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 | size: 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(list: &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, fmt: "%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, fmt: "%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, fmt: "%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, fmt: "%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(entry: ®ion->list); |
82 | kfree(objp: 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() |
131 | * callback. |
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() or ->after_aggregation() callback |
136 | * (damon_sysfs_cmd_request_callback()) after the call is called only after |
137 | * the scheme is completely applied to the given snapshot. Hence the callback |
138 | * knows the situation by showing 'started' status, and sets the status as |
139 | * 'finished'. Then, damon_sysfs_before_damos_apply() understands the |
140 | * situation by showing the '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(size: sizeof(*regions), |
171 | GFP_KERNEL); |
172 | |
173 | if (!regions) |
174 | return NULL; |
175 | |
176 | regions->kobj = (struct kobject){}; |
177 | INIT_LIST_HEAD(list: ®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, fmt: "%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(kobj: &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(size: 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, fmt: "%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, fmt: "%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, fmt: "%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, fmt: "%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, fmt: "%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(size: 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, fmt: "%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(s1: buf, s2: 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, fmt: "%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(s: buf, res: &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, fmt: "%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(size: 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, fmt: "%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(s: buf, base: 0, res: &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, fmt: "%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(s: buf, base: 0, res: &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, fmt: "%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(s: buf, base: 0, res: &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(objp: filter->memcg_path); |
491 | kfree(objp: 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(size: 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(kobj: &filters_arr[i]->kobj); |
553 | filters->nr = 0; |
554 | kfree(objp: 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(n: nr_filters, size: 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(kobj: &filter->kobj, |
582 | ktype: &damon_sysfs_scheme_filter_ktype, |
583 | parent: &filters->kobj, fmt: "%d" , i); |
584 | if (err) { |
585 | kobject_put(kobj: &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, fmt: "%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(s: buf, base: 0, res: &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(lock: &damon_sysfs_lock)) |
619 | return -EBUSY; |
620 | err = damon_sysfs_scheme_filters_add_dirs(filters, nr_filters: nr); |
621 | mutex_unlock(lock: &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 | size: 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, fmt: "%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(s1: buf, s2: 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, fmt: "%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(s: buf, base: 0, res: &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, fmt: "%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(s: buf, base: 0, res: &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, fmt: "%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(s: buf, base: 0, res: &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, fmt: "%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(s: buf, base: 0, res: &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 | enum damos_quota_goal_metric metric; |
830 | unsigned long target_value; |
831 | unsigned long current_value; |
832 | }; |
833 | |
834 | /* This should match with enum damos_action */ |
835 | static const char * const damos_sysfs_quota_goal_metric_strs[] = { |
836 | "user_input" , |
837 | "some_mem_psi_us" , |
838 | }; |
839 | |
840 | static struct damos_sysfs_quota_goal *damos_sysfs_quota_goal_alloc(void) |
841 | { |
842 | return kzalloc(size: sizeof(struct damos_sysfs_quota_goal), GFP_KERNEL); |
843 | } |
844 | |
845 | static ssize_t target_metric_show(struct kobject *kobj, |
846 | struct kobj_attribute *attr, char *buf) |
847 | { |
848 | struct damos_sysfs_quota_goal *goal = container_of(kobj, |
849 | struct damos_sysfs_quota_goal, kobj); |
850 | |
851 | return sysfs_emit(buf, fmt: "%s\n" , |
852 | damos_sysfs_quota_goal_metric_strs[goal->metric]); |
853 | } |
854 | |
855 | static ssize_t target_metric_store(struct kobject *kobj, |
856 | struct kobj_attribute *attr, const char *buf, size_t count) |
857 | { |
858 | struct damos_sysfs_quota_goal *goal = container_of(kobj, |
859 | struct damos_sysfs_quota_goal, kobj); |
860 | enum damos_quota_goal_metric m; |
861 | |
862 | for (m = 0; m < NR_DAMOS_QUOTA_GOAL_METRICS; m++) { |
863 | if (sysfs_streq(s1: buf, s2: damos_sysfs_quota_goal_metric_strs[m])) { |
864 | goal->metric = m; |
865 | return count; |
866 | } |
867 | } |
868 | return -EINVAL; |
869 | } |
870 | |
871 | static ssize_t target_value_show(struct kobject *kobj, |
872 | struct kobj_attribute *attr, char *buf) |
873 | { |
874 | struct damos_sysfs_quota_goal *goal = container_of(kobj, struct |
875 | damos_sysfs_quota_goal, kobj); |
876 | |
877 | return sysfs_emit(buf, fmt: "%lu\n" , goal->target_value); |
878 | } |
879 | |
880 | static ssize_t target_value_store(struct kobject *kobj, |
881 | struct kobj_attribute *attr, const char *buf, size_t count) |
882 | { |
883 | struct damos_sysfs_quota_goal *goal = container_of(kobj, struct |
884 | damos_sysfs_quota_goal, kobj); |
885 | int err = kstrtoul(s: buf, base: 0, res: &goal->target_value); |
886 | |
887 | return err ? err : count; |
888 | } |
889 | |
890 | static ssize_t current_value_show(struct kobject *kobj, |
891 | struct kobj_attribute *attr, char *buf) |
892 | { |
893 | struct damos_sysfs_quota_goal *goal = container_of(kobj, struct |
894 | damos_sysfs_quota_goal, kobj); |
895 | |
896 | return sysfs_emit(buf, fmt: "%lu\n" , goal->current_value); |
897 | } |
898 | |
899 | static ssize_t current_value_store(struct kobject *kobj, |
900 | struct kobj_attribute *attr, const char *buf, size_t count) |
901 | { |
902 | struct damos_sysfs_quota_goal *goal = container_of(kobj, struct |
903 | damos_sysfs_quota_goal, kobj); |
904 | int err = kstrtoul(s: buf, base: 0, res: &goal->current_value); |
905 | |
906 | /* feed callback should check existence of this file and read value */ |
907 | return err ? err : count; |
908 | } |
909 | |
910 | static void damos_sysfs_quota_goal_release(struct kobject *kobj) |
911 | { |
912 | /* or, notify this release to the feed callback */ |
913 | kfree(container_of(kobj, struct damos_sysfs_quota_goal, kobj)); |
914 | } |
915 | |
916 | static struct kobj_attribute damos_sysfs_quota_goal_target_metric_attr = |
917 | __ATTR_RW_MODE(target_metric, 0600); |
918 | |
919 | static struct kobj_attribute damos_sysfs_quota_goal_target_value_attr = |
920 | __ATTR_RW_MODE(target_value, 0600); |
921 | |
922 | static struct kobj_attribute damos_sysfs_quota_goal_current_value_attr = |
923 | __ATTR_RW_MODE(current_value, 0600); |
924 | |
925 | static struct attribute *damos_sysfs_quota_goal_attrs[] = { |
926 | &damos_sysfs_quota_goal_target_metric_attr.attr, |
927 | &damos_sysfs_quota_goal_target_value_attr.attr, |
928 | &damos_sysfs_quota_goal_current_value_attr.attr, |
929 | NULL, |
930 | }; |
931 | ATTRIBUTE_GROUPS(damos_sysfs_quota_goal); |
932 | |
933 | static const struct kobj_type damos_sysfs_quota_goal_ktype = { |
934 | .release = damos_sysfs_quota_goal_release, |
935 | .sysfs_ops = &kobj_sysfs_ops, |
936 | .default_groups = damos_sysfs_quota_goal_groups, |
937 | }; |
938 | |
939 | /* |
940 | * quota goals directory |
941 | */ |
942 | |
943 | struct damos_sysfs_quota_goals { |
944 | struct kobject kobj; |
945 | struct damos_sysfs_quota_goal **goals_arr; /* counted by nr */ |
946 | int nr; |
947 | }; |
948 | |
949 | static struct damos_sysfs_quota_goals *damos_sysfs_quota_goals_alloc(void) |
950 | { |
951 | return kzalloc(size: sizeof(struct damos_sysfs_quota_goals), GFP_KERNEL); |
952 | } |
953 | |
954 | static void damos_sysfs_quota_goals_rm_dirs( |
955 | struct damos_sysfs_quota_goals *goals) |
956 | { |
957 | struct damos_sysfs_quota_goal **goals_arr = goals->goals_arr; |
958 | int i; |
959 | |
960 | for (i = 0; i < goals->nr; i++) |
961 | kobject_put(kobj: &goals_arr[i]->kobj); |
962 | goals->nr = 0; |
963 | kfree(objp: goals_arr); |
964 | goals->goals_arr = NULL; |
965 | } |
966 | |
967 | static int damos_sysfs_quota_goals_add_dirs( |
968 | struct damos_sysfs_quota_goals *goals, int nr_goals) |
969 | { |
970 | struct damos_sysfs_quota_goal **goals_arr, *goal; |
971 | int err, i; |
972 | |
973 | damos_sysfs_quota_goals_rm_dirs(goals); |
974 | if (!nr_goals) |
975 | return 0; |
976 | |
977 | goals_arr = kmalloc_array(n: nr_goals, size: sizeof(*goals_arr), |
978 | GFP_KERNEL | __GFP_NOWARN); |
979 | if (!goals_arr) |
980 | return -ENOMEM; |
981 | goals->goals_arr = goals_arr; |
982 | |
983 | for (i = 0; i < nr_goals; i++) { |
984 | goal = damos_sysfs_quota_goal_alloc(); |
985 | if (!goal) { |
986 | damos_sysfs_quota_goals_rm_dirs(goals); |
987 | return -ENOMEM; |
988 | } |
989 | |
990 | err = kobject_init_and_add(kobj: &goal->kobj, |
991 | ktype: &damos_sysfs_quota_goal_ktype, parent: &goals->kobj, |
992 | fmt: "%d" , i); |
993 | if (err) { |
994 | kobject_put(kobj: &goal->kobj); |
995 | damos_sysfs_quota_goals_rm_dirs(goals); |
996 | return err; |
997 | } |
998 | |
999 | goals_arr[i] = goal; |
1000 | goals->nr++; |
1001 | } |
1002 | return 0; |
1003 | } |
1004 | |
1005 | static ssize_t nr_goals_show(struct kobject *kobj, |
1006 | struct kobj_attribute *attr, char *buf) |
1007 | { |
1008 | struct damos_sysfs_quota_goals *goals = container_of(kobj, |
1009 | struct damos_sysfs_quota_goals, kobj); |
1010 | |
1011 | return sysfs_emit(buf, fmt: "%d\n" , goals->nr); |
1012 | } |
1013 | |
1014 | static ssize_t nr_goals_store(struct kobject *kobj, |
1015 | struct kobj_attribute *attr, const char *buf, size_t count) |
1016 | { |
1017 | struct damos_sysfs_quota_goals *goals; |
1018 | int nr, err = kstrtoint(s: buf, base: 0, res: &nr); |
1019 | |
1020 | if (err) |
1021 | return err; |
1022 | if (nr < 0) |
1023 | return -EINVAL; |
1024 | |
1025 | goals = container_of(kobj, struct damos_sysfs_quota_goals, kobj); |
1026 | |
1027 | if (!mutex_trylock(lock: &damon_sysfs_lock)) |
1028 | return -EBUSY; |
1029 | err = damos_sysfs_quota_goals_add_dirs(goals, nr_goals: nr); |
1030 | mutex_unlock(lock: &damon_sysfs_lock); |
1031 | if (err) |
1032 | return err; |
1033 | |
1034 | return count; |
1035 | } |
1036 | |
1037 | static void damos_sysfs_quota_goals_release(struct kobject *kobj) |
1038 | { |
1039 | kfree(container_of(kobj, struct damos_sysfs_quota_goals, kobj)); |
1040 | } |
1041 | |
1042 | static struct kobj_attribute damos_sysfs_quota_goals_nr_attr = |
1043 | __ATTR_RW_MODE(nr_goals, 0600); |
1044 | |
1045 | static struct attribute *damos_sysfs_quota_goals_attrs[] = { |
1046 | &damos_sysfs_quota_goals_nr_attr.attr, |
1047 | NULL, |
1048 | }; |
1049 | ATTRIBUTE_GROUPS(damos_sysfs_quota_goals); |
1050 | |
1051 | static const struct kobj_type damos_sysfs_quota_goals_ktype = { |
1052 | .release = damos_sysfs_quota_goals_release, |
1053 | .sysfs_ops = &kobj_sysfs_ops, |
1054 | .default_groups = damos_sysfs_quota_goals_groups, |
1055 | }; |
1056 | |
1057 | /* |
1058 | * scheme/weights directory |
1059 | */ |
1060 | |
1061 | struct damon_sysfs_weights { |
1062 | struct kobject kobj; |
1063 | unsigned int sz; |
1064 | unsigned int nr_accesses; |
1065 | unsigned int age; |
1066 | }; |
1067 | |
1068 | static struct damon_sysfs_weights *damon_sysfs_weights_alloc(unsigned int sz, |
1069 | unsigned int nr_accesses, unsigned int age) |
1070 | { |
1071 | struct damon_sysfs_weights *weights = kmalloc(size: sizeof(*weights), |
1072 | GFP_KERNEL); |
1073 | |
1074 | if (!weights) |
1075 | return NULL; |
1076 | weights->kobj = (struct kobject){}; |
1077 | weights->sz = sz; |
1078 | weights->nr_accesses = nr_accesses; |
1079 | weights->age = age; |
1080 | return weights; |
1081 | } |
1082 | |
1083 | static ssize_t sz_permil_show(struct kobject *kobj, |
1084 | struct kobj_attribute *attr, char *buf) |
1085 | { |
1086 | struct damon_sysfs_weights *weights = container_of(kobj, |
1087 | struct damon_sysfs_weights, kobj); |
1088 | |
1089 | return sysfs_emit(buf, fmt: "%u\n" , weights->sz); |
1090 | } |
1091 | |
1092 | static ssize_t sz_permil_store(struct kobject *kobj, |
1093 | struct kobj_attribute *attr, const char *buf, size_t count) |
1094 | { |
1095 | struct damon_sysfs_weights *weights = container_of(kobj, |
1096 | struct damon_sysfs_weights, kobj); |
1097 | int err = kstrtouint(s: buf, base: 0, res: &weights->sz); |
1098 | |
1099 | return err ? err : count; |
1100 | } |
1101 | |
1102 | static ssize_t nr_accesses_permil_show(struct kobject *kobj, |
1103 | struct kobj_attribute *attr, char *buf) |
1104 | { |
1105 | struct damon_sysfs_weights *weights = container_of(kobj, |
1106 | struct damon_sysfs_weights, kobj); |
1107 | |
1108 | return sysfs_emit(buf, fmt: "%u\n" , weights->nr_accesses); |
1109 | } |
1110 | |
1111 | static ssize_t nr_accesses_permil_store(struct kobject *kobj, |
1112 | struct kobj_attribute *attr, const char *buf, size_t count) |
1113 | { |
1114 | struct damon_sysfs_weights *weights = container_of(kobj, |
1115 | struct damon_sysfs_weights, kobj); |
1116 | int err = kstrtouint(s: buf, base: 0, res: &weights->nr_accesses); |
1117 | |
1118 | return err ? err : count; |
1119 | } |
1120 | |
1121 | static ssize_t age_permil_show(struct kobject *kobj, |
1122 | struct kobj_attribute *attr, char *buf) |
1123 | { |
1124 | struct damon_sysfs_weights *weights = container_of(kobj, |
1125 | struct damon_sysfs_weights, kobj); |
1126 | |
1127 | return sysfs_emit(buf, fmt: "%u\n" , weights->age); |
1128 | } |
1129 | |
1130 | static ssize_t age_permil_store(struct kobject *kobj, |
1131 | struct kobj_attribute *attr, const char *buf, size_t count) |
1132 | { |
1133 | struct damon_sysfs_weights *weights = container_of(kobj, |
1134 | struct damon_sysfs_weights, kobj); |
1135 | int err = kstrtouint(s: buf, base: 0, res: &weights->age); |
1136 | |
1137 | return err ? err : count; |
1138 | } |
1139 | |
1140 | static void damon_sysfs_weights_release(struct kobject *kobj) |
1141 | { |
1142 | kfree(container_of(kobj, struct damon_sysfs_weights, kobj)); |
1143 | } |
1144 | |
1145 | static struct kobj_attribute damon_sysfs_weights_sz_attr = |
1146 | __ATTR_RW_MODE(sz_permil, 0600); |
1147 | |
1148 | static struct kobj_attribute damon_sysfs_weights_nr_accesses_attr = |
1149 | __ATTR_RW_MODE(nr_accesses_permil, 0600); |
1150 | |
1151 | static struct kobj_attribute damon_sysfs_weights_age_attr = |
1152 | __ATTR_RW_MODE(age_permil, 0600); |
1153 | |
1154 | static struct attribute *damon_sysfs_weights_attrs[] = { |
1155 | &damon_sysfs_weights_sz_attr.attr, |
1156 | &damon_sysfs_weights_nr_accesses_attr.attr, |
1157 | &damon_sysfs_weights_age_attr.attr, |
1158 | NULL, |
1159 | }; |
1160 | ATTRIBUTE_GROUPS(damon_sysfs_weights); |
1161 | |
1162 | static const struct kobj_type damon_sysfs_weights_ktype = { |
1163 | .release = damon_sysfs_weights_release, |
1164 | .sysfs_ops = &kobj_sysfs_ops, |
1165 | .default_groups = damon_sysfs_weights_groups, |
1166 | }; |
1167 | |
1168 | /* |
1169 | * quotas directory |
1170 | */ |
1171 | |
1172 | struct damon_sysfs_quotas { |
1173 | struct kobject kobj; |
1174 | struct damon_sysfs_weights *weights; |
1175 | struct damos_sysfs_quota_goals *goals; |
1176 | unsigned long ms; |
1177 | unsigned long sz; |
1178 | unsigned long reset_interval_ms; |
1179 | unsigned long effective_sz; /* Effective size quota in bytes */ |
1180 | }; |
1181 | |
1182 | static struct damon_sysfs_quotas *damon_sysfs_quotas_alloc(void) |
1183 | { |
1184 | return kzalloc(size: sizeof(struct damon_sysfs_quotas), GFP_KERNEL); |
1185 | } |
1186 | |
1187 | static int damon_sysfs_quotas_add_dirs(struct damon_sysfs_quotas *quotas) |
1188 | { |
1189 | struct damon_sysfs_weights *weights; |
1190 | struct damos_sysfs_quota_goals *goals; |
1191 | int err; |
1192 | |
1193 | weights = damon_sysfs_weights_alloc(sz: 0, nr_accesses: 0, age: 0); |
1194 | if (!weights) |
1195 | return -ENOMEM; |
1196 | |
1197 | err = kobject_init_and_add(kobj: &weights->kobj, ktype: &damon_sysfs_weights_ktype, |
1198 | parent: "as->kobj, fmt: "weights" ); |
1199 | if (err) { |
1200 | kobject_put(kobj: &weights->kobj); |
1201 | return err; |
1202 | } |
1203 | quotas->weights = weights; |
1204 | |
1205 | goals = damos_sysfs_quota_goals_alloc(); |
1206 | if (!goals) { |
1207 | kobject_put(kobj: &weights->kobj); |
1208 | return -ENOMEM; |
1209 | } |
1210 | err = kobject_init_and_add(kobj: &goals->kobj, |
1211 | ktype: &damos_sysfs_quota_goals_ktype, parent: "as->kobj, |
1212 | fmt: "goals" ); |
1213 | if (err) { |
1214 | kobject_put(kobj: &weights->kobj); |
1215 | kobject_put(kobj: &goals->kobj); |
1216 | } else { |
1217 | quotas->goals = goals; |
1218 | } |
1219 | |
1220 | return err; |
1221 | } |
1222 | |
1223 | static void damon_sysfs_quotas_rm_dirs(struct damon_sysfs_quotas *quotas) |
1224 | { |
1225 | kobject_put(kobj: "as->weights->kobj); |
1226 | damos_sysfs_quota_goals_rm_dirs(goals: quotas->goals); |
1227 | kobject_put(kobj: "as->goals->kobj); |
1228 | } |
1229 | |
1230 | static ssize_t ms_show(struct kobject *kobj, struct kobj_attribute *attr, |
1231 | char *buf) |
1232 | { |
1233 | struct damon_sysfs_quotas *quotas = container_of(kobj, |
1234 | struct damon_sysfs_quotas, kobj); |
1235 | |
1236 | return sysfs_emit(buf, fmt: "%lu\n" , quotas->ms); |
1237 | } |
1238 | |
1239 | static ssize_t ms_store(struct kobject *kobj, struct kobj_attribute *attr, |
1240 | const char *buf, size_t count) |
1241 | { |
1242 | struct damon_sysfs_quotas *quotas = container_of(kobj, |
1243 | struct damon_sysfs_quotas, kobj); |
1244 | int err = kstrtoul(s: buf, base: 0, res: "as->ms); |
1245 | |
1246 | if (err) |
1247 | return -EINVAL; |
1248 | return count; |
1249 | } |
1250 | |
1251 | static ssize_t bytes_show(struct kobject *kobj, struct kobj_attribute *attr, |
1252 | char *buf) |
1253 | { |
1254 | struct damon_sysfs_quotas *quotas = container_of(kobj, |
1255 | struct damon_sysfs_quotas, kobj); |
1256 | |
1257 | return sysfs_emit(buf, fmt: "%lu\n" , quotas->sz); |
1258 | } |
1259 | |
1260 | static ssize_t bytes_store(struct kobject *kobj, |
1261 | struct kobj_attribute *attr, const char *buf, size_t count) |
1262 | { |
1263 | struct damon_sysfs_quotas *quotas = container_of(kobj, |
1264 | struct damon_sysfs_quotas, kobj); |
1265 | int err = kstrtoul(s: buf, base: 0, res: "as->sz); |
1266 | |
1267 | if (err) |
1268 | return -EINVAL; |
1269 | return count; |
1270 | } |
1271 | |
1272 | static ssize_t reset_interval_ms_show(struct kobject *kobj, |
1273 | struct kobj_attribute *attr, char *buf) |
1274 | { |
1275 | struct damon_sysfs_quotas *quotas = container_of(kobj, |
1276 | struct damon_sysfs_quotas, kobj); |
1277 | |
1278 | return sysfs_emit(buf, fmt: "%lu\n" , quotas->reset_interval_ms); |
1279 | } |
1280 | |
1281 | static ssize_t reset_interval_ms_store(struct kobject *kobj, |
1282 | struct kobj_attribute *attr, const char *buf, size_t count) |
1283 | { |
1284 | struct damon_sysfs_quotas *quotas = container_of(kobj, |
1285 | struct damon_sysfs_quotas, kobj); |
1286 | int err = kstrtoul(s: buf, base: 0, res: "as->reset_interval_ms); |
1287 | |
1288 | if (err) |
1289 | return -EINVAL; |
1290 | return count; |
1291 | } |
1292 | |
1293 | static ssize_t effective_bytes_show(struct kobject *kobj, |
1294 | struct kobj_attribute *attr, char *buf) |
1295 | { |
1296 | struct damon_sysfs_quotas *quotas = container_of(kobj, |
1297 | struct damon_sysfs_quotas, kobj); |
1298 | |
1299 | return sysfs_emit(buf, fmt: "%lu\n" , quotas->effective_sz); |
1300 | } |
1301 | |
1302 | static void damon_sysfs_quotas_release(struct kobject *kobj) |
1303 | { |
1304 | kfree(container_of(kobj, struct damon_sysfs_quotas, kobj)); |
1305 | } |
1306 | |
1307 | static struct kobj_attribute damon_sysfs_quotas_ms_attr = |
1308 | __ATTR_RW_MODE(ms, 0600); |
1309 | |
1310 | static struct kobj_attribute damon_sysfs_quotas_sz_attr = |
1311 | __ATTR_RW_MODE(bytes, 0600); |
1312 | |
1313 | static struct kobj_attribute damon_sysfs_quotas_reset_interval_ms_attr = |
1314 | __ATTR_RW_MODE(reset_interval_ms, 0600); |
1315 | |
1316 | static struct kobj_attribute damon_sysfs_quotas_effective_bytes_attr = |
1317 | __ATTR_RO_MODE(effective_bytes, 0400); |
1318 | |
1319 | static struct attribute *damon_sysfs_quotas_attrs[] = { |
1320 | &damon_sysfs_quotas_ms_attr.attr, |
1321 | &damon_sysfs_quotas_sz_attr.attr, |
1322 | &damon_sysfs_quotas_reset_interval_ms_attr.attr, |
1323 | &damon_sysfs_quotas_effective_bytes_attr.attr, |
1324 | NULL, |
1325 | }; |
1326 | ATTRIBUTE_GROUPS(damon_sysfs_quotas); |
1327 | |
1328 | static const struct kobj_type damon_sysfs_quotas_ktype = { |
1329 | .release = damon_sysfs_quotas_release, |
1330 | .sysfs_ops = &kobj_sysfs_ops, |
1331 | .default_groups = damon_sysfs_quotas_groups, |
1332 | }; |
1333 | |
1334 | /* |
1335 | * access_pattern directory |
1336 | */ |
1337 | |
1338 | struct damon_sysfs_access_pattern { |
1339 | struct kobject kobj; |
1340 | struct damon_sysfs_ul_range *sz; |
1341 | struct damon_sysfs_ul_range *nr_accesses; |
1342 | struct damon_sysfs_ul_range *age; |
1343 | }; |
1344 | |
1345 | static |
1346 | struct damon_sysfs_access_pattern *damon_sysfs_access_pattern_alloc(void) |
1347 | { |
1348 | struct damon_sysfs_access_pattern *access_pattern = |
1349 | kmalloc(size: sizeof(*access_pattern), GFP_KERNEL); |
1350 | |
1351 | if (!access_pattern) |
1352 | return NULL; |
1353 | access_pattern->kobj = (struct kobject){}; |
1354 | return access_pattern; |
1355 | } |
1356 | |
1357 | static int damon_sysfs_access_pattern_add_range_dir( |
1358 | struct damon_sysfs_access_pattern *access_pattern, |
1359 | struct damon_sysfs_ul_range **range_dir_ptr, |
1360 | char *name) |
1361 | { |
1362 | struct damon_sysfs_ul_range *range = damon_sysfs_ul_range_alloc(min: 0, max: 0); |
1363 | int err; |
1364 | |
1365 | if (!range) |
1366 | return -ENOMEM; |
1367 | err = kobject_init_and_add(kobj: &range->kobj, ktype: &damon_sysfs_ul_range_ktype, |
1368 | parent: &access_pattern->kobj, fmt: name); |
1369 | if (err) |
1370 | kobject_put(kobj: &range->kobj); |
1371 | else |
1372 | *range_dir_ptr = range; |
1373 | return err; |
1374 | } |
1375 | |
1376 | static int damon_sysfs_access_pattern_add_dirs( |
1377 | struct damon_sysfs_access_pattern *access_pattern) |
1378 | { |
1379 | int err; |
1380 | |
1381 | err = damon_sysfs_access_pattern_add_range_dir(access_pattern, |
1382 | range_dir_ptr: &access_pattern->sz, name: "sz" ); |
1383 | if (err) |
1384 | goto put_sz_out; |
1385 | |
1386 | err = damon_sysfs_access_pattern_add_range_dir(access_pattern, |
1387 | range_dir_ptr: &access_pattern->nr_accesses, name: "nr_accesses" ); |
1388 | if (err) |
1389 | goto put_nr_accesses_sz_out; |
1390 | |
1391 | err = damon_sysfs_access_pattern_add_range_dir(access_pattern, |
1392 | range_dir_ptr: &access_pattern->age, name: "age" ); |
1393 | if (err) |
1394 | goto put_age_nr_accesses_sz_out; |
1395 | return 0; |
1396 | |
1397 | put_age_nr_accesses_sz_out: |
1398 | kobject_put(kobj: &access_pattern->age->kobj); |
1399 | access_pattern->age = NULL; |
1400 | put_nr_accesses_sz_out: |
1401 | kobject_put(kobj: &access_pattern->nr_accesses->kobj); |
1402 | access_pattern->nr_accesses = NULL; |
1403 | put_sz_out: |
1404 | kobject_put(kobj: &access_pattern->sz->kobj); |
1405 | access_pattern->sz = NULL; |
1406 | return err; |
1407 | } |
1408 | |
1409 | static void damon_sysfs_access_pattern_rm_dirs( |
1410 | struct damon_sysfs_access_pattern *access_pattern) |
1411 | { |
1412 | kobject_put(kobj: &access_pattern->sz->kobj); |
1413 | kobject_put(kobj: &access_pattern->nr_accesses->kobj); |
1414 | kobject_put(kobj: &access_pattern->age->kobj); |
1415 | } |
1416 | |
1417 | static void damon_sysfs_access_pattern_release(struct kobject *kobj) |
1418 | { |
1419 | kfree(container_of(kobj, struct damon_sysfs_access_pattern, kobj)); |
1420 | } |
1421 | |
1422 | static struct attribute *damon_sysfs_access_pattern_attrs[] = { |
1423 | NULL, |
1424 | }; |
1425 | ATTRIBUTE_GROUPS(damon_sysfs_access_pattern); |
1426 | |
1427 | static const struct kobj_type damon_sysfs_access_pattern_ktype = { |
1428 | .release = damon_sysfs_access_pattern_release, |
1429 | .sysfs_ops = &kobj_sysfs_ops, |
1430 | .default_groups = damon_sysfs_access_pattern_groups, |
1431 | }; |
1432 | |
1433 | /* |
1434 | * scheme directory |
1435 | */ |
1436 | |
1437 | struct damon_sysfs_scheme { |
1438 | struct kobject kobj; |
1439 | enum damos_action action; |
1440 | struct damon_sysfs_access_pattern *access_pattern; |
1441 | unsigned long apply_interval_us; |
1442 | struct damon_sysfs_quotas *quotas; |
1443 | struct damon_sysfs_watermarks *watermarks; |
1444 | struct damon_sysfs_scheme_filters *filters; |
1445 | struct damon_sysfs_stats *stats; |
1446 | struct damon_sysfs_scheme_regions *tried_regions; |
1447 | }; |
1448 | |
1449 | /* This should match with enum damos_action */ |
1450 | static const char * const damon_sysfs_damos_action_strs[] = { |
1451 | "willneed" , |
1452 | "cold" , |
1453 | "pageout" , |
1454 | "hugepage" , |
1455 | "nohugepage" , |
1456 | "lru_prio" , |
1457 | "lru_deprio" , |
1458 | "stat" , |
1459 | }; |
1460 | |
1461 | static struct damon_sysfs_scheme *damon_sysfs_scheme_alloc( |
1462 | enum damos_action action, unsigned long apply_interval_us) |
1463 | { |
1464 | struct damon_sysfs_scheme *scheme = kmalloc(size: sizeof(*scheme), |
1465 | GFP_KERNEL); |
1466 | |
1467 | if (!scheme) |
1468 | return NULL; |
1469 | scheme->kobj = (struct kobject){}; |
1470 | scheme->action = action; |
1471 | scheme->apply_interval_us = apply_interval_us; |
1472 | return scheme; |
1473 | } |
1474 | |
1475 | static int damon_sysfs_scheme_set_access_pattern( |
1476 | struct damon_sysfs_scheme *scheme) |
1477 | { |
1478 | struct damon_sysfs_access_pattern *access_pattern; |
1479 | int err; |
1480 | |
1481 | access_pattern = damon_sysfs_access_pattern_alloc(); |
1482 | if (!access_pattern) |
1483 | return -ENOMEM; |
1484 | err = kobject_init_and_add(kobj: &access_pattern->kobj, |
1485 | ktype: &damon_sysfs_access_pattern_ktype, parent: &scheme->kobj, |
1486 | fmt: "access_pattern" ); |
1487 | if (err) |
1488 | goto out; |
1489 | err = damon_sysfs_access_pattern_add_dirs(access_pattern); |
1490 | if (err) |
1491 | goto out; |
1492 | scheme->access_pattern = access_pattern; |
1493 | return 0; |
1494 | |
1495 | out: |
1496 | kobject_put(kobj: &access_pattern->kobj); |
1497 | return err; |
1498 | } |
1499 | |
1500 | static int damon_sysfs_scheme_set_quotas(struct damon_sysfs_scheme *scheme) |
1501 | { |
1502 | struct damon_sysfs_quotas *quotas = damon_sysfs_quotas_alloc(); |
1503 | int err; |
1504 | |
1505 | if (!quotas) |
1506 | return -ENOMEM; |
1507 | err = kobject_init_and_add(kobj: "as->kobj, ktype: &damon_sysfs_quotas_ktype, |
1508 | parent: &scheme->kobj, fmt: "quotas" ); |
1509 | if (err) |
1510 | goto out; |
1511 | err = damon_sysfs_quotas_add_dirs(quotas); |
1512 | if (err) |
1513 | goto out; |
1514 | scheme->quotas = quotas; |
1515 | return 0; |
1516 | |
1517 | out: |
1518 | kobject_put(kobj: "as->kobj); |
1519 | return err; |
1520 | } |
1521 | |
1522 | static int damon_sysfs_scheme_set_watermarks(struct damon_sysfs_scheme *scheme) |
1523 | { |
1524 | struct damon_sysfs_watermarks *watermarks = |
1525 | damon_sysfs_watermarks_alloc(metric: DAMOS_WMARK_NONE, interval_us: 0, high: 0, mid: 0, low: 0); |
1526 | int err; |
1527 | |
1528 | if (!watermarks) |
1529 | return -ENOMEM; |
1530 | err = kobject_init_and_add(kobj: &watermarks->kobj, |
1531 | ktype: &damon_sysfs_watermarks_ktype, parent: &scheme->kobj, |
1532 | fmt: "watermarks" ); |
1533 | if (err) |
1534 | kobject_put(kobj: &watermarks->kobj); |
1535 | else |
1536 | scheme->watermarks = watermarks; |
1537 | return err; |
1538 | } |
1539 | |
1540 | static int damon_sysfs_scheme_set_filters(struct damon_sysfs_scheme *scheme) |
1541 | { |
1542 | struct damon_sysfs_scheme_filters *filters = |
1543 | damon_sysfs_scheme_filters_alloc(); |
1544 | int err; |
1545 | |
1546 | if (!filters) |
1547 | return -ENOMEM; |
1548 | err = kobject_init_and_add(kobj: &filters->kobj, |
1549 | ktype: &damon_sysfs_scheme_filters_ktype, parent: &scheme->kobj, |
1550 | fmt: "filters" ); |
1551 | if (err) |
1552 | kobject_put(kobj: &filters->kobj); |
1553 | else |
1554 | scheme->filters = filters; |
1555 | return err; |
1556 | } |
1557 | |
1558 | static int damon_sysfs_scheme_set_stats(struct damon_sysfs_scheme *scheme) |
1559 | { |
1560 | struct damon_sysfs_stats *stats = damon_sysfs_stats_alloc(); |
1561 | int err; |
1562 | |
1563 | if (!stats) |
1564 | return -ENOMEM; |
1565 | err = kobject_init_and_add(kobj: &stats->kobj, ktype: &damon_sysfs_stats_ktype, |
1566 | parent: &scheme->kobj, fmt: "stats" ); |
1567 | if (err) |
1568 | kobject_put(kobj: &stats->kobj); |
1569 | else |
1570 | scheme->stats = stats; |
1571 | return err; |
1572 | } |
1573 | |
1574 | static int damon_sysfs_scheme_set_tried_regions( |
1575 | struct damon_sysfs_scheme *scheme) |
1576 | { |
1577 | struct damon_sysfs_scheme_regions *tried_regions = |
1578 | damon_sysfs_scheme_regions_alloc(); |
1579 | int err; |
1580 | |
1581 | if (!tried_regions) |
1582 | return -ENOMEM; |
1583 | err = kobject_init_and_add(kobj: &tried_regions->kobj, |
1584 | ktype: &damon_sysfs_scheme_regions_ktype, parent: &scheme->kobj, |
1585 | fmt: "tried_regions" ); |
1586 | if (err) |
1587 | kobject_put(kobj: &tried_regions->kobj); |
1588 | else |
1589 | scheme->tried_regions = tried_regions; |
1590 | return err; |
1591 | } |
1592 | |
1593 | static int damon_sysfs_scheme_add_dirs(struct damon_sysfs_scheme *scheme) |
1594 | { |
1595 | int err; |
1596 | |
1597 | err = damon_sysfs_scheme_set_access_pattern(scheme); |
1598 | if (err) |
1599 | return err; |
1600 | err = damon_sysfs_scheme_set_quotas(scheme); |
1601 | if (err) |
1602 | goto put_access_pattern_out; |
1603 | err = damon_sysfs_scheme_set_watermarks(scheme); |
1604 | if (err) |
1605 | goto put_quotas_access_pattern_out; |
1606 | err = damon_sysfs_scheme_set_filters(scheme); |
1607 | if (err) |
1608 | goto put_watermarks_quotas_access_pattern_out; |
1609 | err = damon_sysfs_scheme_set_stats(scheme); |
1610 | if (err) |
1611 | goto put_filters_watermarks_quotas_access_pattern_out; |
1612 | err = damon_sysfs_scheme_set_tried_regions(scheme); |
1613 | if (err) |
1614 | goto put_tried_regions_out; |
1615 | return 0; |
1616 | |
1617 | put_tried_regions_out: |
1618 | kobject_put(kobj: &scheme->tried_regions->kobj); |
1619 | scheme->tried_regions = NULL; |
1620 | put_filters_watermarks_quotas_access_pattern_out: |
1621 | kobject_put(kobj: &scheme->filters->kobj); |
1622 | scheme->filters = NULL; |
1623 | put_watermarks_quotas_access_pattern_out: |
1624 | kobject_put(kobj: &scheme->watermarks->kobj); |
1625 | scheme->watermarks = NULL; |
1626 | put_quotas_access_pattern_out: |
1627 | kobject_put(kobj: &scheme->quotas->kobj); |
1628 | scheme->quotas = NULL; |
1629 | put_access_pattern_out: |
1630 | kobject_put(kobj: &scheme->access_pattern->kobj); |
1631 | scheme->access_pattern = NULL; |
1632 | return err; |
1633 | } |
1634 | |
1635 | static void damon_sysfs_scheme_rm_dirs(struct damon_sysfs_scheme *scheme) |
1636 | { |
1637 | damon_sysfs_access_pattern_rm_dirs(access_pattern: scheme->access_pattern); |
1638 | kobject_put(kobj: &scheme->access_pattern->kobj); |
1639 | damon_sysfs_quotas_rm_dirs(quotas: scheme->quotas); |
1640 | kobject_put(kobj: &scheme->quotas->kobj); |
1641 | kobject_put(kobj: &scheme->watermarks->kobj); |
1642 | damon_sysfs_scheme_filters_rm_dirs(filters: scheme->filters); |
1643 | kobject_put(kobj: &scheme->filters->kobj); |
1644 | kobject_put(kobj: &scheme->stats->kobj); |
1645 | damon_sysfs_scheme_regions_rm_dirs(regions: scheme->tried_regions); |
1646 | kobject_put(kobj: &scheme->tried_regions->kobj); |
1647 | } |
1648 | |
1649 | static ssize_t action_show(struct kobject *kobj, struct kobj_attribute *attr, |
1650 | char *buf) |
1651 | { |
1652 | struct damon_sysfs_scheme *scheme = container_of(kobj, |
1653 | struct damon_sysfs_scheme, kobj); |
1654 | |
1655 | return sysfs_emit(buf, fmt: "%s\n" , |
1656 | damon_sysfs_damos_action_strs[scheme->action]); |
1657 | } |
1658 | |
1659 | static ssize_t action_store(struct kobject *kobj, struct kobj_attribute *attr, |
1660 | const char *buf, size_t count) |
1661 | { |
1662 | struct damon_sysfs_scheme *scheme = container_of(kobj, |
1663 | struct damon_sysfs_scheme, kobj); |
1664 | enum damos_action action; |
1665 | |
1666 | for (action = 0; action < NR_DAMOS_ACTIONS; action++) { |
1667 | if (sysfs_streq(s1: buf, s2: damon_sysfs_damos_action_strs[action])) { |
1668 | scheme->action = action; |
1669 | return count; |
1670 | } |
1671 | } |
1672 | return -EINVAL; |
1673 | } |
1674 | |
1675 | static ssize_t apply_interval_us_show(struct kobject *kobj, |
1676 | struct kobj_attribute *attr, char *buf) |
1677 | { |
1678 | struct damon_sysfs_scheme *scheme = container_of(kobj, |
1679 | struct damon_sysfs_scheme, kobj); |
1680 | |
1681 | return sysfs_emit(buf, fmt: "%lu\n" , scheme->apply_interval_us); |
1682 | } |
1683 | |
1684 | static ssize_t apply_interval_us_store(struct kobject *kobj, |
1685 | struct kobj_attribute *attr, const char *buf, size_t count) |
1686 | { |
1687 | struct damon_sysfs_scheme *scheme = container_of(kobj, |
1688 | struct damon_sysfs_scheme, kobj); |
1689 | int err = kstrtoul(s: buf, base: 0, res: &scheme->apply_interval_us); |
1690 | |
1691 | return err ? err : count; |
1692 | } |
1693 | |
1694 | static void damon_sysfs_scheme_release(struct kobject *kobj) |
1695 | { |
1696 | kfree(container_of(kobj, struct damon_sysfs_scheme, kobj)); |
1697 | } |
1698 | |
1699 | static struct kobj_attribute damon_sysfs_scheme_action_attr = |
1700 | __ATTR_RW_MODE(action, 0600); |
1701 | |
1702 | static struct kobj_attribute damon_sysfs_scheme_apply_interval_us_attr = |
1703 | __ATTR_RW_MODE(apply_interval_us, 0600); |
1704 | |
1705 | static struct attribute *damon_sysfs_scheme_attrs[] = { |
1706 | &damon_sysfs_scheme_action_attr.attr, |
1707 | &damon_sysfs_scheme_apply_interval_us_attr.attr, |
1708 | NULL, |
1709 | }; |
1710 | ATTRIBUTE_GROUPS(damon_sysfs_scheme); |
1711 | |
1712 | static const struct kobj_type damon_sysfs_scheme_ktype = { |
1713 | .release = damon_sysfs_scheme_release, |
1714 | .sysfs_ops = &kobj_sysfs_ops, |
1715 | .default_groups = damon_sysfs_scheme_groups, |
1716 | }; |
1717 | |
1718 | /* |
1719 | * schemes directory |
1720 | */ |
1721 | |
1722 | struct damon_sysfs_schemes *damon_sysfs_schemes_alloc(void) |
1723 | { |
1724 | return kzalloc(size: sizeof(struct damon_sysfs_schemes), GFP_KERNEL); |
1725 | } |
1726 | |
1727 | void damon_sysfs_schemes_rm_dirs(struct damon_sysfs_schemes *schemes) |
1728 | { |
1729 | struct damon_sysfs_scheme **schemes_arr = schemes->schemes_arr; |
1730 | int i; |
1731 | |
1732 | for (i = 0; i < schemes->nr; i++) { |
1733 | damon_sysfs_scheme_rm_dirs(scheme: schemes_arr[i]); |
1734 | kobject_put(kobj: &schemes_arr[i]->kobj); |
1735 | } |
1736 | schemes->nr = 0; |
1737 | kfree(objp: schemes_arr); |
1738 | schemes->schemes_arr = NULL; |
1739 | } |
1740 | |
1741 | static int damon_sysfs_schemes_add_dirs(struct damon_sysfs_schemes *schemes, |
1742 | int nr_schemes) |
1743 | { |
1744 | struct damon_sysfs_scheme **schemes_arr, *scheme; |
1745 | int err, i; |
1746 | |
1747 | damon_sysfs_schemes_rm_dirs(schemes); |
1748 | if (!nr_schemes) |
1749 | return 0; |
1750 | |
1751 | schemes_arr = kmalloc_array(n: nr_schemes, size: sizeof(*schemes_arr), |
1752 | GFP_KERNEL | __GFP_NOWARN); |
1753 | if (!schemes_arr) |
1754 | return -ENOMEM; |
1755 | schemes->schemes_arr = schemes_arr; |
1756 | |
1757 | for (i = 0; i < nr_schemes; i++) { |
1758 | /* |
1759 | * apply_interval_us as 0 means same to aggregation interval |
1760 | * (same to before-apply_interval behavior) |
1761 | */ |
1762 | scheme = damon_sysfs_scheme_alloc(action: DAMOS_STAT, apply_interval_us: 0); |
1763 | if (!scheme) { |
1764 | damon_sysfs_schemes_rm_dirs(schemes); |
1765 | return -ENOMEM; |
1766 | } |
1767 | |
1768 | err = kobject_init_and_add(kobj: &scheme->kobj, |
1769 | ktype: &damon_sysfs_scheme_ktype, parent: &schemes->kobj, |
1770 | fmt: "%d" , i); |
1771 | if (err) |
1772 | goto out; |
1773 | err = damon_sysfs_scheme_add_dirs(scheme); |
1774 | if (err) |
1775 | goto out; |
1776 | |
1777 | schemes_arr[i] = scheme; |
1778 | schemes->nr++; |
1779 | } |
1780 | return 0; |
1781 | |
1782 | out: |
1783 | damon_sysfs_schemes_rm_dirs(schemes); |
1784 | kobject_put(kobj: &scheme->kobj); |
1785 | return err; |
1786 | } |
1787 | |
1788 | static ssize_t nr_schemes_show(struct kobject *kobj, |
1789 | struct kobj_attribute *attr, char *buf) |
1790 | { |
1791 | struct damon_sysfs_schemes *schemes = container_of(kobj, |
1792 | struct damon_sysfs_schemes, kobj); |
1793 | |
1794 | return sysfs_emit(buf, fmt: "%d\n" , schemes->nr); |
1795 | } |
1796 | |
1797 | static ssize_t nr_schemes_store(struct kobject *kobj, |
1798 | struct kobj_attribute *attr, const char *buf, size_t count) |
1799 | { |
1800 | struct damon_sysfs_schemes *schemes; |
1801 | int nr, err = kstrtoint(s: buf, base: 0, res: &nr); |
1802 | |
1803 | if (err) |
1804 | return err; |
1805 | if (nr < 0) |
1806 | return -EINVAL; |
1807 | |
1808 | schemes = container_of(kobj, struct damon_sysfs_schemes, kobj); |
1809 | |
1810 | if (!mutex_trylock(lock: &damon_sysfs_lock)) |
1811 | return -EBUSY; |
1812 | err = damon_sysfs_schemes_add_dirs(schemes, nr_schemes: nr); |
1813 | mutex_unlock(lock: &damon_sysfs_lock); |
1814 | if (err) |
1815 | return err; |
1816 | return count; |
1817 | } |
1818 | |
1819 | static void damon_sysfs_schemes_release(struct kobject *kobj) |
1820 | { |
1821 | kfree(container_of(kobj, struct damon_sysfs_schemes, kobj)); |
1822 | } |
1823 | |
1824 | static struct kobj_attribute damon_sysfs_schemes_nr_attr = |
1825 | __ATTR_RW_MODE(nr_schemes, 0600); |
1826 | |
1827 | static struct attribute *damon_sysfs_schemes_attrs[] = { |
1828 | &damon_sysfs_schemes_nr_attr.attr, |
1829 | NULL, |
1830 | }; |
1831 | ATTRIBUTE_GROUPS(damon_sysfs_schemes); |
1832 | |
1833 | const struct kobj_type damon_sysfs_schemes_ktype = { |
1834 | .release = damon_sysfs_schemes_release, |
1835 | .sysfs_ops = &kobj_sysfs_ops, |
1836 | .default_groups = damon_sysfs_schemes_groups, |
1837 | }; |
1838 | |
1839 | static bool damon_sysfs_memcg_path_eq(struct mem_cgroup *memcg, |
1840 | char *memcg_path_buf, char *path) |
1841 | { |
1842 | #ifdef CONFIG_MEMCG |
1843 | cgroup_path(cgrp: memcg->css.cgroup, buf: memcg_path_buf, PATH_MAX); |
1844 | if (sysfs_streq(s1: memcg_path_buf, s2: path)) |
1845 | return true; |
1846 | #endif /* CONFIG_MEMCG */ |
1847 | return false; |
1848 | } |
1849 | |
1850 | static int damon_sysfs_memcg_path_to_id(char *memcg_path, unsigned short *id) |
1851 | { |
1852 | struct mem_cgroup *memcg; |
1853 | char *path; |
1854 | bool found = false; |
1855 | |
1856 | if (!memcg_path) |
1857 | return -EINVAL; |
1858 | |
1859 | path = kmalloc(size: sizeof(*path) * PATH_MAX, GFP_KERNEL); |
1860 | if (!path) |
1861 | return -ENOMEM; |
1862 | |
1863 | for (memcg = mem_cgroup_iter(NULL, NULL, NULL); memcg; |
1864 | memcg = mem_cgroup_iter(NULL, memcg, NULL)) { |
1865 | /* skip removed memcg */ |
1866 | if (!mem_cgroup_id(memcg)) |
1867 | continue; |
1868 | if (damon_sysfs_memcg_path_eq(memcg, memcg_path_buf: path, path: memcg_path)) { |
1869 | *id = mem_cgroup_id(memcg); |
1870 | found = true; |
1871 | break; |
1872 | } |
1873 | } |
1874 | |
1875 | kfree(objp: path); |
1876 | return found ? 0 : -EINVAL; |
1877 | } |
1878 | |
1879 | static int damon_sysfs_set_scheme_filters(struct damos *scheme, |
1880 | struct damon_sysfs_scheme_filters *sysfs_filters) |
1881 | { |
1882 | int i; |
1883 | struct damos_filter *filter, *next; |
1884 | |
1885 | damos_for_each_filter_safe(filter, next, scheme) |
1886 | damos_destroy_filter(f: filter); |
1887 | |
1888 | for (i = 0; i < sysfs_filters->nr; i++) { |
1889 | struct damon_sysfs_scheme_filter *sysfs_filter = |
1890 | sysfs_filters->filters_arr[i]; |
1891 | struct damos_filter *filter = |
1892 | damos_new_filter(type: sysfs_filter->type, |
1893 | matching: sysfs_filter->matching); |
1894 | int err; |
1895 | |
1896 | if (!filter) |
1897 | return -ENOMEM; |
1898 | if (filter->type == DAMOS_FILTER_TYPE_MEMCG) { |
1899 | err = damon_sysfs_memcg_path_to_id( |
1900 | memcg_path: sysfs_filter->memcg_path, |
1901 | id: &filter->memcg_id); |
1902 | if (err) { |
1903 | damos_destroy_filter(f: filter); |
1904 | return err; |
1905 | } |
1906 | } else if (filter->type == DAMOS_FILTER_TYPE_ADDR) { |
1907 | if (sysfs_filter->addr_range.end < |
1908 | sysfs_filter->addr_range.start) { |
1909 | damos_destroy_filter(f: filter); |
1910 | return -EINVAL; |
1911 | } |
1912 | filter->addr_range = sysfs_filter->addr_range; |
1913 | } else if (filter->type == DAMOS_FILTER_TYPE_TARGET) { |
1914 | filter->target_idx = sysfs_filter->target_idx; |
1915 | } |
1916 | |
1917 | damos_add_filter(s: scheme, f: filter); |
1918 | } |
1919 | return 0; |
1920 | } |
1921 | |
1922 | static int damos_sysfs_set_quota_score( |
1923 | struct damos_sysfs_quota_goals *sysfs_goals, |
1924 | struct damos_quota *quota) |
1925 | { |
1926 | struct damos_quota_goal *goal, *next; |
1927 | int i; |
1928 | |
1929 | damos_for_each_quota_goal_safe(goal, next, quota) |
1930 | damos_destroy_quota_goal(goal); |
1931 | |
1932 | for (i = 0; i < sysfs_goals->nr; i++) { |
1933 | struct damos_sysfs_quota_goal *sysfs_goal = |
1934 | sysfs_goals->goals_arr[i]; |
1935 | |
1936 | if (!sysfs_goal->target_value) |
1937 | continue; |
1938 | |
1939 | goal = damos_new_quota_goal(metric: sysfs_goal->metric, |
1940 | target_value: sysfs_goal->target_value); |
1941 | if (!goal) |
1942 | return -ENOMEM; |
1943 | if (sysfs_goal->metric == DAMOS_QUOTA_USER_INPUT) |
1944 | goal->current_value = sysfs_goal->current_value; |
1945 | damos_add_quota_goal(q: quota, g: goal); |
1946 | } |
1947 | return 0; |
1948 | } |
1949 | |
1950 | int damos_sysfs_set_quota_scores(struct damon_sysfs_schemes *sysfs_schemes, |
1951 | struct damon_ctx *ctx) |
1952 | { |
1953 | struct damos *scheme; |
1954 | int i = 0; |
1955 | |
1956 | damon_for_each_scheme(scheme, ctx) { |
1957 | struct damon_sysfs_scheme *sysfs_scheme; |
1958 | int err; |
1959 | |
1960 | /* user could have removed the scheme sysfs dir */ |
1961 | if (i >= sysfs_schemes->nr) |
1962 | break; |
1963 | |
1964 | sysfs_scheme = sysfs_schemes->schemes_arr[i]; |
1965 | err = damos_sysfs_set_quota_score(sysfs_goals: sysfs_scheme->quotas->goals, |
1966 | quota: &scheme->quota); |
1967 | if (err) |
1968 | /* kdamond will clean up schemes and terminated */ |
1969 | return err; |
1970 | i++; |
1971 | } |
1972 | return 0; |
1973 | } |
1974 | |
1975 | void damos_sysfs_update_effective_quotas( |
1976 | struct damon_sysfs_schemes *sysfs_schemes, |
1977 | struct damon_ctx *ctx) |
1978 | { |
1979 | struct damos *scheme; |
1980 | int schemes_idx = 0; |
1981 | |
1982 | damon_for_each_scheme(scheme, ctx) { |
1983 | struct damon_sysfs_quotas *sysfs_quotas; |
1984 | |
1985 | /* user could have removed the scheme sysfs dir */ |
1986 | if (schemes_idx >= sysfs_schemes->nr) |
1987 | break; |
1988 | |
1989 | sysfs_quotas = |
1990 | sysfs_schemes->schemes_arr[schemes_idx++]->quotas; |
1991 | sysfs_quotas->effective_sz = scheme->quota.esz; |
1992 | } |
1993 | } |
1994 | |
1995 | static struct damos *damon_sysfs_mk_scheme( |
1996 | struct damon_sysfs_scheme *sysfs_scheme) |
1997 | { |
1998 | struct damon_sysfs_access_pattern *access_pattern = |
1999 | sysfs_scheme->access_pattern; |
2000 | struct damon_sysfs_quotas *sysfs_quotas = sysfs_scheme->quotas; |
2001 | struct damon_sysfs_weights *sysfs_weights = sysfs_quotas->weights; |
2002 | struct damon_sysfs_watermarks *sysfs_wmarks = sysfs_scheme->watermarks; |
2003 | struct damon_sysfs_scheme_filters *sysfs_filters = |
2004 | sysfs_scheme->filters; |
2005 | struct damos *scheme; |
2006 | int err; |
2007 | |
2008 | struct damos_access_pattern pattern = { |
2009 | .min_sz_region = access_pattern->sz->min, |
2010 | .max_sz_region = access_pattern->sz->max, |
2011 | .min_nr_accesses = access_pattern->nr_accesses->min, |
2012 | .max_nr_accesses = access_pattern->nr_accesses->max, |
2013 | .min_age_region = access_pattern->age->min, |
2014 | .max_age_region = access_pattern->age->max, |
2015 | }; |
2016 | struct damos_quota quota = { |
2017 | .ms = sysfs_quotas->ms, |
2018 | .sz = sysfs_quotas->sz, |
2019 | .reset_interval = sysfs_quotas->reset_interval_ms, |
2020 | .weight_sz = sysfs_weights->sz, |
2021 | .weight_nr_accesses = sysfs_weights->nr_accesses, |
2022 | .weight_age = sysfs_weights->age, |
2023 | }; |
2024 | struct damos_watermarks wmarks = { |
2025 | .metric = sysfs_wmarks->metric, |
2026 | .interval = sysfs_wmarks->interval_us, |
2027 | .high = sysfs_wmarks->high, |
2028 | .mid = sysfs_wmarks->mid, |
2029 | .low = sysfs_wmarks->low, |
2030 | }; |
2031 | |
2032 | scheme = damon_new_scheme(pattern: &pattern, action: sysfs_scheme->action, |
2033 | apply_interval_us: sysfs_scheme->apply_interval_us, quota: "a, wmarks: &wmarks); |
2034 | if (!scheme) |
2035 | return NULL; |
2036 | |
2037 | err = damos_sysfs_set_quota_score(sysfs_goals: sysfs_quotas->goals, quota: &scheme->quota); |
2038 | if (err) { |
2039 | damon_destroy_scheme(s: scheme); |
2040 | return NULL; |
2041 | } |
2042 | |
2043 | err = damon_sysfs_set_scheme_filters(scheme, sysfs_filters); |
2044 | if (err) { |
2045 | damon_destroy_scheme(s: scheme); |
2046 | return NULL; |
2047 | } |
2048 | return scheme; |
2049 | } |
2050 | |
2051 | static void damon_sysfs_update_scheme(struct damos *scheme, |
2052 | struct damon_sysfs_scheme *sysfs_scheme) |
2053 | { |
2054 | struct damon_sysfs_access_pattern *access_pattern = |
2055 | sysfs_scheme->access_pattern; |
2056 | struct damon_sysfs_quotas *sysfs_quotas = sysfs_scheme->quotas; |
2057 | struct damon_sysfs_weights *sysfs_weights = sysfs_quotas->weights; |
2058 | struct damon_sysfs_watermarks *sysfs_wmarks = sysfs_scheme->watermarks; |
2059 | int err; |
2060 | |
2061 | scheme->pattern.min_sz_region = access_pattern->sz->min; |
2062 | scheme->pattern.max_sz_region = access_pattern->sz->max; |
2063 | scheme->pattern.min_nr_accesses = access_pattern->nr_accesses->min; |
2064 | scheme->pattern.max_nr_accesses = access_pattern->nr_accesses->max; |
2065 | scheme->pattern.min_age_region = access_pattern->age->min; |
2066 | scheme->pattern.max_age_region = access_pattern->age->max; |
2067 | |
2068 | scheme->action = sysfs_scheme->action; |
2069 | scheme->apply_interval_us = sysfs_scheme->apply_interval_us; |
2070 | |
2071 | scheme->quota.ms = sysfs_quotas->ms; |
2072 | scheme->quota.sz = sysfs_quotas->sz; |
2073 | scheme->quota.reset_interval = sysfs_quotas->reset_interval_ms; |
2074 | scheme->quota.weight_sz = sysfs_weights->sz; |
2075 | scheme->quota.weight_nr_accesses = sysfs_weights->nr_accesses; |
2076 | scheme->quota.weight_age = sysfs_weights->age; |
2077 | |
2078 | err = damos_sysfs_set_quota_score(sysfs_goals: sysfs_quotas->goals, quota: &scheme->quota); |
2079 | if (err) { |
2080 | damon_destroy_scheme(s: scheme); |
2081 | return; |
2082 | } |
2083 | |
2084 | scheme->wmarks.metric = sysfs_wmarks->metric; |
2085 | scheme->wmarks.interval = sysfs_wmarks->interval_us; |
2086 | scheme->wmarks.high = sysfs_wmarks->high; |
2087 | scheme->wmarks.mid = sysfs_wmarks->mid; |
2088 | scheme->wmarks.low = sysfs_wmarks->low; |
2089 | |
2090 | err = damon_sysfs_set_scheme_filters(scheme, sysfs_filters: sysfs_scheme->filters); |
2091 | if (err) |
2092 | damon_destroy_scheme(s: scheme); |
2093 | } |
2094 | |
2095 | int damon_sysfs_set_schemes(struct damon_ctx *ctx, |
2096 | struct damon_sysfs_schemes *sysfs_schemes) |
2097 | { |
2098 | struct damos *scheme, *next; |
2099 | int i = 0; |
2100 | |
2101 | damon_for_each_scheme_safe(scheme, next, ctx) { |
2102 | if (i < sysfs_schemes->nr) |
2103 | damon_sysfs_update_scheme(scheme, |
2104 | sysfs_scheme: sysfs_schemes->schemes_arr[i]); |
2105 | else |
2106 | damon_destroy_scheme(s: scheme); |
2107 | i++; |
2108 | } |
2109 | |
2110 | for (; i < sysfs_schemes->nr; i++) { |
2111 | struct damos *scheme, *next; |
2112 | |
2113 | scheme = damon_sysfs_mk_scheme(sysfs_scheme: sysfs_schemes->schemes_arr[i]); |
2114 | if (!scheme) { |
2115 | damon_for_each_scheme_safe(scheme, next, ctx) |
2116 | damon_destroy_scheme(s: scheme); |
2117 | return -ENOMEM; |
2118 | } |
2119 | damon_add_scheme(ctx, s: scheme); |
2120 | } |
2121 | return 0; |
2122 | } |
2123 | |
2124 | void damon_sysfs_schemes_update_stats( |
2125 | struct damon_sysfs_schemes *sysfs_schemes, |
2126 | struct damon_ctx *ctx) |
2127 | { |
2128 | struct damos *scheme; |
2129 | int schemes_idx = 0; |
2130 | |
2131 | damon_for_each_scheme(scheme, ctx) { |
2132 | struct damon_sysfs_stats *sysfs_stats; |
2133 | |
2134 | /* user could have removed the scheme sysfs dir */ |
2135 | if (schemes_idx >= sysfs_schemes->nr) |
2136 | break; |
2137 | |
2138 | sysfs_stats = sysfs_schemes->schemes_arr[schemes_idx++]->stats; |
2139 | sysfs_stats->nr_tried = scheme->stat.nr_tried; |
2140 | sysfs_stats->sz_tried = scheme->stat.sz_tried; |
2141 | sysfs_stats->nr_applied = scheme->stat.nr_applied; |
2142 | sysfs_stats->sz_applied = scheme->stat.sz_applied; |
2143 | sysfs_stats->qt_exceeds = scheme->stat.qt_exceeds; |
2144 | } |
2145 | } |
2146 | |
2147 | /* |
2148 | * damon_sysfs_schemes that need to update its schemes regions dir. Protected |
2149 | * by damon_sysfs_lock |
2150 | */ |
2151 | static struct damon_sysfs_schemes *damon_sysfs_schemes_for_damos_callback; |
2152 | static int damon_sysfs_schemes_region_idx; |
2153 | static bool damos_regions_upd_total_bytes_only; |
2154 | |
2155 | /* |
2156 | * DAMON callback that called before damos apply. While this callback is |
2157 | * registered, damon_sysfs_lock should be held to ensure the regions |
2158 | * directories exist. |
2159 | */ |
2160 | static int damon_sysfs_before_damos_apply(struct damon_ctx *ctx, |
2161 | struct damon_target *t, struct damon_region *r, |
2162 | struct damos *s) |
2163 | { |
2164 | struct damos *scheme; |
2165 | struct damon_sysfs_scheme_regions *sysfs_regions; |
2166 | struct damon_sysfs_scheme_region *region; |
2167 | struct damon_sysfs_schemes *sysfs_schemes = |
2168 | damon_sysfs_schemes_for_damos_callback; |
2169 | int schemes_idx = 0; |
2170 | |
2171 | damon_for_each_scheme(scheme, ctx) { |
2172 | if (scheme == s) |
2173 | break; |
2174 | schemes_idx++; |
2175 | } |
2176 | |
2177 | /* user could have removed the scheme sysfs dir */ |
2178 | if (schemes_idx >= sysfs_schemes->nr) |
2179 | return 0; |
2180 | |
2181 | sysfs_regions = sysfs_schemes->schemes_arr[schemes_idx]->tried_regions; |
2182 | if (sysfs_regions->upd_status == DAMOS_TRIED_REGIONS_UPD_FINISHED) |
2183 | return 0; |
2184 | if (sysfs_regions->upd_status == DAMOS_TRIED_REGIONS_UPD_IDLE) |
2185 | sysfs_regions->upd_status = DAMOS_TRIED_REGIONS_UPD_STARTED; |
2186 | sysfs_regions->total_bytes += r->ar.end - r->ar.start; |
2187 | if (damos_regions_upd_total_bytes_only) |
2188 | return 0; |
2189 | |
2190 | region = damon_sysfs_scheme_region_alloc(region: r); |
2191 | if (!region) |
2192 | return 0; |
2193 | list_add_tail(new: ®ion->list, head: &sysfs_regions->regions_list); |
2194 | sysfs_regions->nr_regions++; |
2195 | if (kobject_init_and_add(kobj: ®ion->kobj, |
2196 | ktype: &damon_sysfs_scheme_region_ktype, |
2197 | parent: &sysfs_regions->kobj, fmt: "%d" , |
2198 | damon_sysfs_schemes_region_idx++)) { |
2199 | kobject_put(kobj: ®ion->kobj); |
2200 | } |
2201 | return 0; |
2202 | } |
2203 | |
2204 | /* |
2205 | * DAMON callback that called after each accesses sampling. While this |
2206 | * callback is registered, damon_sysfs_lock should be held to ensure the |
2207 | * regions directories exist. |
2208 | */ |
2209 | void damos_sysfs_mark_finished_regions_updates(struct damon_ctx *ctx) |
2210 | { |
2211 | struct damon_sysfs_schemes *sysfs_schemes = |
2212 | damon_sysfs_schemes_for_damos_callback; |
2213 | struct damon_sysfs_scheme_regions *sysfs_regions; |
2214 | int i; |
2215 | |
2216 | for (i = 0; i < sysfs_schemes->nr; i++) { |
2217 | sysfs_regions = sysfs_schemes->schemes_arr[i]->tried_regions; |
2218 | if (sysfs_regions->upd_status == |
2219 | DAMOS_TRIED_REGIONS_UPD_STARTED || |
2220 | time_after(jiffies, |
2221 | sysfs_regions->upd_timeout_jiffies)) |
2222 | sysfs_regions->upd_status = |
2223 | DAMOS_TRIED_REGIONS_UPD_FINISHED; |
2224 | } |
2225 | } |
2226 | |
2227 | /* Called from damon_sysfs_cmd_request_callback under damon_sysfs_lock */ |
2228 | int damon_sysfs_schemes_clear_regions( |
2229 | struct damon_sysfs_schemes *sysfs_schemes, |
2230 | struct damon_ctx *ctx) |
2231 | { |
2232 | struct damos *scheme; |
2233 | int schemes_idx = 0; |
2234 | |
2235 | damon_for_each_scheme(scheme, ctx) { |
2236 | struct damon_sysfs_scheme *sysfs_scheme; |
2237 | |
2238 | /* user could have removed the scheme sysfs dir */ |
2239 | if (schemes_idx >= sysfs_schemes->nr) |
2240 | break; |
2241 | |
2242 | sysfs_scheme = sysfs_schemes->schemes_arr[schemes_idx++]; |
2243 | damon_sysfs_scheme_regions_rm_dirs( |
2244 | regions: sysfs_scheme->tried_regions); |
2245 | sysfs_scheme->tried_regions->total_bytes = 0; |
2246 | } |
2247 | return 0; |
2248 | } |
2249 | |
2250 | static struct damos *damos_sysfs_nth_scheme(int n, struct damon_ctx *ctx) |
2251 | { |
2252 | struct damos *scheme; |
2253 | int i = 0; |
2254 | |
2255 | damon_for_each_scheme(scheme, ctx) { |
2256 | if (i == n) |
2257 | return scheme; |
2258 | i++; |
2259 | } |
2260 | return NULL; |
2261 | } |
2262 | |
2263 | static void damos_tried_regions_init_upd_status( |
2264 | struct damon_sysfs_schemes *sysfs_schemes, |
2265 | struct damon_ctx *ctx) |
2266 | { |
2267 | int i; |
2268 | struct damos *scheme; |
2269 | struct damon_sysfs_scheme_regions *sysfs_regions; |
2270 | |
2271 | for (i = 0; i < sysfs_schemes->nr; i++) { |
2272 | sysfs_regions = sysfs_schemes->schemes_arr[i]->tried_regions; |
2273 | scheme = damos_sysfs_nth_scheme(n: i, ctx); |
2274 | if (!scheme) { |
2275 | sysfs_regions->upd_status = |
2276 | DAMOS_TRIED_REGIONS_UPD_FINISHED; |
2277 | continue; |
2278 | } |
2279 | sysfs_regions->upd_status = DAMOS_TRIED_REGIONS_UPD_IDLE; |
2280 | sysfs_regions->upd_timeout_jiffies = jiffies + |
2281 | 2 * usecs_to_jiffies(u: scheme->apply_interval_us ? |
2282 | scheme->apply_interval_us : |
2283 | ctx->attrs.aggr_interval); |
2284 | } |
2285 | } |
2286 | |
2287 | /* Called from damon_sysfs_cmd_request_callback under damon_sysfs_lock */ |
2288 | int damon_sysfs_schemes_update_regions_start( |
2289 | struct damon_sysfs_schemes *sysfs_schemes, |
2290 | struct damon_ctx *ctx, bool total_bytes_only) |
2291 | { |
2292 | damon_sysfs_schemes_clear_regions(sysfs_schemes, ctx); |
2293 | damon_sysfs_schemes_for_damos_callback = sysfs_schemes; |
2294 | damos_tried_regions_init_upd_status(sysfs_schemes, ctx); |
2295 | damos_regions_upd_total_bytes_only = total_bytes_only; |
2296 | ctx->callback.before_damos_apply = damon_sysfs_before_damos_apply; |
2297 | return 0; |
2298 | } |
2299 | |
2300 | bool damos_sysfs_regions_upd_done(void) |
2301 | { |
2302 | struct damon_sysfs_schemes *sysfs_schemes = |
2303 | damon_sysfs_schemes_for_damos_callback; |
2304 | struct damon_sysfs_scheme_regions *sysfs_regions; |
2305 | int i; |
2306 | |
2307 | for (i = 0; i < sysfs_schemes->nr; i++) { |
2308 | sysfs_regions = sysfs_schemes->schemes_arr[i]->tried_regions; |
2309 | if (sysfs_regions->upd_status != |
2310 | DAMOS_TRIED_REGIONS_UPD_FINISHED) |
2311 | return false; |
2312 | } |
2313 | return true; |
2314 | } |
2315 | |
2316 | /* |
2317 | * Called from damon_sysfs_cmd_request_callback under damon_sysfs_lock. Caller |
2318 | * should unlock damon_sysfs_lock which held before |
2319 | * damon_sysfs_schemes_update_regions_start() |
2320 | */ |
2321 | int damon_sysfs_schemes_update_regions_stop(struct damon_ctx *ctx) |
2322 | { |
2323 | damon_sysfs_schemes_for_damos_callback = NULL; |
2324 | ctx->callback.before_damos_apply = NULL; |
2325 | damon_sysfs_schemes_region_idx = 0; |
2326 | return 0; |
2327 | } |
2328 | |