysfs_scheme_region *region = container_of(kobj, 71 struct damon_sysfs_scheme_region, kobj); 72 73 return sysfs_emit(buf, "%u\n", region->age); 74 } 75 76 static void damon_sysfs_scheme_region_release(struct kobject *kobj) 77 { 78 struct damon_sysfs_scheme_region *region = container_of(kobj, 79 struct damon_sysfs_scheme_region, kobj); 80 81 list_del(®ion->list); 82 kfree(region); 83 } 84 85 static struct kobj_attribute damon_sysfs_scheme_region_start_attr = 86 __ATTR_RO_MODE(start, 0400); 87 88 static struct kobj_attribute damon_sysfs_scheme_region_end_attr = 89 __ATTR_RO_MODE(end, 0400); 90 91 static struct kobj_attribute damon_sysfs_scheme_region_nr_accesses_attr = 92 __ATTR_RO_MODE(nr_accesses, 0400); 93 94 static struct kobj_attribute damon_sysfs_scheme_region_age_attr = 95 __ATTR_RO_MODE(age, 0400); 96 97 static struct attribute *damon_sysfs_scheme_region_attrs[] = { 98 &damon_sysfs_scheme_region_start_attr.attr, 99 &damon_sysfs_scheme_region_end_attr.attr, 100 &damon_sysfs_scheme_region_nr_accesses_attr.attr, 101 &damon_sysfs_scheme_region_age_attr.attr, 102 NULL, 103 }; 104 ATTRIBUTE_GROUPS(damon_sysfs_scheme_region); 105 106 static const struct kobj_type damon_sysfs_scheme_region_ktype = { 107 .release = damon_sysfs_scheme_region_release, 108 .sysfs_ops = &kobj_sysfs_ops, 109 .default_groups = damon_sysfs_scheme_region_groups, 110 }; 111 112 /* 113 * scheme regions directory 114 */ 115 116 /* 117 * enum damos_sysfs_regions_upd_status - Represent DAMOS tried regions update 118 * status 119 * @DAMOS_TRIED_REGIONS_UPD_IDLE: Waiting for next request. 120 * @DAMOS_TRIED_REGIONS_UPD_STARTED: Update started. 121 * @DAMOS_TRIED_REGIONS_UPD_FINISHED: Update finished. 122 * 123 * Each DAMON-based operation scheme (&struct damos) has its own apply 124 * interval, and we need to expose the scheme tried regions based on only 125 * single snapshot. For this, we keep the tried regions update status for each 126 * scheme. The status becomes 'idle' at the beginning. 127 * 128 * Once the tried regions update request is received, the request handling 129 * start function (damon_sysfs_scheme_update_regions_start()) sets the status 130 * of all schemes as 'idle' again, and register ->before_damos_apply() and 131 * ->after_sampling() callbacks. 132 * 133 * Then, the first followup ->before_damos_apply() callback 134 * (damon_sysfs_before_damos_apply()) sets the status 'started'. The first 135 * ->after_sampling() callback (damon_sysfs_after_sampling()) after the call 136 * is called only after the scheme is completely applied 137 * to the given snapshot. Hence the callback knows the situation by showing 138 * 'started' status, and sets the status as 'finished'. Then, 139 * damon_sysfs_before_damos_apply() understands the situation by showing the 140 * 'finished' status and do nothing. 141 * 142 * If DAMOS is not applied to any region due to any reasons including the 143 * access pattern, the watermarks, the quotas, and the filters, 144 * ->before_damos_apply() will not be called back. Until the situation is 145 * changed, the update will not be finished. To avoid this, 146 * damon_sysfs_after_sampling() set the status as 'finished' if more than two 147 * apply intervals of the scheme is passed while the state is 'idle'. 148 * 149 * Finally, the tried regions request handling finisher function 150 * (damon_sysfs_schemes_update_regions_stop()) unregisters the callbacks. 151 */ 152 enum damos_sysfs_regions_upd_status { 153 DAMOS_TRIED_REGIONS_UPD_IDLE, 154 DAMOS_TRIED_REGIONS_UPD_STARTED, 155 DAMOS_TRIED_REGIONS_UPD_FINISHED, 156 }; 157 158 struct damon_sysfs_scheme_regions { 159 struct kobject kobj; 160 struct list_head regions_list; 161 int nr_regions; 162 unsigned long total_bytes; 163 enum damos_sysfs_regions_upd_status upd_status; 164 unsigned long upd_timeout_jiffies; 165 }; 166 167 static struct damon_sysfs_scheme_regions * 168 damon_sysfs_scheme_regions_alloc(void) 169 { 170 struct damon_sysfs_scheme_regions *regions = kmalloc(sizeof(*regions), 171 GFP_KERNEL); 172 173 if (!regions) 174 return NULL; 175 176 regions->kobj = (struct kobject){}; 177 INIT_LIST_HEAD(®ions->regions_list); 178 regions->nr_regions = 0; 179 regions->total_bytes = 0; 180 regions->upd_status = DAMOS_TRIED_REGIONS_UPD_IDLE; 181 return regions; 182 } 183 184 static ssize_t total_bytes_show(struct kobject *kobj, 185 struct kobj_attribute *attr, char *buf) 186 { 187 struct damon_sysfs_scheme_regions *regions = container_of(kobj, 188 struct damon_sysfs_scheme_regions, kobj); 189 190 return sysfs_emit(buf, "%lu\n", regions->total_bytes); 191 } 192 193 static void damon_sysfs_scheme_regions_rm_dirs( 194 struct damon_sysfs_scheme_regions *regions) 195 { 196 struct damon_sysfs_scheme_region *r, *next; 197 198 list_for_each_entry_safe(r, next, ®ions->regions_list, list) { 199 /* release function deletes it from the list */ 200 kobject_put(&r->kobj); 201 regions->nr_regions--; 202 } 203 } 204 205 static void damon_sysfs_scheme_regions_release(struct kobject *kobj) 206 { 207 kfree(container_of(kobj, struct damon_sysfs_scheme_regions, kobj)); 208 } 209 210 static struct kobj_attribute damon_sysfs_scheme_regions_total_bytes_attr = 211 __ATTR_RO_MODE(total_bytes, 0400); 212 213 static struct attribute *damon_sysfs_scheme_regions_attrs[] = { 214 &damon_sysfs_scheme_regions_total_bytes_attr.attr, 215 NULL, 216 }; 217 ATTRIBUTE_GROUPS(damon_sysfs_scheme_regions); 218 219 static const struct kobj_type damon_sysfs_scheme_regions_ktype = { 220 .release = damon_sysfs_scheme_regions_release, 221 .sysfs_ops = &kobj_sysfs_ops, 222 .default_groups = damon_sysfs_scheme_regions_groups, 223 }; 224 225 /* 226 * schemes/stats directory 227 */ 228 229 struct damon_sysfs_stats { 230 struct kobject kobj; 231 unsigned long nr_tried; 232 unsigned long sz_tried; 233 unsigned long nr_applied; 234 unsigned long sz_applied; 235 unsigned long qt_exceeds; 236 }; 237 238 static struct damon_sysfs_stats *damon_sysfs_stats_alloc(void) 239 { 240 return kzalloc(sizeof(struct damon_sysfs_stats), GFP_KERNEL); 241 } 242 243 static ssize_t nr_tried_show(struct kobject *kobj, struct kobj_attribute *attr, 244 char *buf) 245 { 246 struct damon_sysfs_stats *stats = container_of(kobj, 247 struct damon_sysfs_stats, kobj); 248 249 return sysfs_emit(buf, "%lu\n", stats->nr_tried); 250 } 251 252 static ssize_t sz_tried_show(struct kobject *kobj, struct kobj_attribute *attr, 253 char *buf) 254 { 255 struct damon_sysfs_stats *stats = container_of(kobj, 256 struct damon_sysfs_stats, kobj); 257 258 return sysfs_emit(buf, "%lu\n", stats->sz_tried); 259 } 260 261 static ssize_t nr_applied_show(struct kobject *kobj, 262 struct kobj_attribute *attr, char *buf) 263 { 264 struct damon_sysfs_stats *stats = container_of(kobj, 265 struct damon_sysfs_stats, kobj); 266 267 return sysfs_emit(buf, "%lu\n", stats->nr_applied); 268 } 269 270 static ssize_t sz_applied_show(struct kobject *kobj, 271 struct kobj_attribute *attr, char *buf) 272 { 273 struct damon_sysfs_stats *stats = container_of(kobj, 274 struct damon_sysfs_stats, kobj); 275 276 return sysfs_emit(buf, "%lu\n", stats->sz_applied); 277 } 278 279 static ssize_t qt_exceeds_show(struct kobject *kobj, 280 struct kobj_attribute *attr, char *buf) 281 { 282 struct damon_sysfs_stats *stats = container_of(kobj, 283 struct damon_sysfs_stats, kobj); 284 285 return sysfs_emit(buf, "%lu\n", stats->qt_exceeds); 286 } 287 288 static void damon_sysfs_stats_release(struct kobject *kobj) 289 { 290 kfree(container_of(kobj, struct damon_sysfs_stats, kobj)); 291 } 292 293 static struct kobj_attribute damon_sysfs_stats_nr_tried_attr = 294 __ATTR_RO_MODE(nr_tried, 0400); 295 296 static struct kobj_attribute damon_sysfs_stats_sz_tried_attr = 297 __ATTR_RO_MODE(sz_tried, 0400); 298 299 static struct kobj_attribute damon_sysfs_stats_nr_applied_attr = 300 __ATTR_RO_MODE(nr_applied, 0400); 301 302 static struct kobj_attribute damon_sysfs_stats_sz_applied_attr = 303 __ATTR_RO_MODE(sz_applied, 0400); 304 305 static struct kobj_attribute damon_sysfs_stats_qt_exceeds_attr = 306 __ATTR_RO_MODE(qt_exceeds, 0400); 307 308 static struct attribute *damon_sysfs_stats_attrs[] = { 309 &damon_sysfs_stats_nr_tried_attr.attr, 310 &damon_sysfs_stats_sz_tried_attr.attr, 311 &damon_sysfs_stats_nr_applied_attr.attr, 312 &damon_sysfs_stats_sz_applied_attr.attr, 313 &damon_sysfs_stats_qt_exceeds_attr.attr, 314 NULL, 315 }; 316 ATTRIBUTE_GROUPS(damon_sysfs_stats); 317 318 static const struct kobj_type damon_sysfs_stats_ktype = { 319 .release = damon_sysfs_stats_release, 320 .sysfs_ops = &kobj_sysfs_ops, 321 .default_groups = damon_sysfs_stats_groups, 322 }; 323 324 /* 325 * filter directory 326 */ 327 328 struct damon_sysfs_scheme_filter { 329 struct kobject kobj; 330 enum damos_filter_type type; 331 bool matching; 332 char *memcg_path; 333 struct damon_addr_range addr_range; 334 int target_idx; 335 }; 336 337 static struct damon_sysfs_scheme_filter *damon_sysfs_scheme_filter_alloc(void) 338 { 339 return kzalloc(sizeof(struct damon_sysfs_scheme_filter), GFP_KERNEL); 340 } 341 342 /* Should match with enum damos_filter_type */ 343 static const char * const damon_sysfs_scheme_filter_type_strs[] = { 344 "anon", 345 "memcg", 346 "addr", 347 "target", 348 }; 349 350 static ssize_t type_show(struct kobject *kobj, 351 struct kobj_attribute *attr, char *buf) 352 { 353 struct damon_sysfs_scheme_filter *filter = container_of(kobj, 354 struct damon_sysfs_scheme_filter, kobj); 355 356 return sysfs_emit(buf, "%s\n", 357 damon_sysfs_scheme_filter_type_strs[filter->type]); 358 } 359 360 static ssize_t type_store(struct kobject *kobj, 361 struct kobj_attribute *attr, const char *buf, size_t count) 362 { 363 struct damon_sysfs_scheme_filter *filter = container_of(kobj, 364 struct damon_sysfs_scheme_filter, kobj); 365 enum damos_filter_type type; 366 ssize_t ret = -EINVAL; 367 368 for (type = 0; type < NR_DAMOS_FILTER_TYPES; type++) { 369 if (sysfs_streq(buf, damon_sysfs_scheme_filter_type_strs[ 370 type])) { 371 filter->type = type; 372 ret = count; 373 break; 374 } 375 } 376 return ret; 377 } 378 379 static ssize_t matching_show(struct kobject *kobj, 380 struct kobj_attribute *attr, char *buf) 381 { 382 struct damon_sysfs_scheme_filter *filter = container_of(kobj, 383 struct damon_sysfs_scheme_filter, kobj); 384 385 return sysfs_emit(buf, "%c\n", filter->matching ? 'Y' : 'N'); 386 } 387 388 static ssize_t matching_store(struct kobject *kobj, 389 struct kobj_attribute *attr, const char *buf, size_t count) 390 { 391 struct damon_sysfs_scheme_filter *filter = container_of(kobj, 392 struct damon_sysfs_scheme_filter, kobj); 393 bool matching; 394 int err = kstrtobool(buf, &matching); 395 396 if (err) 397 return err; 398 399 filter->matching = matching; 400 return count; 401 } 402 403 static ssize_t memcg_path_show(struct kobject *kobj, 404 struct kobj_attribute *attr, char *buf) 405 { 406 struct damon_sysfs_scheme_filter *filter = container_of(kobj, 407 struct damon_sysfs_scheme_filter, kobj); 408 409 return sysfs_emit(buf, "%s\n", 410 filter->memcg_path ? filter->memcg_path : ""); 411 } 412 413 static ssize_t memcg_path_store(struct kobject *kobj, 414 struct kobj_attribute *attr, const char *buf, size_t count) 415 { 416 struct damon_sysfs_scheme_filter *filter = container_of(kobj, 417 struct damon_sysfs_scheme_filter, kobj); 418 char *path = kmalloc(sizeof(*path) * (count + 1), GFP_KERNEL); 419 420 if (!path) 421 return -ENOMEM; 422 423 strscpy(path, buf, count + 1); 424 filter->memcg_path = path; 425 return count; 426 } 427 428 static ssize_t addr_start_show(struct kobject *kobj, 429 struct kobj_attribute *attr, char *buf) 430 { 431 struct damon_sysfs_scheme_filter *filter = container_of(kobj, 432 struct damon_sysfs_scheme_filter, kobj); 433 434 return sysfs_emit(buf, "%lu\n", filter->addr_range.start); 435 } 436 437 static ssize_t addr_start_store(struct kobject *kobj, 438 struct kobj_attribute *attr, const char *buf, size_t count) 439 { 440 struct damon_sysfs_scheme_filter *filter = container_of(kobj, 441 struct damon_sysfs_scheme_filter, kobj); 442 int err = kstrtoul(buf, 0, &filter->addr_range.start); 443 444 return err ? err : count; 445 } 446 447 static ssize_t addr_end_show(struct kobject *kobj, 448 struct kobj_attribute *attr, char *buf) 449 { 450 struct damon_sysfs_scheme_filter *filter = container_of(kobj, 451 struct damon_sysfs_scheme_filter, kobj); 452 453 return sysfs_emit(buf, "%lu\n", filter->addr_range.end); 454 } 455 456 static ssize_t addr_end_store(struct kobject *kobj, 457 struct kobj_attribute *attr, const char *buf, size_t count) 458 { 459 struct damon_sysfs_scheme_filter *filter = container_of(kobj, 460 struct damon_sysfs_scheme_filter, kobj); 461 int err = kstrtoul(buf, 0, &filter->addr_range.end); 462 463 return err ? err : count; 464 } 465 466 static ssize_t damon_target_idx_show(struct kobject *kobj, 467 struct kobj_attribute *attr, char *buf) 468 { 469 struct damon_sysfs_scheme_filter *filter = container_of(kobj, 470 struct damon_sysfs_scheme_filter, kobj); 471 472 return sysfs_emit(buf, "%d\n", filter->target_idx); 473 } 474 475 static ssize_t damon_target_idx_store(struct kobject *kobj, 476 struct kobj_attribute *attr, const char *buf, size_t count) 477 { 478 struct damon_sysfs_scheme_filter *filter = container_of(kobj, 479 struct damon_sysfs_scheme_filter, kobj); 480 int err = kstrtoint(buf, 0, &filter->target_idx); 481 482 return err ? err : count; 483 } 484 485 static void damon_sysfs_scheme_filter_release(struct kobject *kobj) 486 { 487 struct damon_sysfs_scheme_filter *filter = container_of(kobj, 488 struct damon_sysfs_scheme_filter, kobj); 489 490 kfree(filter->memcg_path); 491 kfree(filter); 492 } 493 494 static struct kobj_attribute damon_sysfs_scheme_filter_type_attr = 495 __ATTR_RW_MODE(type, 0600); 496 497 static struct kobj_attribute damon_sysfs_scheme_filter_matching_attr = 498 __ATTR_RW_MODE(matching, 0600); 499 500 static struct kobj_attribute damon_sysfs_scheme_filter_memcg_path_attr = 501 __ATTR_RW_MODE(memcg_path, 0600); 502 503 static struct kobj_attribute damon_sysfs_scheme_filter_addr_start_attr = 504 __ATTR_RW_MODE(addr_start, 0600); 505 506 static struct kobj_attribute damon_sysfs_scheme_filter_addr_end_attr = 507 __ATTR_RW_MODE(addr_end, 0600); 508 509 static struct kobj_attribute damon_sysfs_scheme_filter_damon_target_idx_attr = 510 __ATTR_RW_MODE(damon_target_idx, 0600); 511 512 static struct attribute *damon_sysfs_scheme_filter_attrs[] = { 513 &damon_sysfs_scheme_filter_type_attr.attr, 514 &damon_sysfs_scheme_filter_matching_attr.attr, 515 &damon_sysfs_scheme_filter_memcg_path_attr.attr, 516 &damon_sysfs_scheme_filter_addr_start_attr.attr, 517 &damon_sysfs_scheme_filter_addr_end_attr.attr, 518 &damon_sysfs_scheme_filter_damon_target_idx_attr.attr, 519 NULL, 520 }; 521 ATTRIBUTE_GROUPS(damon_sysfs_scheme_filter); 522 523 static const struct kobj_type damon_sysfs_scheme_filter_ktype = { 524 .release = damon_sysfs_scheme_filter_release, 525 .sysfs_ops = &kobj_sysfs_ops, 526 .default_groups = damon_sysfs_scheme_filter_groups, 527 }; 528 529 /* 530 * filters directory 531 */ 532 533 struct damon_sysfs_scheme_filters { 534 struct kobject kobj; 535 struct damon_sysfs_scheme_filter **filters_arr; 536 int nr; 537 }; 538 539 static struct damon_sysfs_scheme_filters * 540 damon_sysfs_scheme_filters_alloc(void) 541 { 542 return kzalloc(sizeof(struct damon_sysfs_scheme_filters), GFP_KERNEL); 543 } 544 545 static void damon_sysfs_scheme_filters_rm_dirs( 546 struct damon_sysfs_scheme_filters *filters) 547 { 548 struct damon_sysfs_scheme_filter **filters_arr = filters->filters_arr; 549 int i; 550 551 for (i = 0; i < filters->nr; i++) 552 kobject_put(&filters_arr[i]->kobj); 553 filters->nr = 0; 554 kfree(filters_arr); 555 filters->filters_arr = NULL; 556 } 557 558 static int damon_sysfs_scheme_filters_add_dirs( 559 struct damon_sysfs_scheme_filters *filters, int nr_filters) 560 { 561 struct damon_sysfs_scheme_filter **filters_arr, *filter; 562 int err, i; 563 564 damon_sysfs_scheme_filters_rm_dirs(filters); 565 if (!nr_filters) 566 return 0; 567 568 filters_arr = kmalloc_array(nr_filters, sizeof(*filters_arr), 569 GFP_KERNEL | __GFP_NOWARN); 570 if (!filters_arr) 571 return -ENOMEM; 572 filters->filters_arr = filters_arr; 573 574 for (i = 0; i < nr_filters; i++) { 575 filter = damon_sysfs_scheme_filter_alloc(); 576 if (!filter) { 577 damon_sysfs_scheme_filters_rm_dirs(filters); 578 return -ENOMEM; 579 } 580 581 err = kobject_init_and_add(&filter->kobj, 582 &damon_sysfs_scheme_filter_ktype, 583 &filters->kobj, "%d", i); 584 if (err) { 585 kobject_put(&filter->kobj); 586 damon_sysfs_scheme_filters_rm_dirs(filters); 587 return err; 588 } 589 590 filters_arr[i] = filter; 591 filters->nr++; 592 } 593 return 0; 594 } 595 596 static ssize_t nr_filters_show(struct kobject *kobj, 597 struct kobj_attribute *attr, char *buf) 598 { 599 struct damon_sysfs_scheme_filters *filters = container_of(kobj, 600 struct damon_sysfs_scheme_filters, kobj); 601 602 return sysfs_emit(buf, "%d\n", filters->nr); 603 } 604 605 static ssize_t nr_filters_store(struct kobject *kobj, 606 struct kobj_attribute *attr, const char *buf, size_t count) 607 { 608 struct damon_sysfs_scheme_filters *filters; 609 int nr, err = kstrtoint(buf, 0, &nr); 610 611 if (err) 612 return err; 613 if (nr < 0) 614 return -EINVAL; 615 616 filters = container_of(kobj, struct damon_sysfs_scheme_filters, kobj); 617 618 if (!mutex_trylock(&damon_sysfs_lock)) 619 return -EBUSY; 620 err = damon_sysfs_scheme_filters_add_dirs(filters, nr); 621 mutex_unlock(&damon_sysfs_lock); 622 if (err) 623 return err; 624 625 return count; 626 } 627 628 static void damon_sysfs_scheme_filters_release(struct kobject *kobj) 629 { 630 kfree(container_of(kobj, struct damon_sysfs_scheme_filters, kobj)); 631 } 632 633 static struct kobj_attribute damon_sysfs_scheme_filters_nr_attr = 634 __ATTR_RW_MODE(nr_filters, 0600); 635 636 static struct attribute *damon_sysfs_scheme_filters_attrs[] = { 637 &damon_sysfs_scheme_filters_nr_attr.attr, 638 NULL, 639 }; 640 ATTRIBUTE_GROUPS(damon_sysfs_scheme_filters); 641 642 static const struct kobj_type damon_sysfs_scheme_filters_ktype = { 643 .release = damon_sysfs_scheme_filters_release, 644 .sysfs_ops = &kobj_sysfs_ops, 645 .default_groups = damon_sysfs_scheme_filters_groups, 646 }; 647 648 /* 649 * watermarks directory 650 */ 651 652 struct damon_sysfs_watermarks { 653 struct kobject kobj; 654 enum damos_wmark_metric metric; 655 unsigned long interval_us; 656 unsigned long high; 657 unsigned long mid; 658 unsigned long low; 659 }; 660 661 static struct damon_sysfs_watermarks *damon_sysfs_watermarks_alloc( 662 enum damos_wmark_metric metric, unsigned long interval_us, 663 unsigned long high, unsigned long mid, unsigned long low) 664 { 665 struct damon_sysfs_watermarks *watermarks = kmalloc( 666 sizeof(*watermarks), GFP_KERNEL); 667 668 if (!watermarks) 669 return NULL; 670 watermarks->kobj = (struct kobject){}; 671 watermarks->metric = metric; 672 watermarks->interval_us = interval_us; 673 watermarks->high = high; 674 watermarks->mid = mid; 675 watermarks->low = low; 676 return watermarks; 677 } 678 679 /* Should match with enum damos_wmark_metric */ 680 static const char * const damon_sysfs_wmark_metric_strs[] = { 681 "none", 682 "free_mem_rate", 683 }; 684 685 static ssize_t metric_show(struct kobject *kobj, struct kobj_attribute *attr, 686 char *buf) 687 { 688 struct damon_sysfs_watermarks *watermarks = container_of(kobj, 689 struct damon_sysfs_watermarks, kobj); 690 691 return sysfs_emit(buf, "%s\n", 692 damon_sysfs_wmark_metric_strs[watermarks->metric]); 693 } 694 695 static ssize_t metric_store(struct kobject *kobj, struct kobj_attribute *attr, 696 const char *buf, size_t count) 697 { 698 struct damon_sysfs_watermarks *watermarks = container_of(kobj, 699 struct damon_sysfs_watermarks, kobj); 700 enum damos_wmark_metric metric; 701 702 for (metric = 0; metric < NR_DAMOS_WMARK_METRICS; metric++) { 703 if (sysfs_streq(buf, damon_sysfs_wmark_metric_strs[metric])) { 704 watermarks->metric = metric; 705 return count; 706 } 707 } 708 return -EINVAL; 709 } 710 711 static ssize_t interval_us_show(struct kobject *kobj, 712 struct kobj_attribute *attr, char *buf) 713 { 714 struct damon_sysfs_watermarks *watermarks = container_of(kobj, 715 struct damon_sysfs_watermarks, kobj); 716 717 return sysfs_emit(buf, "%lu\n", watermarks->interval_us); 718 } 719 720 static ssize_t interval_us_store(struct kobject *kobj, 721 struct kobj_attribute *attr, const char *buf, size_t count) 722 { 723 struct damon_sysfs_watermarks *watermarks = container_of(kobj, 724 struct damon_sysfs_watermarks, kobj); 725 int err = kstrtoul(buf, 0, &watermarks->interval_us); 726 727 return err ? err : count; 728 } 729 730 static ssize_t high_show(struct kobject *kobj, 731 struct kobj_attribute *attr, char *buf) 732 { 733 struct damon_sysfs_watermarks *watermarks = container_of(kobj, 734 struct damon_sysfs_watermarks, kobj); 735 736 return sysfs_emit(buf, "%lu\n", watermarks->high); 737 } 738 739 static ssize_t high_store(struct kobject *kobj, 740 struct kobj_attribute *attr, const char *buf, size_t count) 741 { 742 struct damon_sysfs_watermarks *watermarks = container_of(kobj, 743 struct damon_sysfs_watermarks, kobj); 744 int err = kstrtoul(buf, 0, &watermarks->high); 745 746 return err ? err : count; 747 } 748 749 static ssize_t mid_show(struct kobject *kobj, 750 struct kobj_attribute *attr, char *buf) 751 { 752 struct damon_sysfs_watermarks *watermarks = container_of(kobj, 753 struct damon_sysfs_watermarks, kobj); 754 755 return sysfs_emit(buf, "%lu\n", watermarks->mid); 756 } 757 758 static ssize_t mid_store(struct kobject *kobj, 759 struct kobj_attribute *attr, const char *buf, size_t count) 760 { 761 struct damon_sysfs_watermarks *watermarks = container_of(kobj, 762 struct damon_sysfs_watermarks, kobj); 763 int err = kstrtoul(buf, 0, &watermarks->mid); 764 765 return err ? err : count; 766 } 767 768 static ssize_t low_show(struct kobject *kobj, 769 struct kobj_attribute *attr, char *buf) 770 { 771 struct damon_sysfs_watermarks *watermarks = container_of(kobj, 772 struct damon_sysfs_watermarks, kobj); 773 774 return sysfs_emit(buf, "%lu\n", watermarks->low); 775 } 776 777 static ssize_t low_store(struct kobject *kobj, 778 struct kobj_attribute *attr, const char *buf, size_t count) 779 { 780 struct damon_sysfs_watermarks *watermarks = container_of(kobj, 781 struct damon_sysfs_watermarks, kobj); 782 int err = kstrtoul(buf, 0, &watermarks->low); 783 784 return err ? err : count; 785 } 786 787 static void damon_sysfs_watermarks_release(struct kobject *kobj) 788 { 789 kfree(container_of(kobj, struct damon_sysfs_watermarks, kobj)); 790 } 791 792 static struct kobj_attribute damon_sysfs_watermarks_metric_attr = 793 __ATTR_RW_MODE(metric, 0600); 794 795 static struct kobj_attribute damon_sysfs_watermarks_interval_us_attr = 796 __ATTR_RW_MODE(interval_us, 0600); 797 798 static struct kobj_attribute damon_sysfs_watermarks_high_attr = 799 __ATTR_RW_MODE(high, 0600); 800 801 static struct kobj_attribute damon_sysfs_watermarks_mid_attr = 802 __ATTR_RW_MODE(mid, 0600); 803 804 static struct kobj_attribute damon_sysfs_watermarks_low_attr = 805 __ATTR_RW_MODE(low, 0600); 806 807 static struct attribute *damon_sysfs_watermarks_attrs[] = { 808 &damon_sysfs_watermarks_metric_attr.attr, 809 &damon_sysfs_watermarks_interval_us_attr.attr, 810 &damon_sysfs_watermarks_high_attr.attr, 811 &damon_sysfs_watermarks_mid_attr.attr, 812 &damon_sysfs_watermarks_low_attr.attr, 813 NULL, 814 }; 815 ATTRIBUTE_GROUPS(damon_sysfs_watermarks); 816 817 static const struct kobj_type damon_sysfs_watermarks_ktype = { 818 .release = damon_sysfs_watermarks_release, 819 .sysfs_ops = &kobj_sysfs_ops, 820 .default_groups = damon_sysfs_watermarks_groups, 821 }; 822 823 /* 824 * quota goal directory 825 */ 826 827 struct damos_sysfs_quota_goal { 828 struct kobject kobj; 829 unsigned long target_value; 830 unsigned long current_value; 831 }; 832 833 static struct damos_sysfs_quota_goal *damos_sysfs_quota_goal_alloc(void) 834 { 835 return kzalloc(sizeof(struct damos_sysfs_quota_goal), GFP_KERNEL); 836 } 837 838 static ssize_t target_value_show(struct kobject *kobj, 839 struct kobj_attribute *attr, char *buf) 840 { 841 struct damos_sysfs_quota_goal *goal = container_of(kobj, struct 842 damos_sysfs_quota_goal, kobj); 843 844 return sysfs_emit(buf, "%lu\n", goal->target_value); 845 } 846 847 static ssize_t target_value_store(struct kobject *kobj, 848 struct kobj_attribute *attr, const char *buf, size_t count) 849 { 850 struct damos_sysfs_quota_goal *goal = container_of(kobj, struct 851 damos_sysfs_quota_goal, kobj); 852 int err = kstrtoul(buf, 0, &goal->target_value); 853 854 return err ? err : count; 855 } 856 857 static ssize_t current_value_show(struct kobject *kobj, 858 struct kobj_attribute *attr, char *buf) 859 { 860 struct damos_sysfs_quota_goal *goal = container_of(kobj, struct 861 damos_sysfs_quota_goal, kobj); 862 863 return sysfs_emit(buf, "%lu\n", goal->current_value); 864 } 865 866 static ssize_t current_value_store(struct kobject *kobj, 867 struct kobj_attribute *attr, const char *buf, size_t count) 868 { 869 struct damos_sysfs_quota_goal *goal = container_of(kobj, struct 870 damos_sysfs_quota_goal, kobj); 871 int err = kstrtoul(buf, 0, &goal->current_value); 872 873 /* feed callback should check existence of this file and read value */ 874 return err ? err : count; 875 } 876 877 static void damos_sysfs_quota_goal_release(struct kobject *kobj) 878 { 879 /* or, notify this release to the feed callback */ 880 kfree(container_of(kobj, struct damos_sysfs_quota_goal, kobj)); 881 } 882 883 static struct kobj_attribute damos_sysfs_quota_goal_target_value_attr = 884 __ATTR_RW_MODE(target_value, 0600); 885 886 static struct kobj_attribute damos_sysfs_quota_goal_current_value_attr = 887 __ATTR_RW_MODE(current_value, 0600); 888 889 static struct attribute *damos_sysfs_quota_goal_attrs[] = { 890 &damos_sysfs_quota_goal_target_value_attr.attr, 891 &damos_sysfs_quota_goal_current_value_attr.attr, 892 NULL, 893 }; 894 ATTRIBUTE_GROUPS(damos_sysfs_quota_goal); 895 896 static const struct kobj_type damos_sysfs_quota_goal_ktype = { 897 .release = damos_sysfs_quota_goal_release, 898 .sysfs_ops = &kobj_sysfs_ops, 899 .default_groups = damos_sysfs_quota_goal_groups, 900 }; 901 902 /* 903 * quota goals directory 904 */ 905 906 struct damos_sysfs_quota_goals { 907 struct kobject kobj; 908 struct damos_sysfs_quota_goal **goals_arr; /* counted by nr */ 909 int nr; 910 }; 911 912 static struct damos_sysfs_quota_goals *damos_sysfs_quota_goals_alloc(void) 913 { 914 return kzalloc(sizeof(struct damos_sysfs_quota_goals), GFP_KERNEL); 915 } 916 917 static void damos_sysfs_quota_goals_rm_dirs( 918 struct damos_sysfs_quota_goals *goals) 919 { 920 struct damos_sysfs_quota_goal **goals_arr = goals->goals_arr; 921 int i; 922 923 for (i = 0; i < goals->nr; i++) 924 kobject_put(&goals_arr[i]->kobj); 925 goals->nr = 0; 926 kfree(goals_arr); 927 goals->goals_arr = NULL; 928 } 929 930 static int damos_sysfs_quota_goals_add_dirs( 931 struct damos_sysfs_quota_goals *goals, int nr_goals) 932 { 933 struct damos_sysfs_quota_goal **goals_arr, *goal; 934 int err, i; 935 936 damos_sysfs_quota_goals_rm_dirs(goals); 937 if (!nr_goals) 938 return 0; 939 940 goals_arr = kmalloc_array(nr_goals, sizeof(*goals_arr), 941 GFP_KERNEL | __GFP_NOWARN); 942 if (!goals_arr) 943 return -ENOMEM; 944 goals->goals_arr = goals_arr; 945 946 for (i = 0; i < nr_goals; i++) { 947 goal = damos_sysfs_quota_goal_alloc(); 948 if (!goal) { 949 damos_sysfs_quota_goals_rm_dirs(goals); 950 return -ENOMEM; 951 } 952 953 err = kobject_init_and_add(&goal->kobj, 954 &damos_sysfs_quota_goal_ktype, &goals->kobj, 955 "%d", i); 956 if (err) { 957 kobject_put(&goal->kobj); 958 damos_sysfs_quota_goals_rm_dirs(goals); 959 return err; 960 } 961 962 goals_arr[i] = goal; 963 goals->nr++; 964 } 965 return 0; 966 } 967 968 static ssize_t nr_goals_show(struct kobject *kobj, 969 struct kobj_attribute *attr, char *buf) 970 { 971 struct damos_sysfs_quota_goals *goals = container_of(kobj, 972 struct damos_sysfs_quota_goals, kobj); 973 974 return sysfs_emit(buf, "%d\n", goals->nr); 975 } 976 977 static ssize_t nr_goals_store(struct kobject *kobj, 978 struct kobj_attribute *attr, const char *buf, size_t count) 979 { 980 struct damos_sysfs_quota_goals *goals; 981 int nr, err = kstrtoint(buf, 0, &nr); 982 983 if (err) 984 return err; 985 if (nr < 0) 986 return -EINVAL; 987 988 goals = container_of(kobj, struct damos_sysfs_quota_goals, kobj); 989 990 if (!mutex_trylock(&damon_sysfs_lock)) 991 return -EBUSY; 992 err = damos_sysfs_quota_goals_add_dirs(goals, nr); 993 mutex_unlock(&damon_sysfs_lock); 994 if (err) 995 return err; 996 997 return count; 998 } 999 1000 static void damos_sysfs_quota_goals_release(struct kobject *kobj) 1001 { 1002 kfree(container_of(kobj, struct damos_sysfs_quota_goals, kobj)); 1003 } 1004 1005 static struct kobj_attribute damos_sysfs_quota_goals_nr_attr = 1006 __ATTR_RW_MODE(nr_goals, 0600); 1007 1008 static struct attribute *damos_sysfs_quota_goals_attrs[] = { 1009 &damos_sysfs_quota_goals_nr_attr.attr, 1010 NULL, 1011 }; 1012 ATTRIBUTE_GROUPS(damos_sysfs_quota_goals); 1013 1014 static const struct kobj_type damos_sysfs_quota_goals_ktype = { 1015 .release = damos_sysfs_quota_goals_release, 1016 .sysfs_ops = &kobj_sysfs_ops, 1017 .default_groups = damos_sysfs_quota_goals_groups, 1018 }; 1019 1020 /* 1021 * scheme/weights directory 1022 */ 1023 1024 struct damon_sysfs_weights { 1025 struct kobject kobj; 1026 unsigned int sz; 1027 unsigned int nr_accesses; 1028 unsigned int age; 1029 }; 1030 1031 static struct damon_sysfs_weights *damon_sysfs_weights_alloc(unsigned int sz, 1032 unsigned int nr_accesses, unsigned int age) 1033 { 1034 struct damon_sysfs_weights *weights = kmalloc(sizeof(*weights), 1035 GFP_KERNEL); 1036 1037 if (!weights) 1038 return NULL; 1039 weights->kobj = (struct kobject){}; 1040 weights->sz = sz; 1041 weights->nr_accesses = nr_accesses; 1042 weights->age = age; 1043 return weights; 1044 } 1045 1046 static ssize_t sz_permil_show(struct kobject *kobj, 1047 struct kobj_attribute *attr, char *buf) 1048 { 1049 struct damon_sysfs_weights *weights = container_of(kobj, 1050 struct damon_sysfs_weights, kobj); 1051 1052 return sysfs_emit(buf, "%u\n", weights->sz); 1053 } 1054 1055 static ssize_t sz_permil_store(struct kobject *kobj, 1056 struct kobj_attribute *attr, const char *buf, size_t count) 1057 { 1058 struct damon_sysfs_weights *weights = container_of(kobj, 1059 struct damon_sysfs_weights, kobj); 1060 int err = kstrtouint(buf, 0, &weights->sz); 1061 1062 return err ? err : count; 1063 } 1064 1065 static ssize_t nr_accesses_permil_show(struct kobject *kobj, 1066 struct kobj_attribute *attr, char *buf) 1067 { 1068 struct damon_sysfs_weights *weights = container_of(kobj, 1069 struct damon_sysfs_weights, kobj); 1070 1071 return sysfs_emit(buf, "%u\n", weights->nr_accesses); 1072 } 1073 1074 static ssize_t nr_accesses_permil_store(struct kobject *kobj, 1075 struct kobj_attribute *attr, const char *buf, size_t count) 1076 { 1077 struct damon_sysfs_weights *weights = container_of(kobj, 1078 struct damon_sysfs_weights, kobj); 1079 int err = kstrtouint(buf, 0, &weights->nr_accesses); 1080 1081 return err ? err : count; 1082 } 1083 1084 static ssize_t age_permil_show(struct kobject *kobj, 1085 struct kobj_attribute *attr, char *buf) 1086 { 1087 struct damon_sysfs_weights *weights = container_of(kobj, 1088 struct damon_sysfs_weights, kobj); 1089 1090 return sysfs_emit(buf, "%u\n", weights->age); 1091 } 1092 1093 static ssize_t age_permil_store(struct kobject *kobj, 1094 struct kobj_attribute *attr, const char *buf, size_t count) 1095 { 1096 struct damon_sysfs_weights *weights = container_of(kobj, 1097 struct damon_sysfs_weights, kobj); 1098 int err = kstrtouint(buf, 0, &weights->age); 1099 1100 return err ? err : count; 1101 } 1102 1103 static void damon_sysfs_weights_release(struct kobject *kobj) 1104 { 1105 kfree(container_of(kobj, struct damon_sysfs_weights, kobj)); 1106 } 1107 1108 static struct kobj_attribute damon_sysfs_weights_sz_attr = 1109 __ATTR_RW_MODE(sz_permil, 0600); 1110 1111 static struct kobj_attribute damon_sysfs_weights_nr_accesses_attr = 1112 __ATTR_RW_MODE(nr_accesses_permil, 0600); 1113 1114 static struct kobj_attribute damon_sysfs_weights_age_attr = 1115 __ATTR_RW_MODE(age_permil, 0600); 1116 1117 static struct attribute *damon_sysfs_weights_attrs[] = { 1118 &damon_sysfs_weights_sz_attr.attr, 1119 &damon_sysfs_weights_nr_accesses_attr.attr, 1120 &damon_sysfs_weights_age_attr.attr, 1121 NULL, 1122 }; 1123 ATTRIBUTE_GROUPS(damon_sysfs_weights); 1124 1125 static const struct kobj_type damon_sysfs_weights_ktype = { 1126 .release = damon_sysfs_weights_release, 1127 .sysfs_ops = &kobj_sysfs_ops, 1128 .default_groups = damon_sysfs_weights_groups, 1129 }; 1130 1131 /* 1132 * quotas directory 1133 */ 1134 1135 struct damon_sysfs_quotas { 1136 struct kobject kobj; 1137 struct damon_sysfs_weights *weights; 1138 struct damos_sysfs_quota_goals *goals; 1139 unsigned long ms; 1140 unsigned long sz; 1141 unsigned long reset_interval_ms; 1142 }; 1143 1144 static struct damon_sysfs_quotas *damon_sysfs_quotas_alloc(void) 1145 { 1146 return kzalloc(sizeof(struct damon_sysfs_quotas), GFP_KERNEL); 1147 } 1148 1149 static int damon_sysfs_quotas_add_dirs(struct damon_sysfs_quotas *quotas) 1150 { 1151 struct damon_sysfs_weights *weights; 1152 struct damos_sysfs_quota_goals *goals; 1153 int err; 1154 1155 weights = damon_sysfs_weights_alloc(0, 0, 0); 1156 if (!weights) 1157 return -ENOMEM; 1158 1159 err = kobject_init_and_add(&weights->kobj, &damon_sysfs_weights_ktype, 1160 "as->kobj, "weights"); 1161 if (err) { 1162 kobject_put(&weights->kobj); 1163 return err; 1164 } 1165 quotas->weights = weights; 1166 1167 goals = damos_sysfs_quota_goals_alloc(); 1168 if (!goals) { 1169 kobject_put(&weights->kobj); 1170 return -ENOMEM; 1171 } 1172 err = kobject_init_and_add(&goals->kobj, 1173 &damos_sysfs_quota_goals_ktype, "as->kobj, 1174 "goals"); 1175 if (err) { 1176 kobject_put(&weights->kobj); 1177 kobject_put(&goals->kobj); 1178 } else { 1179 quotas->goals = goals; 1180 } 1181 1182 return err; 1183 } 1184 1185 static void damon_sysfs_quotas_rm_dirs(struct damon_sysfs_quotas *quotas) 1186 { 1187 kobject_put("as->weights->kobj); 1188 damos_sysfs_quota_goals_rm_dirs(quotas->goals); 1189 kobject_put("as->goals->kobj); 1190 } 1191 1192 static ssize_t ms_show(struct kobject *kobj, struct kobj_attribute *attr, 1193 char *buf) 1194 { 1195 struct damon_sysfs_quotas *quotas = container_of(kobj, 1196 struct damon_sysfs_quotas, kobj); 1197 1198 return sysfs_emit(buf, "%lu\n", quotas->ms); 1199 } 1200 1201 static ssize_t ms_store(struct kobject *kobj, struct kobj_attribute *attr, 1202 const char *buf, size_t count) 1203 { 1204 struct damon_sysfs_quotas *quotas = container_of(kobj, 1205 struct damon_sysfs_quotas, kobj); 1206 int err = kstrtoul(buf, 0, "as->ms); 1207 1208 if (err) 1209 return -EINVAL; 1210 return count; 1211 } 1212 1213 static ssize_t bytes_show(struct kobject *kobj, struct kobj_attribute *attr, 1214 char *buf) 1215 { 1216 struct damon_sysfs_quotas *quotas = container_of(kobj, 1217 struct damon_sysfs_quotas, kobj); 1218 1219 return sysfs_emit(buf, "%lu\n", quotas->sz); 1220 } 1221 1222 static ssize_t bytes_store(struct kobject *kobj, 1223 struct kobj_attribute *attr, const char *buf, size_t count) 1224 { 1225 struct damon_sysfs_quotas *quotas = container_of(kobj, 1226 struct damon_sysfs_quotas, kobj); 1227 int err = kstrtoul(buf, 0, "as->sz); 1228 1229 if (err) 1230 return -EINVAL; 1231 return count; 1232 } 1233 1234 static ssize_t reset_interval_ms_show(struct kobject *kobj, 1235 struct kobj_attribute *attr, char *buf) 1236 { 1237 struct damon_sysfs_quotas *quotas = container_of(kobj, 1238 struct damon_sysfs_quotas, kobj); 1239 1240 return sysfs_emit(buf, "%lu\n", quotas->reset_interval_ms); 1241 } 1242 1243 static ssize_t reset_interval_ms_store(struct kobject *kobj, 1244 struct kobj_attribute *attr, const char *buf, size_t count) 1245 { 1246 struct damon_sysfs_quotas *quotas = container_of(kobj, 1247 struct damon_sysfs_quotas, kobj); 1248 int err = kstrtoul(buf, 0, "as->reset_interval_ms); 1249 1250 if (err) 1251 return -EINVAL; 1252 return count; 1253 } 1254 1255 static void damon_sysfs_quotas_release(struct kobject *kobj) 1256 { 1257 kfree(container_of(kobj, struct damon_sysfs_quotas, kobj)); 1258 } 1259 1260 static struct kobj_attribute damon_sysfs_quotas_ms_attr = 1261 __ATTR_RW_MODE(ms, 0600); 1262 1263 static struct kobj_attribute damon_sysfs_quotas_sz_attr = 1264 __ATTR_RW_MODE(bytes, 0600); 1265 1266 static struct kobj_attribute damon_sysfs_quotas_reset_interval_ms_attr = 1267 __ATTR_RW_MODE(reset_interval_ms, 0600); 1268 1269 static struct attribute *damon_sysfs_quotas_attrs[] = { 1270 &damon_sysfs_quotas_ms_attr.attr, 1271 &damon_sysfs_quotas_sz_attr.attr, 1272 &damon_sysfs_quotas_reset_interval_ms_attr.attr, 1273 NULL, 1274 }; 1275 ATTRIBUTE_GROUPS(damon_sysfs_quotas); 1276 1277 static const struct kobj_type damon_sysfs_quotas_ktype = { 1278 .release = damon_sysfs_quotas_release, 1279 .sysfs_ops = &kobj_sysfs_ops, 1280 .default_groups = damon_sysfs_quotas_groups, 1281 }; 1282 1283 /* 1284 * access_pattern directory 1285 */ 1286 1287 struct damon_sysfs_access_pattern { 1288 struct kobject kobj; 1289 struct damon_sysfs_ul_range *sz; 1290 struct damon_sysfs_ul_range *nr_accesses; 1291 struct damon_sysfs_ul_range *age; 1292 }; 1293 1294 static 1295 struct damon_sysfs_access_pattern *damon_sysfs_access_pattern_alloc(void) 1296 { 1297 struct damon_sysfs_access_pattern *access_pattern = 1298 kmalloc(sizeof(*access_pattern), GFP_KERNEL); 1299 1300 if (!access_pattern) 1301 return NULL; 1302 access_pattern->kobj = (struct kobject){}; 1303 return access_pattern; 1304 } 1305 1306 static int damon_sysfs_access_pattern_add_range_dir( 1307 struct damon_sysfs_access_pattern *access_pattern, 1308 struct damon_sysfs_ul_range **range_dir_ptr, 1309 char *name) 1310 { 1311 struct damon_sysfs_ul_range *range = damon_sysfs_ul_range_alloc(0, 0); 1312 int err; 1313 1314 if (!range) 1315 return -ENOMEM; 1316 err = kobject_init_and_add(&range->kobj, &damon_sysfs_ul_range_ktype, 1317 &access_pattern->kobj, name); 1318 if (err) 1319 kobject_put(&range->kobj); 1320 else 1321 *range_dir_ptr = range; 1322 return err; 1323 } 1324 1325 static int damon_sysfs_access_pattern_add_dirs( 1326 struct damon_sysfs_access_pattern *access_pattern) 1327 { 1328 int err; 1329 1330 err = damon_sysfs_access_pattern_add_range_dir(access_pattern, 1331 &access_pattern->sz, "sz"); 1332 if (err) 1333 goto put_sz_out; 1334 1335 err = damon_sysfs_access_pattern_add_range_dir(access_pattern, 1336 &access_pattern->nr_accesses, "nr_accesses"); 1337 if (err) 1338 goto put_nr_accesses_sz_out; 1339 1340 err = damon_sysfs_access_pattern_add_range_dir(access_pattern, 1341 &access_pattern->age, "age"); 1342 if (err) 1343 goto put_age_nr_accesses_sz_out; 1344 return 0; 1345 1346 put_age_nr_accesses_sz_out: 1347 kobject_put(&access_pattern->age->kobj); 1348 access_pattern->age = NULL; 1349 put_nr_accesses_sz_out: 1350 kobject_put(&access_pattern->nr_accesses->kobj); 1351 access_pattern->nr_accesses = NULL; 1352 put_sz_out: 1353 kobject_put(&access_pattern->sz->kobj); 1354 access_pattern->sz = NULL; 1355 return err; 1356 } 1357 1358 static void damon_sysfs_access_pattern_rm_dirs( 1359 struct damon_sysfs_access_pattern *access_pattern) 1360 { 1361 kobject_put(&access_pattern->sz->kobj); 1362 kobject_put(&access_pattern->nr_accesses->kobj); 1363 kobject_put(&access_pattern->age->kobj); 1364 } 1365 1366 static void damon_sysfs_access_pattern_release(struct kobject *kobj) 1367 { 1368 kfree(container_of(kobj, struct damon_sysfs_access_pattern, kobj)); 1369 } 1370 1371 static struct attribute *damon_sysfs_access_pattern_attrs[] = { 1372 NULL, 1373 }; 1374 ATTRIBUTE_GROUPS(damon_sysfs_access_pattern); 1375 1376 static const struct kobj_type damon_sysfs_access_pattern_ktype = { 1377 .release = damon_sysfs_access_pattern_release, 1378 .sysfs_ops = &kobj_sysfs_ops, 1379 .default_groups = damon_sysfs_access_pattern_groups, 1380 }; 1381 1382 /* 1383 * scheme directory 1384 */ 1385 1386 struct damon_sysfs_scheme { 1387 struct kobject kobj; 1388 enum damos_action action; 1389 struct damon_sysfs_access_pattern *access_pattern; 1390 unsigned long apply_interval_us; 1391 struct damon_sysfs_quotas *quotas; 1392 struct damon_sysfs_watermarks *watermarks; 1393 struct damon_sysfs_scheme_filters *filters; 1394 struct damon_sysfs_stats *stats; 1395 struct damon_sysfs_scheme_regions *tried_regions; 1396 }; 1397 1398 /* This should match with enum damos_action */ 1399 static const char * const damon_sysfs_damos_action_strs[] = { 1400 "willneed", 1401 "cold", 1402 "pageout", 1403 "hugepage", 1404 "nohugepage", 1405 "lru_prio", 1406 "lru_deprio", 1407 "stat", 1408 }; 1409 1410 static struct damon_sysfs_scheme *damon_sysfs_scheme_alloc( 1411 enum damos_action action, unsigned long apply_interval_us) 1412 { 1413 struct damon_sysfs_scheme *scheme = kmalloc(sizeof(*scheme), 1414 GFP_KERNEL); 1415 1416 if (!scheme) 1417 return NULL; 1418 scheme->kobj = (struct kobject){}; 1419 scheme->action = action; 1420 scheme->apply_interval_us = apply_interval_us; 1421 return scheme; 1422 } 1423 1424 static int damon_sysfs_scheme_set_access_pattern( 1425 struct damon_sysfs_scheme *scheme) 1426 { 1427 struct damon_sysfs_access_pattern *access_pattern; 1428 int err; 1429 1430 access_pattern = damon_sysfs_access_pattern_alloc(); 1431 if (!access_pattern) 1432 return -ENOMEM; 1433 err = kobject_init_and_add(&access_pattern->kobj, 1434 &damon_sysfs_access_pattern_ktype, &scheme->kobj, 1435 "access_pattern"); 1436 if (err) 1437 goto out; 1438 err = damon_sysfs_access_pattern_add_dirs(access_pattern); 1439 if (err) 1440 goto out; 1441 scheme->access_pattern = access_pattern; 1442 return 0; 1443 1444 out: 1445 kobject_put(&access_pattern->kobj); 1446 return err; 1447 } 1448 1449 static int damon_sysfs_scheme_set_quotas(struct damon_sysfs_scheme *scheme) 1450 { 1451 struct damon_sysfs_quotas *quotas = damon_sysfs_quotas_alloc(); 1452 int err; 1453 1454 if (!quotas) 1455 return -ENOMEM; 1456 err = kobject_init_and_add("as->kobj, &damon_sysfs_quotas_ktype, 1457 &scheme->kobj, "quotas"); 1458 if (err) 1459 goto out; 1460 err = damon_sysfs_quotas_add_dirs(quotas); 1461 if (err) 1462 goto out; 1463 scheme->quotas = quotas; 1464 return 0; 1465 1466 out: 1467 kobject_put("as->kobj); 1468 return err; 1469 } 1470 1471 static int damon_sysfs_scheme_set_watermarks(struct damon_sysfs_scheme *scheme) 1472 { 1473 struct damon_sysfs_watermarks *watermarks = 1474 damon_sysfs_watermarks_alloc(DAMOS_WMARK_NONE, 0, 0, 0, 0); 1475 int err; 1476 1477 if (!watermarks) 1478 return -ENOMEM; 1479 err = kobject_init_and_add(&watermarks->kobj, 1480 &damon_sysfs_watermarks_ktype, &scheme->kobj, 1481 "watermarks"); 1482 if (err) 1483 kobject_put(&watermarks->kobj); 1484 else 1485 scheme->watermarks = watermarks; 1486 return err; 1487 } 1488 1489 static int damon_sysfs_scheme_set_filters(struct damon_sysfs_scheme *scheme) 1490 { 1491 struct damon_sysfs_scheme_filters *filters = 1492 damon_sysfs_scheme_filters_alloc(); 1493 int err; 1494 1495 if (!filters) 1496 return -ENOMEM; 1497 err = kobject_init_and_add(&filters->kobj, 1498 &damon_sysfs_scheme_filters_ktype, &scheme->kobj, 1499 "filters"); 1500 if (err) 1501 kobject_put(&filters->kobj); 1502 else 1503 scheme->filters = filters; 1504 return err; 1505 } 1506 1507 static int damon_sysfs_scheme_set_stats(struct damon_sysfs_scheme *scheme) 1508 { 1509 struct damon_sysfs_stats *stats = damon_sysfs_stats_alloc(); 1510 int err; 1511 1512 if (!stats) 1513 return -ENOMEM; 1514 err = kobject_init_and_add(&stats->kobj, &damon_sysfs_stats_ktype, 1515 &scheme->kobj, "stats"); 1516 if (err) 1517 kobject_put(&stats->kobj); 1518 else 1519 scheme->stats = stats; 1520 return err; 1521 } 1522 1523 static int damon_sysfs_scheme_set_tried_regions( 1524 struct damon_sysfs_scheme *scheme) 1525 { 1526 struct damon_sysfs_scheme_regions *tried_regions = 1527 damon_sysfs_scheme_regions_alloc(); 1528 int err; 1529 1530 if (!tried_regions) 1531 return -ENOMEM; 1532 err = kobject_init_and_add(&tried_regions->kobj, 1533 &damon_sysfs_scheme_regions_ktype, &scheme->kobj, 1534 "tried_regions"); 1535 if (err) 1536 kobject_put(&tried_regions->kobj); 1537 else 1538 scheme->tried_regions = tried_regions; 1539 return err; 1540 } 1541 1542 static int damon_sysfs_scheme_add_dirs(struct damon_sysfs_scheme *scheme) 1543 { 1544 int err; 1545 1546 err = damon_sysfs_scheme_set_access_pattern(scheme); 1547 if (err) 1548 return err; 1549 err = damon_sysfs_scheme_set_quotas(scheme); 1550 if (err) 1551 goto put_access_pattern_out; 1552 err = damon_sysfs_scheme_set_watermarks(scheme); 1553 if (err) 1554 goto put_quotas_access_pattern_out; 1555 err = damon_sysfs_scheme_set_filters(scheme); 1556 if (err) 1557 goto put_watermarks_quotas_access_pattern_out; 1558 err = damon_sysfs_scheme_set_stats(scheme); 1559 if (err) 1560 goto put_filters_watermarks_quotas_access_pattern_out; 1561 err = damon_sysfs_scheme_set_tried_regions(scheme); 1562 if (err) 1563 goto put_tried_regions_out; 1564 return 0; 1565 1566 put_tried_regions_out: 1567 kobject_put(&scheme->tried_regions->kobj); 1568 scheme->tried_regions = NULL; 1569 put_filters_watermarks_quotas_access_pattern_out: 1570 kobject_put(&scheme->filters->kobj); 1571 scheme->filters = NULL; 1572 put_watermarks_quotas_access_pattern_out: 1573 kobject_put(&scheme->watermarks->kobj); 1574 scheme->watermarks = NULL; 1575 put_quotas_access_pattern_out: 1576 kobject_put(&scheme->quotas->kobj); 1577 scheme->quotas = NULL; 1578 put_access_pattern_out: 1579 kobject_put(&scheme->access_pattern->kobj); 1580 scheme->access_pattern = NULL; 1581 return err; 1582 } 1583 1584 static void damon_sysfs_scheme_rm_dirs(struct damon_sysfs_scheme *scheme) 1585 { 1586 damon_sysfs_access_pattern_rm_dirs(scheme->access_pattern); 1587 kobject_put(&scheme->access_pattern->kobj); 1588 damon_sysfs_quotas_rm_dirs(scheme->quotas); 1589 kobject_put(&scheme->quotas->kobj); 1590 kobject_put(&scheme->watermarks->kobj); 1591 damon_sysfs_scheme_filters_rm_dirs(scheme->filters); 1592 kobject_put(&scheme->filters->kobj); 1593 kobject_put(&scheme->stats->kobj); 1594 damon_sysfs_scheme_regions_rm_dirs(scheme->tried_regions); 1595 kobject_put(&scheme->tried_regions->kobj); 1596 } 1597 1598 static ssize_t action_show(struct kobject *kobj, struct kobj_attribute *attr, 1599 char *buf) 1600 { 1601 struct damon_sysfs_scheme *scheme = container_of(kobj, 1602 struct damon_sysfs_scheme, kobj); 1603 1604 return sysfs_emit(buf, "%s\n", 1605 damon_sysfs_damos_action_strs[scheme->action]); 1606 } 1607 1608 static ssize_t action_store(struct kobject *kobj, struct kobj_attribute *attr, 1609 const char *buf, size_t count) 1610 { 1611 struct damon_sysfs_scheme *scheme = container_of(kobj, 1612 struct damon_sysfs_scheme, kobj); 1613 enum damos_action action; 1614 1615 for (action = 0; action < NR_DAMOS_ACTIONS; action++) { 1616 if (sysfs_streq(buf, damon_sysfs_damos_action_strs[action])) { 1617 scheme->action = action; 1618 return count; 1619 } 1620 } 1621 return -EINVAL; 1622 } 1623 1624 static ssize_t apply_interval_us_show(struct kobject *kobj, 1625 struct kobj_attribute *attr, char *buf) 1626 { 1627 struct damon_sysfs_scheme *scheme = container_of(kobj, 1628 struct damon_sysfs_scheme, kobj); 1629 1630 return sysfs_emit(buf, "%lu\n", scheme->apply_interval_us); 1631 } 1632 1633 static ssize_t apply_interval_us_store(struct kobject *kobj, 1634 struct kobj_attribute *attr, const char *buf, size_t count) 1635 { 1636 struct damon_sysfs_scheme *scheme = container_of(kobj, 1637 struct damon_sysfs_scheme, kobj); 1638 int err = kstrtoul(buf, 0, &scheme->apply_interval_us); 1639 1640 return err ? err : count; 1641 } 1642 1643 static void damon_sysfs_scheme_release(struct kobject *kobj) 1644 { 1645 kfree(container_of(kobj, struct damon_sysfs_scheme, kobj)); 1646 } 1647 1648 static struct kobj_attribute damon_sysfs_scheme_action_attr = 1649 __ATTR_RW_MODE(action, 0600); 1650 1651 static struct kobj_attribute damon_sysfs_scheme_apply_interval_us_attr = 1652 __ATTR_RW_MODE(apply_interval_us, 0600); 1653 1654 static struct attribute *damon_sysfs_scheme_attrs[] = { 1655 &damon_sysfs_scheme_action_attr.attr, 1656 &damon_sysfs_scheme_apply_interval_us_attr.attr, 1657 NULL, 1658 }; 1659 ATTRIBUTE_GROUPS(damon_sysfs_scheme); 1660 1661 static const struct kobj_type damon_sysfs_scheme_ktype = { 1662 .release = damon_sysfs_scheme_release, 1663 .sysfs_ops = &kobj_sysfs_ops, 1664 .default_groups = damon_sysfs_scheme_groups, 1665 }; 1666 1667 /* 1668 * schemes directory 1669 */ 1670 1671 struct damon_sysfs_schemes *damon_sysfs_schemes_alloc(void) 1672 { 1673 return kzalloc(sizeof(struct damon_sysfs_schemes), GFP_KERNEL); 1674 } 1675 1676 void damon_sysfs_schemes_rm_dirs(struct damon_sysfs_schemes *schemes) 1677 { 1678 struct damon_sysfs_scheme **schemes_arr = schemes->schemes_arr; 1679 int i; 1680 1681 for (i = 0; i < schemes->nr; i++) { 1682 damon_sysfs_scheme_rm_dirs(schemes_arr[i]); 1683 kobject_put(&schemes_arr[i]->kobj); 1684 } 1685 schemes->nr = 0; 1686 kfree(schemes_arr); 1687 schemes->schemes_arr = NULL; 1688 } 1689 1690 static int damon_sysfs_schemes_add_dirs(struct damon_sysfs_schemes *schemes, 1691 int nr_schemes) 1692 { 1693 struct damon_sysfs_scheme **schemes_arr, *scheme; 1694 int err, i; 1695 1696 damon_sysfs_schemes_rm_dirs(schemes); 1697 if (!nr_schemes) 1698 return 0; 1699 1700 schemes_arr = kmalloc_array(nr_schemes, sizeof(*schemes_arr), 1701 GFP_KERNEL | __GFP_NOWARN); 1702 if (!schemes_arr) 1703 return -ENOMEM; 1704 schemes->schemes_arr = schemes_arr; 1705 1706 for (i = 0; i < nr_schemes; i++) { 1707 /* 1708 * apply_interval_us as 0 means same to aggregation interval 1709 * (same to before-apply_interval behavior) 1710 */ 1711 scheme = damon_sysfs_scheme_alloc(DAMOS_STAT, 0); 1712 if (!scheme) { 1713 damon_sysfs_schemes_rm_dirs(schemes); 1714 return -ENOMEM; 1715 } 1716 1717 err = kobject_init_and_add(&scheme->kobj, 1718 &damon_sysfs_scheme_ktype, &schemes->kobj, 1719 "%d", i); 1720 if (err) 1721 goto out; 1722 err = damon_sysfs_scheme_add_dirs(scheme); 1723 if (err) 1724 goto out; 1725 1726 schemes_arr[i] = scheme; 1727 schemes->nr++; 1728 } 1729 return 0; 1730 1731 out: 1732 damon_sysfs_schemes_rm_dirs(schemes); 1733 kobject_put(&scheme->kobj); 1734 return err; 1735 } 1736 1737 static ssize_t nr_schemes_show(struct kobject *kobj, 1738 struct kobj_attribute *attr, char *buf) 1739 { 1740 struct damon_sysfs_schemes *schemes = container_of(kobj, 1741 struct damon_sysfs_schemes, kobj); 1742 1743 return sysfs_emit(buf, "%d\n", schemes->nr); 1744 } 1745 1746 static ssize_t nr_schemes_store(struct kobject *kobj, 1747 struct kobj_attribute *attr, const char *buf, size_t count) 1748 { 1749 struct damon_sysfs_schemes *schemes; 1750 int nr, err = kstrtoint(buf, 0, &nr); 1751 1752 if (err) 1753 return err; 1754 if (nr < 0) 1755 return -EINVAL; 1756 1757 schemes = container_of(kobj, struct damon_sysfs_schemes, kobj); 1758 1759 if (!mutex_trylock(&damon_sysfs_lock)) 1760 return -EBUSY; 1761 err = damon_sysfs_schemes_add_dirs(schemes, nr); 1762 mutex_unlock(&damon_sysfs_lock); 1763 if (err) 1764 return err; 1765 return count; 1766 } 1767 1768 static void damon_sysfs_schemes_release(struct kobject *kobj) 1769 { 1770 kfree(container_of(kobj, struct damon_sysfs_schemes, kobj)); 1771 } 1772 1773 static struct kobj_attribute damon_sysfs_schemes_nr_attr = 1774 __ATTR_RW_MODE(nr_schemes, 0600); 1775 1776 static struct attribute *damon_sysfs_schemes_attrs[] = { 1777 &damon_sysfs_schemes_nr_attr.attr, 1778 NULL, 1779 }; 1780 ATTRIBUTE_GROUPS(damon_sysfs_schemes); 1781 1782 const struct kobj_type damon_sysfs_schemes_ktype = { 1783 .release = damon_sysfs_schemes_release, 1784 .sysfs_ops = &kobj_sysfs_ops, 1785 .default_groups = damon_sysfs_schemes_groups, 1786 }; 1787 1788 static bool damon_sysfs_memcg_path_eq(struct mem_cgroup *memcg, 1789 char *memcg_path_buf, char *path) 1790 { 1791 #ifdef CONFIG_MEMCG 1792 cgroup_path(memcg->css.cgroup, memcg_path_buf, PATH_MAX); 1793 if (sysfs_streq(memcg_path_buf, path)) 1794 return true; 1795 #endif /* CONFIG_MEMCG */ 1796 return false; 1797 } 1798 1799 static int damon_sysfs_memcg_path_to_id(char *memcg_path, unsigned short *id) 1800 { 1801 struct mem_cgroup *memcg; 1802 char *path; 1803 bool found = false; 1804 1805 if (!memcg_path) 1806 return -EINVAL; 1807 1808 path = kmalloc(sizeof(*path) * PATH_MAX, GFP_KERNEL); 1809 if (!path) 1810 return -ENOMEM; 1811 1812 for (memcg = mem_cgroup_iter(NULL, NULL, NULL); memcg; 1813 memcg = mem_cgroup_iter(NULL, memcg, NULL)) { 1814 /* skip removed memcg */ 1815 if (!mem_cgroup_id(memcg)) 1816 continue; 1817 if (damon_sysfs_memcg_path_eq(memcg, path, memcg_path)) { 1818 *id = mem_cgroup_id(memcg); 1819 found = true; 1820 break; 1821 } 1822 } 1823 1824 kfree(path); 1825 return found ? 0 : -EINVAL; 1826 } 1827 1828 static int damon_sysfs_set_scheme_filters(struct damos *scheme, 1829 struct damon_sysfs_scheme_filters *sysfs_filters) 1830 { 1831 int i; 1832 struct damos_filter *filter, *next; 1833 1834 damos_for_each_filter_safe(filter, next, scheme) 1835 damos_destroy_filter(filter); 1836 1837 for (i = 0; i < sysfs_filters->nr; i++) { 1838 struct damon_sysfs_scheme_filter *sysfs_filter = 1839 sysfs_filters->filters_arr[i]; 1840 struct damos_filter *filter = 1841 damos_new_filter(sysfs_filter->type, 1842 sysfs_filter->matching); 1843 int err; 1844 1845 if (!filter) 1846 return -ENOMEM; 1847 if (filter->type == DAMOS_FILTER_TYPE_MEMCG) { 1848 err = damon_sysfs_memcg_path_to_id( 1849 sysfs_filter->memcg_path, 1850 &filter->memcg_id); 1851 if (err) { 1852 damos_destroy_filter(filter); 1853 return err; 1854 } 1855 } else if (filter->type == DAMOS_FILTER_TYPE_ADDR) { 1856 if (sysfs_filter->addr_range.end < 1857 sysfs_filter->addr_range.start) { 1858 damos_destroy_filter(filter); 1859 return -EINVAL; 1860 } 1861 filter->addr_range = sysfs_filter->addr_range; 1862 } else if (filter->type == DAMOS_FILTER_TYPE_TARGET) { 1863 filter->target_idx = sysfs_filter->target_idx; 1864 } 1865 1866 damos_add_filter(scheme, filter); 1867 } 1868 return 0; 1869 } 1870 1871 static unsigned long damos_sysfs_get_quota_score(void *arg) 1872 { 1873 return (unsigned long)arg; 1874 } 1875 1876 static void damos_sysfs_set_quota_score( 1877 struct damos_sysfs_quota_goals *sysfs_goals, 1878 struct damos_quota *quota) 1879 { 1880 struct damos_sysfs_quota_goal *sysfs_goal; 1881 int i; 1882 1883 quota->get_score = NULL; 1884 quota->get_score_arg = (void *)0; 1885 for (i = 0; i < sysfs_goals->nr; i++) { 1886 sysfs_goal = sysfs_goals->goals_arr[i]; 1887 if (!sysfs_goal->target_value) 1888 continue; 1889 1890 /* Higher score makes scheme less aggressive */ 1891 quota->get_score_arg = (void *)max( 1892 (unsigned long)quota->get_score_arg, 1893 sysfs_goal->current_value * 10000 / 1894 sysfs_goal->target_value); 1895 quota->get_score = damos_sysfs_get_quota_score; 1896 } 1897 } 1898 1899 void damos_sysfs_set_quota_scores(struct damon_sysfs_schemes *sysfs_schemes, 1900 struct damon_ctx *ctx) 1901 { 1902 struct damos *scheme; 1903 int i = 0; 1904 1905 damon_for_each_scheme(scheme, ctx) { 1906 struct damon_sysfs_scheme *sysfs_scheme; 1907 1908 sysfs_scheme = sysfs_schemes->schemes_arr[i]; 1909 damos_sysfs_set_quota_score(sysfs_scheme->quotas->goals, 1910 &scheme->quota); 1911 i++; 1912 } 1913 } 1914 1915 static struct damos *damon_sysfs_mk_scheme( 1916 struct damon_sysfs_scheme *sysfs_scheme) 1917 { 1918 struct damon_sysfs_access_pattern *access_pattern = 1919 sysfs_scheme->access_pattern; 1920 struct damon_sysfs_quotas *sysfs_quotas = sysfs_scheme->quotas; 1921 struct damon_sysfs_weights *sysfs_weights = sysfs_quotas->weights; 1922 struct damon_sysfs_watermarks *sysfs_wmarks = sysfs_scheme->watermarks; 1923 struct damon_sysfs_scheme_filters *sysfs_filters = 1924 sysfs_scheme->filters; 1925 struct damos *scheme; 1926 int err; 1927 1928 struct damos_access_pattern pattern = { 1929 .min_sz_region = access_pattern->sz->min, 1930 .max_sz_region = access_pattern->sz->max, 1931 .min_nr_accesses = access_pattern->nr_accesses->min, 1932 .max_nr_accesses = access_pattern->nr_accesses->max, 1933 .min_age_region = access_pattern->age->min, 1934 .max_age_region = access_pattern->age->max, 1935 }; 1936 struct damos_quota quota = { 1937 .ms = sysfs_quotas->ms, 1938 .sz = sysfs_quotas->sz, 1939 .reset_interval = sysfs_quotas->reset_interval_ms, 1940 .weight_sz = sysfs_weights->sz, 1941 .weight_nr_accesses = sysfs_weights->nr_accesses, 1942 .weight_age = sysfs_weights->age, 1943 }; 1944 struct damos_watermarks wmarks = { 1945 .metric = sysfs_wmarks->metric, 1946 .interval = sysfs_wmarks->interval_us, 1947 .high = sysfs_wmarks->high, 1948 .mid = sysfs_wmarks->mid, 1949 .low = sysfs_wmarks->low, 1950 }; 1951 1952 damos_sysfs_set_quota_score(sysfs_quotas->goals, "a); 1953 1954 scheme = damon_new_scheme(&pattern, sysfs_scheme->action, 1955 sysfs_scheme->apply_interval_us, "a, &wmarks); 1956 if (!scheme) 1957 return NULL; 1958 1959 err = damon_sysfs_set_scheme_filters(scheme, sysfs_filters); 1960 if (err) { 1961 damon_destroy_scheme(scheme); 1962 return NULL; 1963 } 1964 return scheme; 1965 } 1966 1967 static void damon_sysfs_update_scheme(struct damos *scheme, 1968 struct damon_sysfs_scheme *sysfs_scheme) 1969 { 1970 struct damon_sysfs_access_pattern *access_pattern = 1971 sysfs_scheme->access_pattern; 1972 struct damon_sysfs_quotas *sysfs_quotas = sysfs_scheme->quotas; 1973 struct damon_sysfs_weights *sysfs_weights = sysfs_quotas->weights; 1974 struct damon_sysfs_watermarks *sysfs_wmarks = sysfs_scheme->watermarks; 1975 int err; 1976 1977 scheme->pattern.min_sz_region = access_pattern->sz->min; 1978 scheme->pattern.max_sz_region = access_pattern->sz->max; 1979 scheme->pattern.min_nr_accesses = access_pattern->nr_accesses->min; 1980 scheme->pattern.max_nr_accesses = access_pattern->nr_accesses->max; 1981 scheme->pattern.min_age_region = access_pattern->age->min; 1982 scheme->pattern.max_age_region = access_pattern->age->max; 1983 1984 scheme->action = sysfs_scheme->action; 1985 scheme->apply_interval_us = sysfs_scheme->apply_interval_us; 1986 1987 scheme->quota.ms = sysfs_quotas->ms; 1988 scheme->quota.sz = sysfs_quotas->sz; 1989 scheme->quota.reset_interval = sysfs_quotas->reset_interval_ms; 1990 scheme->quota.weight_sz = sysfs_weights->sz; 1991 scheme->quota.weight_nr_accesses = sysfs_weights->nr_accesses; 1992 scheme->quota.weight_age = sysfs_weights->age; 1993 1994 damos_sysfs_set_quota_score(sysfs_quotas->goals, &scheme->quota); 1995 1996 scheme->wmarks.metric = sysfs_wmarks->metric; 1997 scheme->wmarks.interval = sysfs_wmarks->interval_us; 1998 scheme->wmarks.high = sysfs_wmarks->high; 1999 scheme->wmarks.mid = sysfs_wmarks->mid; 2000 scheme->wmarks.low = sysfs_wmarks->low; 2001 2002 err = damon_sysfs_set_scheme_filters(scheme, sysfs_scheme->filters); 2003 if (err) 2004 damon_destroy_scheme(scheme); 2005 } 2006 2007 int damon_sysfs_set_schemes(struct damon_ctx *ctx, 2008 struct damon_sysfs_schemes *sysfs_schemes) 2009 { 2010 struct damos *scheme, *next; 2011 int i = 0; 2012 2013 damon_for_each_scheme_safe(scheme, next, ctx) { 2014 if (i < sysfs_schemes->nr) 2015 damon_sysfs_update_scheme(scheme, 2016 sysfs_schemes->schemes_arr[i]); 2017 else 2018 damon_destroy_scheme(scheme); 2019 i++; 2020 } 2021 2022 for (; i < sysfs_schemes->nr; i++) { 2023 struct damos *scheme, *next; 2024 2025 scheme = damon_sysfs_mk_scheme(sysfs_schemes->schemes_arr[i]); 2026 if (!scheme) { 2027 damon_for_each_scheme_safe(scheme, next, ctx) 2028 damon_destroy_scheme(scheme); 2029 return -ENOMEM; 2030 } 2031 damon_add_scheme(ctx, scheme); 2032 } 2033 return 0; 2034 } 2035 2036 void damon_sysfs_schemes_update_stats( 2037 struct damon_sysfs_schemes *sysfs_schemes, 2038 struct damon_ctx *ctx) 2039 { 2040 struct damos *scheme; 2041 int schemes_idx = 0; 2042 2043 damon_for_each_scheme(scheme, ctx) { 2044 struct damon_sysfs_stats *sysfs_stats; 2045 2046 /* user could have removed the scheme sysfs dir */ 2047 if (schemes_idx >= sysfs_schemes->nr) 2048 break; 2049 2050 sysfs_stats = sysfs_schemes->schemes_arr[schemes_idx++]->stats; 2051 sysfs_stats->nr_tried = scheme->stat.nr_tried; 2052 sysfs_stats->sz_tried = scheme->stat.sz_tried; 2053 sysfs_stats->nr_applied = scheme->stat.nr_applied; 2054 sysfs_stats->sz_applied = scheme->stat.sz_applied; 2055 sysfs_stats->qt_exceeds = scheme->stat.qt_exceeds; 2056 } 2057 } 2058 2059 /* 2060 * damon_sysfs_schemes that need to update its schemes regions dir. Protected 2061 * by damon_sysfs_lock 2062 */ 2063 static struct damon_sysfs_schemes *damon_sysfs_schemes_for_damos_callback; 2064 static int damon_sysfs_schemes_region_idx; 2065 static bool damos_regions_upd_total_bytes_only; 2066 2067 /* 2068 * DAMON callback that called before damos apply. While this callback is 2069 * registered, damon_sysfs_lock should be held to ensure the regions 2070 * directories exist. 2071 */ 2072 static int damon_sysfs_before_damos_apply(struct damon_ctx *ctx, 2073 struct damon_target *t, struct damon_region *r, 2074 struct damos *s) 2075 { 2076 struct damos *scheme; 2077 struct damon_sysfs_scheme_regions *sysfs_regions; 2078 struct damon_sysfs_scheme_region *region; 2079 struct damon_sysfs_schemes *sysfs_schemes = 2080 damon_sysfs_schemes_for_damos_callback; 2081 int schemes_idx = 0; 2082 2083 damon_for_each_scheme(scheme, ctx) { 2084 if (scheme == s) 2085 break; 2086 schemes_idx++; 2087 } 2088 2089 /* user could have removed the scheme sysfs dir */ 2090 if (schemes_idx >= sysfs_schemes->nr) 2091 return 0; 2092 2093 sysfs_regions = sysfs_schemes->schemes_arr[schemes_idx]->tried_regions; 2094 if (sysfs_regions->upd_status == DAMOS_TRIED_REGIONS_UPD_FINISHED) 2095 return 0; 2096 if (sysfs_regions->upd_status == DAMOS_TRIED_REGIONS_UPD_IDLE) 2097 sysfs_regions->upd_status = DAMOS_TRIED_REGIONS_UPD_STARTED; 2098 sysfs_regions->total_bytes += r->ar.end - r->ar.start; 2099 if (damos_regions_upd_total_bytes_only) 2100 return 0; 2101 2102 region = damon_sysfs_scheme_region_alloc(r); 2103 if (!region) 2104 return 0; 2105 list_add_tail(®ion->list, &sysfs_regions->regions_list); 2106 sysfs_regions->nr_regions++; 2107 if (kobject_init_and_add(®ion->kobj, 2108 &damon_sysfs_scheme_region_ktype, 2109 &sysfs_regions->kobj, "%d", 2110 damon_sysfs_schemes_region_idx++)) { 2111 kobject_put(®ion->kobj); 2112 } 2113 return 0; 2114 } 2115 2116 /* 2117 * DAMON callback that called after each accesses sampling. While this 2118 * callback is registered, damon_sysfs_lock should be held to ensure the 2119 * regions directories exist. 2120 */ 2121 static int damon_sysfs_after_sampling(struct damon_ctx *ctx) 2122 { 2123 struct damon_sysfs_schemes *sysfs_schemes = 2124 damon_sysfs_schemes_for_damos_callback; 2125 struct damon_sysfs_scheme_regions *sysfs_regions; 2126 int i; 2127 2128 for (i = 0; i < sysfs_schemes->nr; i++) { 2129 sysfs_regions = sysfs_schemes->schemes_arr[i]->tried_regions; 2130 if (sysfs_regions->upd_status == 2131 DAMOS_TRIED_REGIONS_UPD_STARTED || 2132 time_after(jiffies, 2133 sysfs_regions->upd_timeout_jiffies)) 2134 sysfs_regions->upd_status = 2135 DAMOS_TRIED_REGIONS_UPD_FINISHED; 2136 } 2137 2138 return 0; 2139 } 2140 2141 /* Called from damon_sysfs_cmd_request_callback under damon_sysfs_lock */ 2142 int damon_sysfs_schemes_clear_regions( 2143 struct damon_sysfs_schemes *sysfs_schemes, 2144 struct damon_ctx *ctx) 2145 { 2146 struct damos *scheme; 2147 int schemes_idx = 0; 2148 2149 damon_for_each_scheme(scheme, ctx) { 2150 struct damon_sysfs_scheme *sysfs_scheme; 2151 2152 /* user could have removed the scheme sysfs dir */ 2153 if (schemes_idx >= sysfs_schemes->nr) 2154 break; 2155 2156 sysfs_scheme = sysfs_schemes->schemes_arr[schemes_idx++]; 2157 damon_sysfs_scheme_regions_rm_dirs( 2158 sysfs_scheme->tried_regions); 2159 sysfs_scheme->tried_regions->total_bytes = 0; 2160 } 2161 return 0; 2162 } 2163 2164 static struct damos *damos_sysfs_nth_scheme(int n, struct damon_ctx *ctx) 2165 { 2166 struct damos *scheme; 2167 int i = 0; 2168 2169 damon_for_each_scheme(scheme, ctx) { 2170 if (i == n) 2171 return scheme; 2172 i++; 2173 } 2174 return NULL; 2175 } 2176 2177 static void damos_tried_regions_init_upd_status( 2178 struct damon_sysfs_schemes *sysfs_schemes, 2179 struct damon_ctx *ctx) 2180 { 2181 int i; 2182 struct damos *scheme; 2183 struct damon_sysfs_scheme_regions *sysfs_regions; 2184 2185 for (i = 0; i < sysfs_schemes->nr; i++) { 2186 sysfs_regions = sysfs_schemes->schemes_arr[i]->tried_regions; 2187 scheme = damos_sysfs_nth_scheme(i, ctx); 2188 if (!scheme) { 2189 sysfs_regions->upd_status = 2190 DAMOS_TRIED_REGIONS_UPD_FINISHED; 2191 continue; 2192 } 2193 sysfs_regions->upd_status = DAMOS_TRIED_REGIONS_UPD_IDLE; 2194 sysfs_regions->upd_timeout_jiffies = jiffies + 2195 2 * usecs_to_jiffies(scheme->apply_interval_us ? 2196 scheme->apply_interval_us : 2197 ctx->attrs.sample_interval); 2198 } 2199 } 2200 2201 /* Called from damon_sysfs_cmd_request_callback under damon_sysfs_lock */ 2202 int damon_sysfs_schemes_update_regions_start( 2203 struct damon_sysfs_schemes *sysfs_schemes, 2204 struct damon_ctx *ctx, bool total_bytes_only) 2205 { 2206 damon_sysfs_schemes_clear_regions(sysfs_schemes, ctx); 2207 damon_sysfs_schemes_for_damos_callback = sysfs_schemes; 2208 damos_tried_regions_init_upd_status(sysfs_schemes, ctx); 2209 damos_regions_upd_total_bytes_only = total_bytes_only; 2210 ctx->callback.before_damos_apply = damon_sysfs_before_damos_apply; 2211 ctx->callback.after_sampling = damon_sysfs_after_sampling; 2212 return 0; 2213 } 2214 2215 bool damos_sysfs_regions_upd_done(void) 2216 { 2217 struct damon_sysfs_schemes *sysfs_schemes = 2218 damon_sysfs_schemes_for_damos_callback; 2219 struct damon_sysfs_scheme_regions *sysfs_regions; 2220 int i; 2221 2222 for (i = 0; i < sysfs_schemes->nr; i++) { 2223 sysfs_regions = sysfs_schemes->schemes_arr[i]->tried_regions; 2224 if (sysfs_regions->upd_status != 2225 DAMOS_TRIED_REGIONS_UPD_FINISHED) 2226 return false; 2227 } 2228 return true; 2229 } 2230 2231 /* 2232 * Called from damon_sysfs_cmd_request_callback under damon_sysfs_lock. Caller 2233 * should unlock damon_sysfs_lock which held before 2234 * damon_sysfs_schemes_update_regions_start() 2235 */ 2236 int damon_sysfs_schemes_update_regions_stop(struct damon_ctx *ctx) 2237 { 2238 damon_sysfs_schemes_for_damos_callback = NULL; 2239 ctx->callback.before_damos_apply = NULL; 2240 ctx->callback.after_sampling = NULL; 2241 damon_sysfs_schemes_region_idx = 0; 2242 return 0; 2243 } 2244