1 // SPDX-License-Identifier: GPL-2.0
3 * DAMON sysfs Interface
5 * Copyright (c) 2022 SeongJae Park <sj@kernel.org>
8 #include <linux/slab.h>
10 #include "sysfs-common.h"
13 * scheme region directory
16 struct damon_sysfs_scheme_region {
18 struct damon_addr_range ar;
19 unsigned int nr_accesses;
21 struct list_head list;
24 static struct damon_sysfs_scheme_region *damon_sysfs_scheme_region_alloc(
25 struct damon_region *region)
27 struct damon_sysfs_scheme_region *sysfs_region = kmalloc(
28 sizeof(*sysfs_region), GFP_KERNEL);
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);
40 static ssize_t start_show(struct kobject *kobj, struct kobj_attribute *attr,
43 struct damon_sysfs_scheme_region *region = container_of(kobj,
44 struct damon_sysfs_scheme_region, kobj);
46 return sysfs_emit(buf, "%lu\n", region->ar.start);
49 static ssize_t end_show(struct kobject *kobj, struct kobj_attribute *attr,
52 struct damon_sysfs_scheme_region *region = container_of(kobj,
53 struct damon_sysfs_scheme_region, kobj);
55 return sysfs_emit(buf, "%lu\n", region->ar.end);
58 static ssize_t nr_accesses_show(struct kobject *kobj,
59 struct kobj_attribute *attr, char *buf)
61 struct damon_sysfs_scheme_region *region = container_of(kobj,
62 struct damon_sysfs_scheme_region, kobj);
64 return sysfs_emit(buf, "%u\n", region->nr_accesses);
67 static ssize_t age_show(struct kobject *kobj, struct kobj_attribute *attr,
70 struct damon_sysfs_scheme_region *region = container_of(kobj,
71 struct damon_sysfs_scheme_region, kobj);
73 return sysfs_emit(buf, "%u\n", region->age);
76 static void damon_sysfs_scheme_region_release(struct kobject *kobj)
78 struct damon_sysfs_scheme_region *region = container_of(kobj,
79 struct damon_sysfs_scheme_region, kobj);
81 list_del(®ion->list);
85 static struct kobj_attribute damon_sysfs_scheme_region_start_attr =
86 __ATTR_RO_MODE(start, 0400);
88 static struct kobj_attribute damon_sysfs_scheme_region_end_attr =
89 __ATTR_RO_MODE(end, 0400);
91 static struct kobj_attribute damon_sysfs_scheme_region_nr_accesses_attr =
92 __ATTR_RO_MODE(nr_accesses, 0400);
94 static struct kobj_attribute damon_sysfs_scheme_region_age_attr =
95 __ATTR_RO_MODE(age, 0400);
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,
104 ATTRIBUTE_GROUPS(damon_sysfs_scheme_region);
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,
113 * scheme regions directory
117 * enum damos_sysfs_regions_upd_status - Represent DAMOS tried regions update
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.
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.
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.
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.
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'.
149 * Finally, the tried regions request handling finisher function
150 * (damon_sysfs_schemes_update_regions_stop()) unregisters the callbacks.
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,
158 struct damon_sysfs_scheme_regions {
160 struct list_head regions_list;
162 unsigned long total_bytes;
163 enum damos_sysfs_regions_upd_status upd_status;
164 unsigned long upd_timeout_jiffies;
167 static struct damon_sysfs_scheme_regions *
168 damon_sysfs_scheme_regions_alloc(void)
170 struct damon_sysfs_scheme_regions *regions = kmalloc(sizeof(*regions),
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;
184 static ssize_t total_bytes_show(struct kobject *kobj,
185 struct kobj_attribute *attr, char *buf)
187 struct damon_sysfs_scheme_regions *regions = container_of(kobj,
188 struct damon_sysfs_scheme_regions, kobj);
190 return sysfs_emit(buf, "%lu\n", regions->total_bytes);
193 static void damon_sysfs_scheme_regions_rm_dirs(
194 struct damon_sysfs_scheme_regions *regions)
196 struct damon_sysfs_scheme_region *r, *next;
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--;
205 static void damon_sysfs_scheme_regions_release(struct kobject *kobj)
207 kfree(container_of(kobj, struct damon_sysfs_scheme_regions, kobj));
210 static struct kobj_attribute damon_sysfs_scheme_regions_total_bytes_attr =
211 __ATTR_RO_MODE(total_bytes, 0400);
213 static struct attribute *damon_sysfs_scheme_regions_attrs[] = {
214 &damon_sysfs_scheme_regions_total_bytes_attr.attr,
217 ATTRIBUTE_GROUPS(damon_sysfs_scheme_regions);
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,
226 * schemes/stats directory
229 struct damon_sysfs_stats {
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;
238 static struct damon_sysfs_stats *damon_sysfs_stats_alloc(void)
240 return kzalloc(sizeof(struct damon_sysfs_stats), GFP_KERNEL);
243 static ssize_t nr_tried_show(struct kobject *kobj, struct kobj_attribute *attr,
246 struct damon_sysfs_stats *stats = container_of(kobj,
247 struct damon_sysfs_stats, kobj);
249 return sysfs_emit(buf, "%lu\n", stats->nr_tried);
252 static ssize_t sz_tried_show(struct kobject *kobj, struct kobj_attribute *attr,
255 struct damon_sysfs_stats *stats = container_of(kobj,
256 struct damon_sysfs_stats, kobj);
258 return sysfs_emit(buf, "%lu\n", stats->sz_tried);
261 static ssize_t nr_applied_show(struct kobject *kobj,
262 struct kobj_attribute *attr, char *buf)
264 struct damon_sysfs_stats *stats = container_of(kobj,
265 struct damon_sysfs_stats, kobj);
267 return sysfs_emit(buf, "%lu\n", stats->nr_applied);
270 static ssize_t sz_applied_show(struct kobject *kobj,
271 struct kobj_attribute *attr, char *buf)
273 struct damon_sysfs_stats *stats = container_of(kobj,
274 struct damon_sysfs_stats, kobj);
276 return sysfs_emit(buf, "%lu\n", stats->sz_applied);
279 static ssize_t qt_exceeds_show(struct kobject *kobj,
280 struct kobj_attribute *attr, char *buf)
282 struct damon_sysfs_stats *stats = container_of(kobj,
283 struct damon_sysfs_stats, kobj);
285 return sysfs_emit(buf, "%lu\n", stats->qt_exceeds);
288 static void damon_sysfs_stats_release(struct kobject *kobj)
290 kfree(container_of(kobj, struct damon_sysfs_stats, kobj));
293 static struct kobj_attribute damon_sysfs_stats_nr_tried_attr =
294 __ATTR_RO_MODE(nr_tried, 0400);
296 static struct kobj_attribute damon_sysfs_stats_sz_tried_attr =
297 __ATTR_RO_MODE(sz_tried, 0400);
299 static struct kobj_attribute damon_sysfs_stats_nr_applied_attr =
300 __ATTR_RO_MODE(nr_applied, 0400);
302 static struct kobj_attribute damon_sysfs_stats_sz_applied_attr =
303 __ATTR_RO_MODE(sz_applied, 0400);
305 static struct kobj_attribute damon_sysfs_stats_qt_exceeds_attr =
306 __ATTR_RO_MODE(qt_exceeds, 0400);
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,
316 ATTRIBUTE_GROUPS(damon_sysfs_stats);
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,
328 struct damon_sysfs_scheme_filter {
330 enum damos_filter_type type;
333 struct damon_addr_range addr_range;
337 static struct damon_sysfs_scheme_filter *damon_sysfs_scheme_filter_alloc(void)
339 return kzalloc(sizeof(struct damon_sysfs_scheme_filter), GFP_KERNEL);
342 /* Should match with enum damos_filter_type */
343 static const char * const damon_sysfs_scheme_filter_type_strs[] = {
350 static ssize_t type_show(struct kobject *kobj,
351 struct kobj_attribute *attr, char *buf)
353 struct damon_sysfs_scheme_filter *filter = container_of(kobj,
354 struct damon_sysfs_scheme_filter, kobj);
356 return sysfs_emit(buf, "%s\n",
357 damon_sysfs_scheme_filter_type_strs[filter->type]);
360 static ssize_t type_store(struct kobject *kobj,
361 struct kobj_attribute *attr, const char *buf, size_t count)
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;
368 for (type = 0; type < NR_DAMOS_FILTER_TYPES; type++) {
369 if (sysfs_streq(buf, damon_sysfs_scheme_filter_type_strs[
379 static ssize_t matching_show(struct kobject *kobj,
380 struct kobj_attribute *attr, char *buf)
382 struct damon_sysfs_scheme_filter *filter = container_of(kobj,
383 struct damon_sysfs_scheme_filter, kobj);
385 return sysfs_emit(buf, "%c\n", filter->matching ? 'Y' : 'N');
388 static ssize_t matching_store(struct kobject *kobj,
389 struct kobj_attribute *attr, const char *buf, size_t count)
391 struct damon_sysfs_scheme_filter *filter = container_of(kobj,
392 struct damon_sysfs_scheme_filter, kobj);
394 int err = kstrtobool(buf, &matching);
399 filter->matching = matching;
403 static ssize_t memcg_path_show(struct kobject *kobj,
404 struct kobj_attribute *attr, char *buf)
406 struct damon_sysfs_scheme_filter *filter = container_of(kobj,
407 struct damon_sysfs_scheme_filter, kobj);
409 return sysfs_emit(buf, "%s\n",
410 filter->memcg_path ? filter->memcg_path : "");
413 static ssize_t memcg_path_store(struct kobject *kobj,
414 struct kobj_attribute *attr, const char *buf, size_t count)
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);
423 strscpy(path, buf, count + 1);
424 filter->memcg_path = path;
428 static ssize_t addr_start_show(struct kobject *kobj,
429 struct kobj_attribute *attr, char *buf)
431 struct damon_sysfs_scheme_filter *filter = container_of(kobj,
432 struct damon_sysfs_scheme_filter, kobj);
434 return sysfs_emit(buf, "%lu\n", filter->addr_range.start);
437 static ssize_t addr_start_store(struct kobject *kobj,
438 struct kobj_attribute *attr, const char *buf, size_t count)
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);
444 return err ? err : count;
447 static ssize_t addr_end_show(struct kobject *kobj,
448 struct kobj_attribute *attr, char *buf)
450 struct damon_sysfs_scheme_filter *filter = container_of(kobj,
451 struct damon_sysfs_scheme_filter, kobj);
453 return sysfs_emit(buf, "%lu\n", filter->addr_range.end);
456 static ssize_t addr_end_store(struct kobject *kobj,
457 struct kobj_attribute *attr, const char *buf, size_t count)
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);
463 return err ? err : count;
466 static ssize_t damon_target_idx_show(struct kobject *kobj,
467 struct kobj_attribute *attr, char *buf)
469 struct damon_sysfs_scheme_filter *filter = container_of(kobj,
470 struct damon_sysfs_scheme_filter, kobj);
472 return sysfs_emit(buf, "%d\n", filter->target_idx);
475 static ssize_t damon_target_idx_store(struct kobject *kobj,
476 struct kobj_attribute *attr, const char *buf, size_t count)
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);
482 return err ? err : count;
485 static void damon_sysfs_scheme_filter_release(struct kobject *kobj)
487 struct damon_sysfs_scheme_filter *filter = container_of(kobj,
488 struct damon_sysfs_scheme_filter, kobj);
490 kfree(filter->memcg_path);
494 static struct kobj_attribute damon_sysfs_scheme_filter_type_attr =
495 __ATTR_RW_MODE(type, 0600);
497 static struct kobj_attribute damon_sysfs_scheme_filter_matching_attr =
498 __ATTR_RW_MODE(matching, 0600);
500 static struct kobj_attribute damon_sysfs_scheme_filter_memcg_path_attr =
501 __ATTR_RW_MODE(memcg_path, 0600);
503 static struct kobj_attribute damon_sysfs_scheme_filter_addr_start_attr =
504 __ATTR_RW_MODE(addr_start, 0600);
506 static struct kobj_attribute damon_sysfs_scheme_filter_addr_end_attr =
507 __ATTR_RW_MODE(addr_end, 0600);
509 static struct kobj_attribute damon_sysfs_scheme_filter_damon_target_idx_attr =
510 __ATTR_RW_MODE(damon_target_idx, 0600);
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,
521 ATTRIBUTE_GROUPS(damon_sysfs_scheme_filter);
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,
533 struct damon_sysfs_scheme_filters {
535 struct damon_sysfs_scheme_filter **filters_arr;
539 static struct damon_sysfs_scheme_filters *
540 damon_sysfs_scheme_filters_alloc(void)
542 return kzalloc(sizeof(struct damon_sysfs_scheme_filters), GFP_KERNEL);
545 static void damon_sysfs_scheme_filters_rm_dirs(
546 struct damon_sysfs_scheme_filters *filters)
548 struct damon_sysfs_scheme_filter **filters_arr = filters->filters_arr;
551 for (i = 0; i < filters->nr; i++)
552 kobject_put(&filters_arr[i]->kobj);
555 filters->filters_arr = NULL;
558 static int damon_sysfs_scheme_filters_add_dirs(
559 struct damon_sysfs_scheme_filters *filters, int nr_filters)
561 struct damon_sysfs_scheme_filter **filters_arr, *filter;
564 damon_sysfs_scheme_filters_rm_dirs(filters);
568 filters_arr = kmalloc_array(nr_filters, sizeof(*filters_arr),
569 GFP_KERNEL | __GFP_NOWARN);
572 filters->filters_arr = filters_arr;
574 for (i = 0; i < nr_filters; i++) {
575 filter = damon_sysfs_scheme_filter_alloc();
577 damon_sysfs_scheme_filters_rm_dirs(filters);
581 err = kobject_init_and_add(&filter->kobj,
582 &damon_sysfs_scheme_filter_ktype,
583 &filters->kobj, "%d", i);
585 kobject_put(&filter->kobj);
586 damon_sysfs_scheme_filters_rm_dirs(filters);
590 filters_arr[i] = filter;
596 static ssize_t nr_filters_show(struct kobject *kobj,
597 struct kobj_attribute *attr, char *buf)
599 struct damon_sysfs_scheme_filters *filters = container_of(kobj,
600 struct damon_sysfs_scheme_filters, kobj);
602 return sysfs_emit(buf, "%d\n", filters->nr);
605 static ssize_t nr_filters_store(struct kobject *kobj,
606 struct kobj_attribute *attr, const char *buf, size_t count)
608 struct damon_sysfs_scheme_filters *filters;
609 int nr, err = kstrtoint(buf, 0, &nr);
616 filters = container_of(kobj, struct damon_sysfs_scheme_filters, kobj);
618 if (!mutex_trylock(&damon_sysfs_lock))
620 err = damon_sysfs_scheme_filters_add_dirs(filters, nr);
621 mutex_unlock(&damon_sysfs_lock);
628 static void damon_sysfs_scheme_filters_release(struct kobject *kobj)
630 kfree(container_of(kobj, struct damon_sysfs_scheme_filters, kobj));
633 static struct kobj_attribute damon_sysfs_scheme_filters_nr_attr =
634 __ATTR_RW_MODE(nr_filters, 0600);
636 static struct attribute *damon_sysfs_scheme_filters_attrs[] = {
637 &damon_sysfs_scheme_filters_nr_attr.attr,
640 ATTRIBUTE_GROUPS(damon_sysfs_scheme_filters);
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,
649 * watermarks directory
652 struct damon_sysfs_watermarks {
654 enum damos_wmark_metric metric;
655 unsigned long interval_us;
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)
665 struct damon_sysfs_watermarks *watermarks = kmalloc(
666 sizeof(*watermarks), GFP_KERNEL);
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;
679 /* Should match with enum damos_wmark_metric */
680 static const char * const damon_sysfs_wmark_metric_strs[] = {
685 static ssize_t metric_show(struct kobject *kobj, struct kobj_attribute *attr,
688 struct damon_sysfs_watermarks *watermarks = container_of(kobj,
689 struct damon_sysfs_watermarks, kobj);
691 return sysfs_emit(buf, "%s\n",
692 damon_sysfs_wmark_metric_strs[watermarks->metric]);
695 static ssize_t metric_store(struct kobject *kobj, struct kobj_attribute *attr,
696 const char *buf, size_t count)
698 struct damon_sysfs_watermarks *watermarks = container_of(kobj,
699 struct damon_sysfs_watermarks, kobj);
700 enum damos_wmark_metric metric;
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;
711 static ssize_t interval_us_show(struct kobject *kobj,
712 struct kobj_attribute *attr, char *buf)
714 struct damon_sysfs_watermarks *watermarks = container_of(kobj,
715 struct damon_sysfs_watermarks, kobj);
717 return sysfs_emit(buf, "%lu\n", watermarks->interval_us);
720 static ssize_t interval_us_store(struct kobject *kobj,
721 struct kobj_attribute *attr, const char *buf, size_t count)
723 struct damon_sysfs_watermarks *watermarks = container_of(kobj,
724 struct damon_sysfs_watermarks, kobj);
725 int err = kstrtoul(buf, 0, &watermarks->interval_us);
727 return err ? err : count;
730 static ssize_t high_show(struct kobject *kobj,
731 struct kobj_attribute *attr, char *buf)
733 struct damon_sysfs_watermarks *watermarks = container_of(kobj,
734 struct damon_sysfs_watermarks, kobj);
736 return sysfs_emit(buf, "%lu\n", watermarks->high);
739 static ssize_t high_store(struct kobject *kobj,
740 struct kobj_attribute *attr, const char *buf, size_t count)
742 struct damon_sysfs_watermarks *watermarks = container_of(kobj,
743 struct damon_sysfs_watermarks, kobj);
744 int err = kstrtoul(buf, 0, &watermarks->high);
746 return err ? err : count;
749 static ssize_t mid_show(struct kobject *kobj,
750 struct kobj_attribute *attr, char *buf)
752 struct damon_sysfs_watermarks *watermarks = container_of(kobj,
753 struct damon_sysfs_watermarks, kobj);
755 return sysfs_emit(buf, "%lu\n", watermarks->mid);
758 static ssize_t mid_store(struct kobject *kobj,
759 struct kobj_attribute *attr, const char *buf, size_t count)
761 struct damon_sysfs_watermarks *watermarks = container_of(kobj,
762 struct damon_sysfs_watermarks, kobj);
763 int err = kstrtoul(buf, 0, &watermarks->mid);
765 return err ? err : count;
768 static ssize_t low_show(struct kobject *kobj,
769 struct kobj_attribute *attr, char *buf)
771 struct damon_sysfs_watermarks *watermarks = container_of(kobj,
772 struct damon_sysfs_watermarks, kobj);
774 return sysfs_emit(buf, "%lu\n", watermarks->low);
777 static ssize_t low_store(struct kobject *kobj,
778 struct kobj_attribute *attr, const char *buf, size_t count)
780 struct damon_sysfs_watermarks *watermarks = container_of(kobj,
781 struct damon_sysfs_watermarks, kobj);
782 int err = kstrtoul(buf, 0, &watermarks->low);
784 return err ? err : count;
787 static void damon_sysfs_watermarks_release(struct kobject *kobj)
789 kfree(container_of(kobj, struct damon_sysfs_watermarks, kobj));
792 static struct kobj_attribute damon_sysfs_watermarks_metric_attr =
793 __ATTR_RW_MODE(metric, 0600);
795 static struct kobj_attribute damon_sysfs_watermarks_interval_us_attr =
796 __ATTR_RW_MODE(interval_us, 0600);
798 static struct kobj_attribute damon_sysfs_watermarks_high_attr =
799 __ATTR_RW_MODE(high, 0600);
801 static struct kobj_attribute damon_sysfs_watermarks_mid_attr =
802 __ATTR_RW_MODE(mid, 0600);
804 static struct kobj_attribute damon_sysfs_watermarks_low_attr =
805 __ATTR_RW_MODE(low, 0600);
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,
815 ATTRIBUTE_GROUPS(damon_sysfs_watermarks);
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,
824 * quota goal directory
827 struct damos_sysfs_quota_goal {
829 unsigned long target_value;
830 unsigned long current_value;
833 static struct damos_sysfs_quota_goal *damos_sysfs_quota_goal_alloc(void)
835 return kzalloc(sizeof(struct damos_sysfs_quota_goal), GFP_KERNEL);
838 static ssize_t target_value_show(struct kobject *kobj,
839 struct kobj_attribute *attr, char *buf)
841 struct damos_sysfs_quota_goal *goal = container_of(kobj, struct
842 damos_sysfs_quota_goal, kobj);
844 return sysfs_emit(buf, "%lu\n", goal->target_value);
847 static ssize_t target_value_store(struct kobject *kobj,
848 struct kobj_attribute *attr, const char *buf, size_t count)
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);
854 return err ? err : count;
857 static ssize_t current_value_show(struct kobject *kobj,
858 struct kobj_attribute *attr, char *buf)
860 struct damos_sysfs_quota_goal *goal = container_of(kobj, struct
861 damos_sysfs_quota_goal, kobj);
863 return sysfs_emit(buf, "%lu\n", goal->current_value);
866 static ssize_t current_value_store(struct kobject *kobj,
867 struct kobj_attribute *attr, const char *buf, size_t count)
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);
873 /* feed callback should check existence of this file and read value */
874 return err ? err : count;
877 static void damos_sysfs_quota_goal_release(struct kobject *kobj)
879 /* or, notify this release to the feed callback */
880 kfree(container_of(kobj, struct damos_sysfs_quota_goal, kobj));
883 static struct kobj_attribute damos_sysfs_quota_goal_target_value_attr =
884 __ATTR_RW_MODE(target_value, 0600);
886 static struct kobj_attribute damos_sysfs_quota_goal_current_value_attr =
887 __ATTR_RW_MODE(current_value, 0600);
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,
894 ATTRIBUTE_GROUPS(damos_sysfs_quota_goal);
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,
903 * quota goals directory
906 struct damos_sysfs_quota_goals {
908 struct damos_sysfs_quota_goal **goals_arr; /* counted by nr */
912 static struct damos_sysfs_quota_goals *damos_sysfs_quota_goals_alloc(void)
914 return kzalloc(sizeof(struct damos_sysfs_quota_goals), GFP_KERNEL);
917 static void damos_sysfs_quota_goals_rm_dirs(
918 struct damos_sysfs_quota_goals *goals)
920 struct damos_sysfs_quota_goal **goals_arr = goals->goals_arr;
923 for (i = 0; i < goals->nr; i++)
924 kobject_put(&goals_arr[i]->kobj);
927 goals->goals_arr = NULL;
930 static int damos_sysfs_quota_goals_add_dirs(
931 struct damos_sysfs_quota_goals *goals, int nr_goals)
933 struct damos_sysfs_quota_goal **goals_arr, *goal;
936 damos_sysfs_quota_goals_rm_dirs(goals);
940 goals_arr = kmalloc_array(nr_goals, sizeof(*goals_arr),
941 GFP_KERNEL | __GFP_NOWARN);
944 goals->goals_arr = goals_arr;
946 for (i = 0; i < nr_goals; i++) {
947 goal = damos_sysfs_quota_goal_alloc();
949 damos_sysfs_quota_goals_rm_dirs(goals);
953 err = kobject_init_and_add(&goal->kobj,
954 &damos_sysfs_quota_goal_ktype, &goals->kobj,
957 kobject_put(&goal->kobj);
958 damos_sysfs_quota_goals_rm_dirs(goals);
968 static ssize_t nr_goals_show(struct kobject *kobj,
969 struct kobj_attribute *attr, char *buf)
971 struct damos_sysfs_quota_goals *goals = container_of(kobj,
972 struct damos_sysfs_quota_goals, kobj);
974 return sysfs_emit(buf, "%d\n", goals->nr);
977 static ssize_t nr_goals_store(struct kobject *kobj,
978 struct kobj_attribute *attr, const char *buf, size_t count)
980 struct damos_sysfs_quota_goals *goals;
981 int nr, err = kstrtoint(buf, 0, &nr);
988 goals = container_of(kobj, struct damos_sysfs_quota_goals, kobj);
990 if (!mutex_trylock(&damon_sysfs_lock))
992 err = damos_sysfs_quota_goals_add_dirs(goals, nr);
993 mutex_unlock(&damon_sysfs_lock);
1000 static void damos_sysfs_quota_goals_release(struct kobject *kobj)
1002 kfree(container_of(kobj, struct damos_sysfs_quota_goals, kobj));
1005 static struct kobj_attribute damos_sysfs_quota_goals_nr_attr =
1006 __ATTR_RW_MODE(nr_goals, 0600);
1008 static struct attribute *damos_sysfs_quota_goals_attrs[] = {
1009 &damos_sysfs_quota_goals_nr_attr.attr,
1012 ATTRIBUTE_GROUPS(damos_sysfs_quota_goals);
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,
1021 * scheme/weights directory
1024 struct damon_sysfs_weights {
1025 struct kobject kobj;
1027 unsigned int nr_accesses;
1031 static struct damon_sysfs_weights *damon_sysfs_weights_alloc(unsigned int sz,
1032 unsigned int nr_accesses, unsigned int age)
1034 struct damon_sysfs_weights *weights = kmalloc(sizeof(*weights),
1039 weights->kobj = (struct kobject){};
1041 weights->nr_accesses = nr_accesses;
1046 static ssize_t sz_permil_show(struct kobject *kobj,
1047 struct kobj_attribute *attr, char *buf)
1049 struct damon_sysfs_weights *weights = container_of(kobj,
1050 struct damon_sysfs_weights, kobj);
1052 return sysfs_emit(buf, "%u\n", weights->sz);
1055 static ssize_t sz_permil_store(struct kobject *kobj,
1056 struct kobj_attribute *attr, const char *buf, size_t count)
1058 struct damon_sysfs_weights *weights = container_of(kobj,
1059 struct damon_sysfs_weights, kobj);
1060 int err = kstrtouint(buf, 0, &weights->sz);
1062 return err ? err : count;
1065 static ssize_t nr_accesses_permil_show(struct kobject *kobj,
1066 struct kobj_attribute *attr, char *buf)
1068 struct damon_sysfs_weights *weights = container_of(kobj,
1069 struct damon_sysfs_weights, kobj);
1071 return sysfs_emit(buf, "%u\n", weights->nr_accesses);
1074 static ssize_t nr_accesses_permil_store(struct kobject *kobj,
1075 struct kobj_attribute *attr, const char *buf, size_t count)
1077 struct damon_sysfs_weights *weights = container_of(kobj,
1078 struct damon_sysfs_weights, kobj);
1079 int err = kstrtouint(buf, 0, &weights->nr_accesses);
1081 return err ? err : count;
1084 static ssize_t age_permil_show(struct kobject *kobj,
1085 struct kobj_attribute *attr, char *buf)
1087 struct damon_sysfs_weights *weights = container_of(kobj,
1088 struct damon_sysfs_weights, kobj);
1090 return sysfs_emit(buf, "%u\n", weights->age);
1093 static ssize_t age_permil_store(struct kobject *kobj,
1094 struct kobj_attribute *attr, const char *buf, size_t count)
1096 struct damon_sysfs_weights *weights = container_of(kobj,
1097 struct damon_sysfs_weights, kobj);
1098 int err = kstrtouint(buf, 0, &weights->age);
1100 return err ? err : count;
1103 static void damon_sysfs_weights_release(struct kobject *kobj)
1105 kfree(container_of(kobj, struct damon_sysfs_weights, kobj));
1108 static struct kobj_attribute damon_sysfs_weights_sz_attr =
1109 __ATTR_RW_MODE(sz_permil, 0600);
1111 static struct kobj_attribute damon_sysfs_weights_nr_accesses_attr =
1112 __ATTR_RW_MODE(nr_accesses_permil, 0600);
1114 static struct kobj_attribute damon_sysfs_weights_age_attr =
1115 __ATTR_RW_MODE(age_permil, 0600);
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,
1123 ATTRIBUTE_GROUPS(damon_sysfs_weights);
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,
1135 struct damon_sysfs_quotas {
1136 struct kobject kobj;
1137 struct damon_sysfs_weights *weights;
1138 struct damos_sysfs_quota_goals *goals;
1141 unsigned long reset_interval_ms;
1144 static struct damon_sysfs_quotas *damon_sysfs_quotas_alloc(void)
1146 return kzalloc(sizeof(struct damon_sysfs_quotas), GFP_KERNEL);
1149 static int damon_sysfs_quotas_add_dirs(struct damon_sysfs_quotas *quotas)
1151 struct damon_sysfs_weights *weights;
1152 struct damos_sysfs_quota_goals *goals;
1155 weights = damon_sysfs_weights_alloc(0, 0, 0);
1159 err = kobject_init_and_add(&weights->kobj, &damon_sysfs_weights_ktype,
1160 "as->kobj, "weights");
1162 kobject_put(&weights->kobj);
1165 quotas->weights = weights;
1167 goals = damos_sysfs_quota_goals_alloc();
1169 kobject_put(&weights->kobj);
1172 err = kobject_init_and_add(&goals->kobj,
1173 &damos_sysfs_quota_goals_ktype, "as->kobj,
1176 kobject_put(&weights->kobj);
1177 kobject_put(&goals->kobj);
1179 quotas->goals = goals;
1185 static void damon_sysfs_quotas_rm_dirs(struct damon_sysfs_quotas *quotas)
1187 kobject_put("as->weights->kobj);
1188 damos_sysfs_quota_goals_rm_dirs(quotas->goals);
1189 kobject_put("as->goals->kobj);
1192 static ssize_t ms_show(struct kobject *kobj, struct kobj_attribute *attr,
1195 struct damon_sysfs_quotas *quotas = container_of(kobj,
1196 struct damon_sysfs_quotas, kobj);
1198 return sysfs_emit(buf, "%lu\n", quotas->ms);
1201 static ssize_t ms_store(struct kobject *kobj, struct kobj_attribute *attr,
1202 const char *buf, size_t count)
1204 struct damon_sysfs_quotas *quotas = container_of(kobj,
1205 struct damon_sysfs_quotas, kobj);
1206 int err = kstrtoul(buf, 0, "as->ms);
1213 static ssize_t bytes_show(struct kobject *kobj, struct kobj_attribute *attr,
1216 struct damon_sysfs_quotas *quotas = container_of(kobj,
1217 struct damon_sysfs_quotas, kobj);
1219 return sysfs_emit(buf, "%lu\n", quotas->sz);
1222 static ssize_t bytes_store(struct kobject *kobj,
1223 struct kobj_attribute *attr, const char *buf, size_t count)
1225 struct damon_sysfs_quotas *quotas = container_of(kobj,
1226 struct damon_sysfs_quotas, kobj);
1227 int err = kstrtoul(buf, 0, "as->sz);
1234 static ssize_t reset_interval_ms_show(struct kobject *kobj,
1235 struct kobj_attribute *attr, char *buf)
1237 struct damon_sysfs_quotas *quotas = container_of(kobj,
1238 struct damon_sysfs_quotas, kobj);
1240 return sysfs_emit(buf, "%lu\n", quotas->reset_interval_ms);
1243 static ssize_t reset_interval_ms_store(struct kobject *kobj,
1244 struct kobj_attribute *attr, const char *buf, size_t count)
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);
1255 static void damon_sysfs_quotas_release(struct kobject *kobj)
1257 kfree(container_of(kobj, struct damon_sysfs_quotas, kobj));
1260 static struct kobj_attribute damon_sysfs_quotas_ms_attr =
1261 __ATTR_RW_MODE(ms, 0600);
1263 static struct kobj_attribute damon_sysfs_quotas_sz_attr =
1264 __ATTR_RW_MODE(bytes, 0600);
1266 static struct kobj_attribute damon_sysfs_quotas_reset_interval_ms_attr =
1267 __ATTR_RW_MODE(reset_interval_ms, 0600);
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,
1275 ATTRIBUTE_GROUPS(damon_sysfs_quotas);
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,
1284 * access_pattern directory
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;
1295 struct damon_sysfs_access_pattern *damon_sysfs_access_pattern_alloc(void)
1297 struct damon_sysfs_access_pattern *access_pattern =
1298 kmalloc(sizeof(*access_pattern), GFP_KERNEL);
1300 if (!access_pattern)
1302 access_pattern->kobj = (struct kobject){};
1303 return access_pattern;
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,
1311 struct damon_sysfs_ul_range *range = damon_sysfs_ul_range_alloc(0, 0);
1316 err = kobject_init_and_add(&range->kobj, &damon_sysfs_ul_range_ktype,
1317 &access_pattern->kobj, name);
1319 kobject_put(&range->kobj);
1321 *range_dir_ptr = range;
1325 static int damon_sysfs_access_pattern_add_dirs(
1326 struct damon_sysfs_access_pattern *access_pattern)
1330 err = damon_sysfs_access_pattern_add_range_dir(access_pattern,
1331 &access_pattern->sz, "sz");
1335 err = damon_sysfs_access_pattern_add_range_dir(access_pattern,
1336 &access_pattern->nr_accesses, "nr_accesses");
1338 goto put_nr_accesses_sz_out;
1340 err = damon_sysfs_access_pattern_add_range_dir(access_pattern,
1341 &access_pattern->age, "age");
1343 goto put_age_nr_accesses_sz_out;
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;
1353 kobject_put(&access_pattern->sz->kobj);
1354 access_pattern->sz = NULL;
1358 static void damon_sysfs_access_pattern_rm_dirs(
1359 struct damon_sysfs_access_pattern *access_pattern)
1361 kobject_put(&access_pattern->sz->kobj);
1362 kobject_put(&access_pattern->nr_accesses->kobj);
1363 kobject_put(&access_pattern->age->kobj);
1366 static void damon_sysfs_access_pattern_release(struct kobject *kobj)
1368 kfree(container_of(kobj, struct damon_sysfs_access_pattern, kobj));
1371 static struct attribute *damon_sysfs_access_pattern_attrs[] = {
1374 ATTRIBUTE_GROUPS(damon_sysfs_access_pattern);
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,
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;
1398 /* This should match with enum damos_action */
1399 static const char * const damon_sysfs_damos_action_strs[] = {
1410 static struct damon_sysfs_scheme *damon_sysfs_scheme_alloc(
1411 enum damos_action action, unsigned long apply_interval_us)
1413 struct damon_sysfs_scheme *scheme = kmalloc(sizeof(*scheme),
1418 scheme->kobj = (struct kobject){};
1419 scheme->action = action;
1420 scheme->apply_interval_us = apply_interval_us;
1424 static int damon_sysfs_scheme_set_access_pattern(
1425 struct damon_sysfs_scheme *scheme)
1427 struct damon_sysfs_access_pattern *access_pattern;
1430 access_pattern = damon_sysfs_access_pattern_alloc();
1431 if (!access_pattern)
1433 err = kobject_init_and_add(&access_pattern->kobj,
1434 &damon_sysfs_access_pattern_ktype, &scheme->kobj,
1438 err = damon_sysfs_access_pattern_add_dirs(access_pattern);
1441 scheme->access_pattern = access_pattern;
1445 kobject_put(&access_pattern->kobj);
1449 static int damon_sysfs_scheme_set_quotas(struct damon_sysfs_scheme *scheme)
1451 struct damon_sysfs_quotas *quotas = damon_sysfs_quotas_alloc();
1456 err = kobject_init_and_add("as->kobj, &damon_sysfs_quotas_ktype,
1457 &scheme->kobj, "quotas");
1460 err = damon_sysfs_quotas_add_dirs(quotas);
1463 scheme->quotas = quotas;
1467 kobject_put("as->kobj);
1471 static int damon_sysfs_scheme_set_watermarks(struct damon_sysfs_scheme *scheme)
1473 struct damon_sysfs_watermarks *watermarks =
1474 damon_sysfs_watermarks_alloc(DAMOS_WMARK_NONE, 0, 0, 0, 0);
1479 err = kobject_init_and_add(&watermarks->kobj,
1480 &damon_sysfs_watermarks_ktype, &scheme->kobj,
1483 kobject_put(&watermarks->kobj);
1485 scheme->watermarks = watermarks;
1489 static int damon_sysfs_scheme_set_filters(struct damon_sysfs_scheme *scheme)
1491 struct damon_sysfs_scheme_filters *filters =
1492 damon_sysfs_scheme_filters_alloc();
1497 err = kobject_init_and_add(&filters->kobj,
1498 &damon_sysfs_scheme_filters_ktype, &scheme->kobj,
1501 kobject_put(&filters->kobj);
1503 scheme->filters = filters;
1507 static int damon_sysfs_scheme_set_stats(struct damon_sysfs_scheme *scheme)
1509 struct damon_sysfs_stats *stats = damon_sysfs_stats_alloc();
1514 err = kobject_init_and_add(&stats->kobj, &damon_sysfs_stats_ktype,
1515 &scheme->kobj, "stats");
1517 kobject_put(&stats->kobj);
1519 scheme->stats = stats;
1523 static int damon_sysfs_scheme_set_tried_regions(
1524 struct damon_sysfs_scheme *scheme)
1526 struct damon_sysfs_scheme_regions *tried_regions =
1527 damon_sysfs_scheme_regions_alloc();
1532 err = kobject_init_and_add(&tried_regions->kobj,
1533 &damon_sysfs_scheme_regions_ktype, &scheme->kobj,
1536 kobject_put(&tried_regions->kobj);
1538 scheme->tried_regions = tried_regions;
1542 static int damon_sysfs_scheme_add_dirs(struct damon_sysfs_scheme *scheme)
1546 err = damon_sysfs_scheme_set_access_pattern(scheme);
1549 err = damon_sysfs_scheme_set_quotas(scheme);
1551 goto put_access_pattern_out;
1552 err = damon_sysfs_scheme_set_watermarks(scheme);
1554 goto put_quotas_access_pattern_out;
1555 err = damon_sysfs_scheme_set_filters(scheme);
1557 goto put_watermarks_quotas_access_pattern_out;
1558 err = damon_sysfs_scheme_set_stats(scheme);
1560 goto put_filters_watermarks_quotas_access_pattern_out;
1561 err = damon_sysfs_scheme_set_tried_regions(scheme);
1563 goto put_tried_regions_out;
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;
1584 static void damon_sysfs_scheme_rm_dirs(struct damon_sysfs_scheme *scheme)
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);
1598 static ssize_t action_show(struct kobject *kobj, struct kobj_attribute *attr,
1601 struct damon_sysfs_scheme *scheme = container_of(kobj,
1602 struct damon_sysfs_scheme, kobj);
1604 return sysfs_emit(buf, "%s\n",
1605 damon_sysfs_damos_action_strs[scheme->action]);
1608 static ssize_t action_store(struct kobject *kobj, struct kobj_attribute *attr,
1609 const char *buf, size_t count)
1611 struct damon_sysfs_scheme *scheme = container_of(kobj,
1612 struct damon_sysfs_scheme, kobj);
1613 enum damos_action action;
1615 for (action = 0; action < NR_DAMOS_ACTIONS; action++) {
1616 if (sysfs_streq(buf, damon_sysfs_damos_action_strs[action])) {
1617 scheme->action = action;
1624 static ssize_t apply_interval_us_show(struct kobject *kobj,
1625 struct kobj_attribute *attr, char *buf)
1627 struct damon_sysfs_scheme *scheme = container_of(kobj,
1628 struct damon_sysfs_scheme, kobj);
1630 return sysfs_emit(buf, "%lu\n", scheme->apply_interval_us);
1633 static ssize_t apply_interval_us_store(struct kobject *kobj,
1634 struct kobj_attribute *attr, const char *buf, size_t count)
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);
1640 return err ? err : count;
1643 static void damon_sysfs_scheme_release(struct kobject *kobj)
1645 kfree(container_of(kobj, struct damon_sysfs_scheme, kobj));
1648 static struct kobj_attribute damon_sysfs_scheme_action_attr =
1649 __ATTR_RW_MODE(action, 0600);
1651 static struct kobj_attribute damon_sysfs_scheme_apply_interval_us_attr =
1652 __ATTR_RW_MODE(apply_interval_us, 0600);
1654 static struct attribute *damon_sysfs_scheme_attrs[] = {
1655 &damon_sysfs_scheme_action_attr.attr,
1656 &damon_sysfs_scheme_apply_interval_us_attr.attr,
1659 ATTRIBUTE_GROUPS(damon_sysfs_scheme);
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,
1671 struct damon_sysfs_schemes *damon_sysfs_schemes_alloc(void)
1673 return kzalloc(sizeof(struct damon_sysfs_schemes), GFP_KERNEL);
1676 void damon_sysfs_schemes_rm_dirs(struct damon_sysfs_schemes *schemes)
1678 struct damon_sysfs_scheme **schemes_arr = schemes->schemes_arr;
1681 for (i = 0; i < schemes->nr; i++) {
1682 damon_sysfs_scheme_rm_dirs(schemes_arr[i]);
1683 kobject_put(&schemes_arr[i]->kobj);
1687 schemes->schemes_arr = NULL;
1690 static int damon_sysfs_schemes_add_dirs(struct damon_sysfs_schemes *schemes,
1693 struct damon_sysfs_scheme **schemes_arr, *scheme;
1696 damon_sysfs_schemes_rm_dirs(schemes);
1700 schemes_arr = kmalloc_array(nr_schemes, sizeof(*schemes_arr),
1701 GFP_KERNEL | __GFP_NOWARN);
1704 schemes->schemes_arr = schemes_arr;
1706 for (i = 0; i < nr_schemes; i++) {
1708 * apply_interval_us as 0 means same to aggregation interval
1709 * (same to before-apply_interval behavior)
1711 scheme = damon_sysfs_scheme_alloc(DAMOS_STAT, 0);
1713 damon_sysfs_schemes_rm_dirs(schemes);
1717 err = kobject_init_and_add(&scheme->kobj,
1718 &damon_sysfs_scheme_ktype, &schemes->kobj,
1722 err = damon_sysfs_scheme_add_dirs(scheme);
1726 schemes_arr[i] = scheme;
1732 damon_sysfs_schemes_rm_dirs(schemes);
1733 kobject_put(&scheme->kobj);
1737 static ssize_t nr_schemes_show(struct kobject *kobj,
1738 struct kobj_attribute *attr, char *buf)
1740 struct damon_sysfs_schemes *schemes = container_of(kobj,
1741 struct damon_sysfs_schemes, kobj);
1743 return sysfs_emit(buf, "%d\n", schemes->nr);
1746 static ssize_t nr_schemes_store(struct kobject *kobj,
1747 struct kobj_attribute *attr, const char *buf, size_t count)
1749 struct damon_sysfs_schemes *schemes;
1750 int nr, err = kstrtoint(buf, 0, &nr);
1757 schemes = container_of(kobj, struct damon_sysfs_schemes, kobj);
1759 if (!mutex_trylock(&damon_sysfs_lock))
1761 err = damon_sysfs_schemes_add_dirs(schemes, nr);
1762 mutex_unlock(&damon_sysfs_lock);
1768 static void damon_sysfs_schemes_release(struct kobject *kobj)
1770 kfree(container_of(kobj, struct damon_sysfs_schemes, kobj));
1773 static struct kobj_attribute damon_sysfs_schemes_nr_attr =
1774 __ATTR_RW_MODE(nr_schemes, 0600);
1776 static struct attribute *damon_sysfs_schemes_attrs[] = {
1777 &damon_sysfs_schemes_nr_attr.attr,
1780 ATTRIBUTE_GROUPS(damon_sysfs_schemes);
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,
1788 static bool damon_sysfs_memcg_path_eq(struct mem_cgroup *memcg,
1789 char *memcg_path_buf, char *path)
1792 cgroup_path(memcg->css.cgroup, memcg_path_buf, PATH_MAX);
1793 if (sysfs_streq(memcg_path_buf, path))
1795 #endif /* CONFIG_MEMCG */
1799 static int damon_sysfs_memcg_path_to_id(char *memcg_path, unsigned short *id)
1801 struct mem_cgroup *memcg;
1808 path = kmalloc(sizeof(*path) * PATH_MAX, GFP_KERNEL);
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))
1817 if (damon_sysfs_memcg_path_eq(memcg, path, memcg_path)) {
1818 *id = mem_cgroup_id(memcg);
1825 return found ? 0 : -EINVAL;
1828 static int damon_sysfs_set_scheme_filters(struct damos *scheme,
1829 struct damon_sysfs_scheme_filters *sysfs_filters)
1832 struct damos_filter *filter, *next;
1834 damos_for_each_filter_safe(filter, next, scheme)
1835 damos_destroy_filter(filter);
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);
1847 if (filter->type == DAMOS_FILTER_TYPE_MEMCG) {
1848 err = damon_sysfs_memcg_path_to_id(
1849 sysfs_filter->memcg_path,
1852 damos_destroy_filter(filter);
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);
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;
1866 damos_add_filter(scheme, filter);
1871 static unsigned long damos_sysfs_get_quota_score(void *arg)
1873 return (unsigned long)arg;
1876 static void damos_sysfs_set_quota_score(
1877 struct damos_sysfs_quota_goals *sysfs_goals,
1878 struct damos_quota *quota)
1880 struct damos_sysfs_quota_goal *sysfs_goal;
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)
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;
1899 void damos_sysfs_set_quota_scores(struct damon_sysfs_schemes *sysfs_schemes,
1900 struct damon_ctx *ctx)
1902 struct damos *scheme;
1905 damon_for_each_scheme(scheme, ctx) {
1906 struct damon_sysfs_scheme *sysfs_scheme;
1908 sysfs_scheme = sysfs_schemes->schemes_arr[i];
1909 damos_sysfs_set_quota_score(sysfs_scheme->quotas->goals,
1915 static struct damos *damon_sysfs_mk_scheme(
1916 struct damon_sysfs_scheme *sysfs_scheme)
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;
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,
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,
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,
1952 damos_sysfs_set_quota_score(sysfs_quotas->goals, "a);
1954 scheme = damon_new_scheme(&pattern, sysfs_scheme->action,
1955 sysfs_scheme->apply_interval_us, "a, &wmarks);
1959 err = damon_sysfs_set_scheme_filters(scheme, sysfs_filters);
1961 damon_destroy_scheme(scheme);
1967 static void damon_sysfs_update_scheme(struct damos *scheme,
1968 struct damon_sysfs_scheme *sysfs_scheme)
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;
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;
1984 scheme->action = sysfs_scheme->action;
1985 scheme->apply_interval_us = sysfs_scheme->apply_interval_us;
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;
1994 damos_sysfs_set_quota_score(sysfs_quotas->goals, &scheme->quota);
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;
2002 err = damon_sysfs_set_scheme_filters(scheme, sysfs_scheme->filters);
2004 damon_destroy_scheme(scheme);
2007 int damon_sysfs_set_schemes(struct damon_ctx *ctx,
2008 struct damon_sysfs_schemes *sysfs_schemes)
2010 struct damos *scheme, *next;
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]);
2018 damon_destroy_scheme(scheme);
2022 for (; i < sysfs_schemes->nr; i++) {
2023 struct damos *scheme, *next;
2025 scheme = damon_sysfs_mk_scheme(sysfs_schemes->schemes_arr[i]);
2027 damon_for_each_scheme_safe(scheme, next, ctx)
2028 damon_destroy_scheme(scheme);
2031 damon_add_scheme(ctx, scheme);
2036 void damon_sysfs_schemes_update_stats(
2037 struct damon_sysfs_schemes *sysfs_schemes,
2038 struct damon_ctx *ctx)
2040 struct damos *scheme;
2041 int schemes_idx = 0;
2043 damon_for_each_scheme(scheme, ctx) {
2044 struct damon_sysfs_stats *sysfs_stats;
2046 /* user could have removed the scheme sysfs dir */
2047 if (schemes_idx >= sysfs_schemes->nr)
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;
2060 * damon_sysfs_schemes that need to update its schemes regions dir. Protected
2061 * by damon_sysfs_lock
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;
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.
2072 static int damon_sysfs_before_damos_apply(struct damon_ctx *ctx,
2073 struct damon_target *t, struct damon_region *r,
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;
2083 damon_for_each_scheme(scheme, ctx) {
2089 /* user could have removed the scheme sysfs dir */
2090 if (schemes_idx >= sysfs_schemes->nr)
2093 sysfs_regions = sysfs_schemes->schemes_arr[schemes_idx]->tried_regions;
2094 if (sysfs_regions->upd_status == DAMOS_TRIED_REGIONS_UPD_FINISHED)
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)
2102 region = damon_sysfs_scheme_region_alloc(r);
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);
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.
2121 static int damon_sysfs_after_sampling(struct damon_ctx *ctx)
2123 struct damon_sysfs_schemes *sysfs_schemes =
2124 damon_sysfs_schemes_for_damos_callback;
2125 struct damon_sysfs_scheme_regions *sysfs_regions;
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 ||
2133 sysfs_regions->upd_timeout_jiffies))
2134 sysfs_regions->upd_status =
2135 DAMOS_TRIED_REGIONS_UPD_FINISHED;
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)
2146 struct damos *scheme;
2147 int schemes_idx = 0;
2149 damon_for_each_scheme(scheme, ctx) {
2150 struct damon_sysfs_scheme *sysfs_scheme;
2152 /* user could have removed the scheme sysfs dir */
2153 if (schemes_idx >= sysfs_schemes->nr)
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;
2164 static struct damos *damos_sysfs_nth_scheme(int n, struct damon_ctx *ctx)
2166 struct damos *scheme;
2169 damon_for_each_scheme(scheme, ctx) {
2177 static void damos_tried_regions_init_upd_status(
2178 struct damon_sysfs_schemes *sysfs_schemes,
2179 struct damon_ctx *ctx)
2182 struct damos *scheme;
2183 struct damon_sysfs_scheme_regions *sysfs_regions;
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);
2189 sysfs_regions->upd_status =
2190 DAMOS_TRIED_REGIONS_UPD_FINISHED;
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);
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)
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;
2215 bool damos_sysfs_regions_upd_done(void)
2217 struct damon_sysfs_schemes *sysfs_schemes =
2218 damon_sysfs_schemes_for_damos_callback;
2219 struct damon_sysfs_scheme_regions *sysfs_regions;
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)
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()
2236 int damon_sysfs_schemes_update_regions_stop(struct damon_ctx *ctx)
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;