// SPDX-License-Identifier: GPL-2.0 /* * DAMON sysfs Interface * * Copyright (c) 2022 SeongJae Park */ #include #include "sysfs-common.h" /* * scheme region directory */ struct damon_sysfs_scheme_region { struct kobject kobj; struct damon_addr_range ar; unsigned int nr_accesses; unsigned int age; struct list_head list; }; static struct damon_sysfs_scheme_region *damon_sysfs_scheme_region_alloc( struct damon_region *region) { struct damon_sysfs_scheme_region *sysfs_region = kmalloc( sizeof(*sysfs_region), GFP_KERNEL); if (!sysfs_region) return NULL; sysfs_region->kobj = (struct kobject){}; sysfs_region->ar = region->ar; sysfs_region->nr_accesses = region->nr_accesses; sysfs_region->age = region->age; INIT_LIST_HEAD(&sysfs_region->list); return sysfs_region; } static ssize_t start_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_scheme_region *region = container_of(kobj, struct damon_sysfs_scheme_region, kobj); return sysfs_emit(buf, "%lu\n", region->ar.start); } static ssize_t end_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_scheme_region *region = container_of(kobj, struct damon_sysfs_scheme_region, kobj); return sysfs_emit(buf, "%lu\n", region->ar.end); } static ssize_t nr_accesses_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_scheme_region *region = container_of(kobj, struct damon_sysfs_scheme_region, kobj); return sysfs_emit(buf, "%u\n", region->nr_accesses); } static ssize_t age_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_scheme_region *region = container_of(kobj, struct damon_sysfs_scheme_region, kobj); return sysfs_emit(buf, "%u\n", region->age); } static void damon_sysfs_scheme_region_release(struct kobject *kobj) { struct damon_sysfs_scheme_region *region = container_of(kobj, struct damon_sysfs_scheme_region, kobj); list_del(®ion->list); kfree(region); } static struct kobj_attribute damon_sysfs_scheme_region_start_attr = __ATTR_RO_MODE(start, 0400); static struct kobj_attribute damon_sysfs_scheme_region_end_attr = __ATTR_RO_MODE(end, 0400); static struct kobj_attribute damon_sysfs_scheme_region_nr_accesses_attr = __ATTR_RO_MODE(nr_accesses, 0400); static struct kobj_attribute damon_sysfs_scheme_region_age_attr = __ATTR_RO_MODE(age, 0400); static struct attribute *damon_sysfs_scheme_region_attrs[] = { &damon_sysfs_scheme_region_start_attr.attr, &damon_sysfs_scheme_region_end_attr.attr, &damon_sysfs_scheme_region_nr_accesses_attr.attr, &damon_sysfs_scheme_region_age_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_scheme_region); static const struct kobj_type damon_sysfs_scheme_region_ktype = { .release = damon_sysfs_scheme_region_release, .sysfs_ops = &kobj_sysfs_ops, .default_groups = damon_sysfs_scheme_region_groups, }; /* * scheme regions directory */ struct damon_sysfs_scheme_regions { struct kobject kobj; struct list_head regions_list; int nr_regions; unsigned long total_bytes; }; static struct damon_sysfs_scheme_regions * damon_sysfs_scheme_regions_alloc(void) { struct damon_sysfs_scheme_regions *regions = kmalloc(sizeof(*regions), GFP_KERNEL); if (!regions) return NULL; regions->kobj = (struct kobject){}; INIT_LIST_HEAD(®ions->regions_list); regions->nr_regions = 0; regions->total_bytes = 0; return regions; } static ssize_t total_bytes_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_scheme_regions *regions = container_of(kobj, struct damon_sysfs_scheme_regions, kobj); return sysfs_emit(buf, "%lu\n", regions->total_bytes); } static void damon_sysfs_scheme_regions_rm_dirs( struct damon_sysfs_scheme_regions *regions) { struct damon_sysfs_scheme_region *r, *next; list_for_each_entry_safe(r, next, ®ions->regions_list, list) { /* release function deletes it from the list */ kobject_put(&r->kobj); regions->nr_regions--; } } static void damon_sysfs_scheme_regions_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_scheme_regions, kobj)); } static struct kobj_attribute damon_sysfs_scheme_regions_total_bytes_attr = __ATTR_RO_MODE(total_bytes, 0400); static struct attribute *damon_sysfs_scheme_regions_attrs[] = { &damon_sysfs_scheme_regions_total_bytes_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_scheme_regions); static const struct kobj_type damon_sysfs_scheme_regions_ktype = { .release = damon_sysfs_scheme_regions_release, .sysfs_ops = &kobj_sysfs_ops, .default_groups = damon_sysfs_scheme_regions_groups, }; /* * schemes/stats directory */ struct damon_sysfs_stats { struct kobject kobj; unsigned long nr_tried; unsigned long sz_tried; unsigned long nr_applied; unsigned long sz_applied; unsigned long qt_exceeds; }; static struct damon_sysfs_stats *damon_sysfs_stats_alloc(void) { return kzalloc(sizeof(struct damon_sysfs_stats), GFP_KERNEL); } static ssize_t nr_tried_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_stats *stats = container_of(kobj, struct damon_sysfs_stats, kobj); return sysfs_emit(buf, "%lu\n", stats->nr_tried); } static ssize_t sz_tried_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_stats *stats = container_of(kobj, struct damon_sysfs_stats, kobj); return sysfs_emit(buf, "%lu\n", stats->sz_tried); } static ssize_t nr_applied_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_stats *stats = container_of(kobj, struct damon_sysfs_stats, kobj); return sysfs_emit(buf, "%lu\n", stats->nr_applied); } static ssize_t sz_applied_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_stats *stats = container_of(kobj, struct damon_sysfs_stats, kobj); return sysfs_emit(buf, "%lu\n", stats->sz_applied); } static ssize_t qt_exceeds_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_stats *stats = container_of(kobj, struct damon_sysfs_stats, kobj); return sysfs_emit(buf, "%lu\n", stats->qt_exceeds); } static void damon_sysfs_stats_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_stats, kobj)); } static struct kobj_attribute damon_sysfs_stats_nr_tried_attr = __ATTR_RO_MODE(nr_tried, 0400); static struct kobj_attribute damon_sysfs_stats_sz_tried_attr = __ATTR_RO_MODE(sz_tried, 0400); static struct kobj_attribute damon_sysfs_stats_nr_applied_attr = __ATTR_RO_MODE(nr_applied, 0400); static struct kobj_attribute damon_sysfs_stats_sz_applied_attr = __ATTR_RO_MODE(sz_applied, 0400); static struct kobj_attribute damon_sysfs_stats_qt_exceeds_attr = __ATTR_RO_MODE(qt_exceeds, 0400); static struct attribute *damon_sysfs_stats_attrs[] = { &damon_sysfs_stats_nr_tried_attr.attr, &damon_sysfs_stats_sz_tried_attr.attr, &damon_sysfs_stats_nr_applied_attr.attr, &damon_sysfs_stats_sz_applied_attr.attr, &damon_sysfs_stats_qt_exceeds_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_stats); static const struct kobj_type damon_sysfs_stats_ktype = { .release = damon_sysfs_stats_release, .sysfs_ops = &kobj_sysfs_ops, .default_groups = damon_sysfs_stats_groups, }; /* * filter directory */ struct damon_sysfs_scheme_filter { struct kobject kobj; enum damos_filter_type type; bool matching; char *memcg_path; struct damon_addr_range addr_range; int target_idx; }; static struct damon_sysfs_scheme_filter *damon_sysfs_scheme_filter_alloc(void) { return kzalloc(sizeof(struct damon_sysfs_scheme_filter), GFP_KERNEL); } /* Should match with enum damos_filter_type */ static const char * const damon_sysfs_scheme_filter_type_strs[] = { "anon", "memcg", "addr", "target", }; static ssize_t type_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_scheme_filter *filter = container_of(kobj, struct damon_sysfs_scheme_filter, kobj); return sysfs_emit(buf, "%s\n", damon_sysfs_scheme_filter_type_strs[filter->type]); } static ssize_t type_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_scheme_filter *filter = container_of(kobj, struct damon_sysfs_scheme_filter, kobj); enum damos_filter_type type; ssize_t ret = -EINVAL; for (type = 0; type < NR_DAMOS_FILTER_TYPES; type++) { if (sysfs_streq(buf, damon_sysfs_scheme_filter_type_strs[ type])) { filter->type = type; ret = count; break; } } return ret; } static ssize_t matching_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_scheme_filter *filter = container_of(kobj, struct damon_sysfs_scheme_filter, kobj); return sysfs_emit(buf, "%c\n", filter->matching ? 'Y' : 'N'); } static ssize_t matching_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_scheme_filter *filter = container_of(kobj, struct damon_sysfs_scheme_filter, kobj); bool matching; int err = kstrtobool(buf, &matching); if (err) return err; filter->matching = matching; return count; } static ssize_t memcg_path_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_scheme_filter *filter = container_of(kobj, struct damon_sysfs_scheme_filter, kobj); return sysfs_emit(buf, "%s\n", filter->memcg_path ? filter->memcg_path : ""); } static ssize_t memcg_path_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_scheme_filter *filter = container_of(kobj, struct damon_sysfs_scheme_filter, kobj); char *path = kmalloc(sizeof(*path) * (count + 1), GFP_KERNEL); if (!path) return -ENOMEM; strscpy(path, buf, count + 1); filter->memcg_path = path; return count; } static ssize_t addr_start_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_scheme_filter *filter = container_of(kobj, struct damon_sysfs_scheme_filter, kobj); return sysfs_emit(buf, "%lu\n", filter->addr_range.start); } static ssize_t addr_start_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_scheme_filter *filter = container_of(kobj, struct damon_sysfs_scheme_filter, kobj); int err = kstrtoul(buf, 0, &filter->addr_range.start); return err ? err : count; } static ssize_t addr_end_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_scheme_filter *filter = container_of(kobj, struct damon_sysfs_scheme_filter, kobj); return sysfs_emit(buf, "%lu\n", filter->addr_range.end); } static ssize_t addr_end_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_scheme_filter *filter = container_of(kobj, struct damon_sysfs_scheme_filter, kobj); int err = kstrtoul(buf, 0, &filter->addr_range.end); return err ? err : count; } static ssize_t damon_target_idx_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_scheme_filter *filter = container_of(kobj, struct damon_sysfs_scheme_filter, kobj); return sysfs_emit(buf, "%d\n", filter->target_idx); } static ssize_t damon_target_idx_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_scheme_filter *filter = container_of(kobj, struct damon_sysfs_scheme_filter, kobj); int err = kstrtoint(buf, 0, &filter->target_idx); return err ? err : count; } static void damon_sysfs_scheme_filter_release(struct kobject *kobj) { struct damon_sysfs_scheme_filter *filter = container_of(kobj, struct damon_sysfs_scheme_filter, kobj); kfree(filter->memcg_path); kfree(filter); } static struct kobj_attribute damon_sysfs_scheme_filter_type_attr = __ATTR_RW_MODE(type, 0600); static struct kobj_attribute damon_sysfs_scheme_filter_matching_attr = __ATTR_RW_MODE(matching, 0600); static struct kobj_attribute damon_sysfs_scheme_filter_memcg_path_attr = __ATTR_RW_MODE(memcg_path, 0600); static struct kobj_attribute damon_sysfs_scheme_filter_addr_start_attr = __ATTR_RW_MODE(addr_start, 0600); static struct kobj_attribute damon_sysfs_scheme_filter_addr_end_attr = __ATTR_RW_MODE(addr_end, 0600); static struct kobj_attribute damon_sysfs_scheme_filter_damon_target_idx_attr = __ATTR_RW_MODE(damon_target_idx, 0600); static struct attribute *damon_sysfs_scheme_filter_attrs[] = { &damon_sysfs_scheme_filter_type_attr.attr, &damon_sysfs_scheme_filter_matching_attr.attr, &damon_sysfs_scheme_filter_memcg_path_attr.attr, &damon_sysfs_scheme_filter_addr_start_attr.attr, &damon_sysfs_scheme_filter_addr_end_attr.attr, &damon_sysfs_scheme_filter_damon_target_idx_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_scheme_filter); static const struct kobj_type damon_sysfs_scheme_filter_ktype = { .release = damon_sysfs_scheme_filter_release, .sysfs_ops = &kobj_sysfs_ops, .default_groups = damon_sysfs_scheme_filter_groups, }; /* * filters directory */ struct damon_sysfs_scheme_filters { struct kobject kobj; struct damon_sysfs_scheme_filter **filters_arr; int nr; }; static struct damon_sysfs_scheme_filters * damon_sysfs_scheme_filters_alloc(void) { return kzalloc(sizeof(struct damon_sysfs_scheme_filters), GFP_KERNEL); } static void damon_sysfs_scheme_filters_rm_dirs( struct damon_sysfs_scheme_filters *filters) { struct damon_sysfs_scheme_filter **filters_arr = filters->filters_arr; int i; for (i = 0; i < filters->nr; i++) kobject_put(&filters_arr[i]->kobj); filters->nr = 0; kfree(filters_arr); filters->filters_arr = NULL; } static int damon_sysfs_scheme_filters_add_dirs( struct damon_sysfs_scheme_filters *filters, int nr_filters) { struct damon_sysfs_scheme_filter **filters_arr, *filter; int err, i; damon_sysfs_scheme_filters_rm_dirs(filters); if (!nr_filters) return 0; filters_arr = kmalloc_array(nr_filters, sizeof(*filters_arr), GFP_KERNEL | __GFP_NOWARN); if (!filters_arr) return -ENOMEM; filters->filters_arr = filters_arr; for (i = 0; i < nr_filters; i++) { filter = damon_sysfs_scheme_filter_alloc(); if (!filter) { damon_sysfs_scheme_filters_rm_dirs(filters); return -ENOMEM; } err = kobject_init_and_add(&filter->kobj, &damon_sysfs_scheme_filter_ktype, &filters->kobj, "%d", i); if (err) { kobject_put(&filter->kobj); damon_sysfs_scheme_filters_rm_dirs(filters); return err; } filters_arr[i] = filter; filters->nr++; } return 0; } static ssize_t nr_filters_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_scheme_filters *filters = container_of(kobj, struct damon_sysfs_scheme_filters, kobj); return sysfs_emit(buf, "%d\n", filters->nr); } static ssize_t nr_filters_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_scheme_filters *filters; int nr, err = kstrtoint(buf, 0, &nr); if (err) return err; if (nr < 0) return -EINVAL; filters = container_of(kobj, struct damon_sysfs_scheme_filters, kobj); if (!mutex_trylock(&damon_sysfs_lock)) return -EBUSY; err = damon_sysfs_scheme_filters_add_dirs(filters, nr); mutex_unlock(&damon_sysfs_lock); if (err) return err; return count; } static void damon_sysfs_scheme_filters_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_scheme_filters, kobj)); } static struct kobj_attribute damon_sysfs_scheme_filters_nr_attr = __ATTR_RW_MODE(nr_filters, 0600); static struct attribute *damon_sysfs_scheme_filters_attrs[] = { &damon_sysfs_scheme_filters_nr_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_scheme_filters); static const struct kobj_type damon_sysfs_scheme_filters_ktype = { .release = damon_sysfs_scheme_filters_release, .sysfs_ops = &kobj_sysfs_ops, .default_groups = damon_sysfs_scheme_filters_groups, }; /* * watermarks directory */ struct damon_sysfs_watermarks { struct kobject kobj; enum damos_wmark_metric metric; unsigned long interval_us; unsigned long high; unsigned long mid; unsigned long low; }; static struct damon_sysfs_watermarks *damon_sysfs_watermarks_alloc( enum damos_wmark_metric metric, unsigned long interval_us, unsigned long high, unsigned long mid, unsigned long low) { struct damon_sysfs_watermarks *watermarks = kmalloc( sizeof(*watermarks), GFP_KERNEL); if (!watermarks) return NULL; watermarks->kobj = (struct kobject){}; watermarks->metric = metric; watermarks->interval_us = interval_us; watermarks->high = high; watermarks->mid = mid; watermarks->low = low; return watermarks; } /* Should match with enum damos_wmark_metric */ static const char * const damon_sysfs_wmark_metric_strs[] = { "none", "free_mem_rate", }; static ssize_t metric_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_watermarks *watermarks = container_of(kobj, struct damon_sysfs_watermarks, kobj); return sysfs_emit(buf, "%s\n", damon_sysfs_wmark_metric_strs[watermarks->metric]); } static ssize_t metric_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_watermarks *watermarks = container_of(kobj, struct damon_sysfs_watermarks, kobj); enum damos_wmark_metric metric; for (metric = 0; metric < NR_DAMOS_WMARK_METRICS; metric++) { if (sysfs_streq(buf, damon_sysfs_wmark_metric_strs[metric])) { watermarks->metric = metric; return count; } } return -EINVAL; } static ssize_t interval_us_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_watermarks *watermarks = container_of(kobj, struct damon_sysfs_watermarks, kobj); return sysfs_emit(buf, "%lu\n", watermarks->interval_us); } static ssize_t interval_us_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_watermarks *watermarks = container_of(kobj, struct damon_sysfs_watermarks, kobj); int err = kstrtoul(buf, 0, &watermarks->interval_us); return err ? err : count; } static ssize_t high_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_watermarks *watermarks = container_of(kobj, struct damon_sysfs_watermarks, kobj); return sysfs_emit(buf, "%lu\n", watermarks->high); } static ssize_t high_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_watermarks *watermarks = container_of(kobj, struct damon_sysfs_watermarks, kobj); int err = kstrtoul(buf, 0, &watermarks->high); return err ? err : count; } static ssize_t mid_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_watermarks *watermarks = container_of(kobj, struct damon_sysfs_watermarks, kobj); return sysfs_emit(buf, "%lu\n", watermarks->mid); } static ssize_t mid_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_watermarks *watermarks = container_of(kobj, struct damon_sysfs_watermarks, kobj); int err = kstrtoul(buf, 0, &watermarks->mid); return err ? err : count; } static ssize_t low_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_watermarks *watermarks = container_of(kobj, struct damon_sysfs_watermarks, kobj); return sysfs_emit(buf, "%lu\n", watermarks->low); } static ssize_t low_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_watermarks *watermarks = container_of(kobj, struct damon_sysfs_watermarks, kobj); int err = kstrtoul(buf, 0, &watermarks->low); return err ? err : count; } static void damon_sysfs_watermarks_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_watermarks, kobj)); } static struct kobj_attribute damon_sysfs_watermarks_metric_attr = __ATTR_RW_MODE(metric, 0600); static struct kobj_attribute damon_sysfs_watermarks_interval_us_attr = __ATTR_RW_MODE(interval_us, 0600); static struct kobj_attribute damon_sysfs_watermarks_high_attr = __ATTR_RW_MODE(high, 0600); static struct kobj_attribute damon_sysfs_watermarks_mid_attr = __ATTR_RW_MODE(mid, 0600); static struct kobj_attribute damon_sysfs_watermarks_low_attr = __ATTR_RW_MODE(low, 0600); static struct attribute *damon_sysfs_watermarks_attrs[] = { &damon_sysfs_watermarks_metric_attr.attr, &damon_sysfs_watermarks_interval_us_attr.attr, &damon_sysfs_watermarks_high_attr.attr, &damon_sysfs_watermarks_mid_attr.attr, &damon_sysfs_watermarks_low_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_watermarks); static const struct kobj_type damon_sysfs_watermarks_ktype = { .release = damon_sysfs_watermarks_release, .sysfs_ops = &kobj_sysfs_ops, .default_groups = damon_sysfs_watermarks_groups, }; /* * scheme/weights directory */ struct damon_sysfs_weights { struct kobject kobj; unsigned int sz; unsigned int nr_accesses; unsigned int age; }; static struct damon_sysfs_weights *damon_sysfs_weights_alloc(unsigned int sz, unsigned int nr_accesses, unsigned int age) { struct damon_sysfs_weights *weights = kmalloc(sizeof(*weights), GFP_KERNEL); if (!weights) return NULL; weights->kobj = (struct kobject){}; weights->sz = sz; weights->nr_accesses = nr_accesses; weights->age = age; return weights; } static ssize_t sz_permil_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_weights *weights = container_of(kobj, struct damon_sysfs_weights, kobj); return sysfs_emit(buf, "%u\n", weights->sz); } static ssize_t sz_permil_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_weights *weights = container_of(kobj, struct damon_sysfs_weights, kobj); int err = kstrtouint(buf, 0, &weights->sz); return err ? err : count; } static ssize_t nr_accesses_permil_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_weights *weights = container_of(kobj, struct damon_sysfs_weights, kobj); return sysfs_emit(buf, "%u\n", weights->nr_accesses); } static ssize_t nr_accesses_permil_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_weights *weights = container_of(kobj, struct damon_sysfs_weights, kobj); int err = kstrtouint(buf, 0, &weights->nr_accesses); return err ? err : count; } static ssize_t age_permil_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_weights *weights = container_of(kobj, struct damon_sysfs_weights, kobj); return sysfs_emit(buf, "%u\n", weights->age); } static ssize_t age_permil_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_weights *weights = container_of(kobj, struct damon_sysfs_weights, kobj); int err = kstrtouint(buf, 0, &weights->age); return err ? err : count; } static void damon_sysfs_weights_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_weights, kobj)); } static struct kobj_attribute damon_sysfs_weights_sz_attr = __ATTR_RW_MODE(sz_permil, 0600); static struct kobj_attribute damon_sysfs_weights_nr_accesses_attr = __ATTR_RW_MODE(nr_accesses_permil, 0600); static struct kobj_attribute damon_sysfs_weights_age_attr = __ATTR_RW_MODE(age_permil, 0600); static struct attribute *damon_sysfs_weights_attrs[] = { &damon_sysfs_weights_sz_attr.attr, &damon_sysfs_weights_nr_accesses_attr.attr, &damon_sysfs_weights_age_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_weights); static const struct kobj_type damon_sysfs_weights_ktype = { .release = damon_sysfs_weights_release, .sysfs_ops = &kobj_sysfs_ops, .default_groups = damon_sysfs_weights_groups, }; /* * quotas directory */ struct damon_sysfs_quotas { struct kobject kobj; struct damon_sysfs_weights *weights; unsigned long ms; unsigned long sz; unsigned long reset_interval_ms; }; static struct damon_sysfs_quotas *damon_sysfs_quotas_alloc(void) { return kzalloc(sizeof(struct damon_sysfs_quotas), GFP_KERNEL); } static int damon_sysfs_quotas_add_dirs(struct damon_sysfs_quotas *quotas) { struct damon_sysfs_weights *weights; int err; weights = damon_sysfs_weights_alloc(0, 0, 0); if (!weights) return -ENOMEM; err = kobject_init_and_add(&weights->kobj, &damon_sysfs_weights_ktype, "as->kobj, "weights"); if (err) kobject_put(&weights->kobj); else quotas->weights = weights; return err; } static void damon_sysfs_quotas_rm_dirs(struct damon_sysfs_quotas *quotas) { kobject_put("as->weights->kobj); } static ssize_t ms_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_quotas *quotas = container_of(kobj, struct damon_sysfs_quotas, kobj); return sysfs_emit(buf, "%lu\n", quotas->ms); } static ssize_t ms_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_quotas *quotas = container_of(kobj, struct damon_sysfs_quotas, kobj); int err = kstrtoul(buf, 0, "as->ms); if (err) return -EINVAL; return count; } static ssize_t bytes_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_quotas *quotas = container_of(kobj, struct damon_sysfs_quotas, kobj); return sysfs_emit(buf, "%lu\n", quotas->sz); } static ssize_t bytes_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_quotas *quotas = container_of(kobj, struct damon_sysfs_quotas, kobj); int err = kstrtoul(buf, 0, "as->sz); if (err) return -EINVAL; return count; } static ssize_t reset_interval_ms_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_quotas *quotas = container_of(kobj, struct damon_sysfs_quotas, kobj); return sysfs_emit(buf, "%lu\n", quotas->reset_interval_ms); } static ssize_t reset_interval_ms_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_quotas *quotas = container_of(kobj, struct damon_sysfs_quotas, kobj); int err = kstrtoul(buf, 0, "as->reset_interval_ms); if (err) return -EINVAL; return count; } static void damon_sysfs_quotas_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_quotas, kobj)); } static struct kobj_attribute damon_sysfs_quotas_ms_attr = __ATTR_RW_MODE(ms, 0600); static struct kobj_attribute damon_sysfs_quotas_sz_attr = __ATTR_RW_MODE(bytes, 0600); static struct kobj_attribute damon_sysfs_quotas_reset_interval_ms_attr = __ATTR_RW_MODE(reset_interval_ms, 0600); static struct attribute *damon_sysfs_quotas_attrs[] = { &damon_sysfs_quotas_ms_attr.attr, &damon_sysfs_quotas_sz_attr.attr, &damon_sysfs_quotas_reset_interval_ms_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_quotas); static const struct kobj_type damon_sysfs_quotas_ktype = { .release = damon_sysfs_quotas_release, .sysfs_ops = &kobj_sysfs_ops, .default_groups = damon_sysfs_quotas_groups, }; /* * access_pattern directory */ struct damon_sysfs_access_pattern { struct kobject kobj; struct damon_sysfs_ul_range *sz; struct damon_sysfs_ul_range *nr_accesses; struct damon_sysfs_ul_range *age; }; static struct damon_sysfs_access_pattern *damon_sysfs_access_pattern_alloc(void) { struct damon_sysfs_access_pattern *access_pattern = kmalloc(sizeof(*access_pattern), GFP_KERNEL); if (!access_pattern) return NULL; access_pattern->kobj = (struct kobject){}; return access_pattern; } static int damon_sysfs_access_pattern_add_range_dir( struct damon_sysfs_access_pattern *access_pattern, struct damon_sysfs_ul_range **range_dir_ptr, char *name) { struct damon_sysfs_ul_range *range = damon_sysfs_ul_range_alloc(0, 0); int err; if (!range) return -ENOMEM; err = kobject_init_and_add(&range->kobj, &damon_sysfs_ul_range_ktype, &access_pattern->kobj, name); if (err) kobject_put(&range->kobj); else *range_dir_ptr = range; return err; } static int damon_sysfs_access_pattern_add_dirs( struct damon_sysfs_access_pattern *access_pattern) { int err; err = damon_sysfs_access_pattern_add_range_dir(access_pattern, &access_pattern->sz, "sz"); if (err) goto put_sz_out; err = damon_sysfs_access_pattern_add_range_dir(access_pattern, &access_pattern->nr_accesses, "nr_accesses"); if (err) goto put_nr_accesses_sz_out; err = damon_sysfs_access_pattern_add_range_dir(access_pattern, &access_pattern->age, "age"); if (err) goto put_age_nr_accesses_sz_out; return 0; put_age_nr_accesses_sz_out: kobject_put(&access_pattern->age->kobj); access_pattern->age = NULL; put_nr_accesses_sz_out: kobject_put(&access_pattern->nr_accesses->kobj); access_pattern->nr_accesses = NULL; put_sz_out: kobject_put(&access_pattern->sz->kobj); access_pattern->sz = NULL; return err; } static void damon_sysfs_access_pattern_rm_dirs( struct damon_sysfs_access_pattern *access_pattern) { kobject_put(&access_pattern->sz->kobj); kobject_put(&access_pattern->nr_accesses->kobj); kobject_put(&access_pattern->age->kobj); } static void damon_sysfs_access_pattern_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_access_pattern, kobj)); } static struct attribute *damon_sysfs_access_pattern_attrs[] = { NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_access_pattern); static const struct kobj_type damon_sysfs_access_pattern_ktype = { .release = damon_sysfs_access_pattern_release, .sysfs_ops = &kobj_sysfs_ops, .default_groups = damon_sysfs_access_pattern_groups, }; /* * scheme directory */ struct damon_sysfs_scheme { struct kobject kobj; enum damos_action action; struct damon_sysfs_access_pattern *access_pattern; struct damon_sysfs_quotas *quotas; struct damon_sysfs_watermarks *watermarks; struct damon_sysfs_scheme_filters *filters; struct damon_sysfs_stats *stats; struct damon_sysfs_scheme_regions *tried_regions; }; /* This should match with enum damos_action */ static const char * const damon_sysfs_damos_action_strs[] = { "willneed", "cold", "pageout", "hugepage", "nohugepage", "lru_prio", "lru_deprio", "stat", }; static struct damon_sysfs_scheme *damon_sysfs_scheme_alloc( enum damos_action action) { struct damon_sysfs_scheme *scheme = kmalloc(sizeof(*scheme), GFP_KERNEL); if (!scheme) return NULL; scheme->kobj = (struct kobject){}; scheme->action = action; return scheme; } static int damon_sysfs_scheme_set_access_pattern( struct damon_sysfs_scheme *scheme) { struct damon_sysfs_access_pattern *access_pattern; int err; access_pattern = damon_sysfs_access_pattern_alloc(); if (!access_pattern) return -ENOMEM; err = kobject_init_and_add(&access_pattern->kobj, &damon_sysfs_access_pattern_ktype, &scheme->kobj, "access_pattern"); if (err) goto out; err = damon_sysfs_access_pattern_add_dirs(access_pattern); if (err) goto out; scheme->access_pattern = access_pattern; return 0; out: kobject_put(&access_pattern->kobj); return err; } static int damon_sysfs_scheme_set_quotas(struct damon_sysfs_scheme *scheme) { struct damon_sysfs_quotas *quotas = damon_sysfs_quotas_alloc(); int err; if (!quotas) return -ENOMEM; err = kobject_init_and_add("as->kobj, &damon_sysfs_quotas_ktype, &scheme->kobj, "quotas"); if (err) goto out; err = damon_sysfs_quotas_add_dirs(quotas); if (err) goto out; scheme->quotas = quotas; return 0; out: kobject_put("as->kobj); return err; } static int damon_sysfs_scheme_set_watermarks(struct damon_sysfs_scheme *scheme) { struct damon_sysfs_watermarks *watermarks = damon_sysfs_watermarks_alloc(DAMOS_WMARK_NONE, 0, 0, 0, 0); int err; if (!watermarks) return -ENOMEM; err = kobject_init_and_add(&watermarks->kobj, &damon_sysfs_watermarks_ktype, &scheme->kobj, "watermarks"); if (err) kobject_put(&watermarks->kobj); else scheme->watermarks = watermarks; return err; } static int damon_sysfs_scheme_set_filters(struct damon_sysfs_scheme *scheme) { struct damon_sysfs_scheme_filters *filters = damon_sysfs_scheme_filters_alloc(); int err; if (!filters) return -ENOMEM; err = kobject_init_and_add(&filters->kobj, &damon_sysfs_scheme_filters_ktype, &scheme->kobj, "filters"); if (err) kobject_put(&filters->kobj); else scheme->filters = filters; return err; } static int damon_sysfs_scheme_set_stats(struct damon_sysfs_scheme *scheme) { struct damon_sysfs_stats *stats = damon_sysfs_stats_alloc(); int err; if (!stats) return -ENOMEM; err = kobject_init_and_add(&stats->kobj, &damon_sysfs_stats_ktype, &scheme->kobj, "stats"); if (err) kobject_put(&stats->kobj); else scheme->stats = stats; return err; } static int damon_sysfs_scheme_set_tried_regions( struct damon_sysfs_scheme *scheme) { struct damon_sysfs_scheme_regions *tried_regions = damon_sysfs_scheme_regions_alloc(); int err; if (!tried_regions) return -ENOMEM; err = kobject_init_and_add(&tried_regions->kobj, &damon_sysfs_scheme_regions_ktype, &scheme->kobj, "tried_regions"); if (err) kobject_put(&tried_regions->kobj); else scheme->tried_regions = tried_regions; return err; } static int damon_sysfs_scheme_add_dirs(struct damon_sysfs_scheme *scheme) { int err; err = damon_sysfs_scheme_set_access_pattern(scheme); if (err) return err; err = damon_sysfs_scheme_set_quotas(scheme); if (err) goto put_access_pattern_out; err = damon_sysfs_scheme_set_watermarks(scheme); if (err) goto put_quotas_access_pattern_out; err = damon_sysfs_scheme_set_filters(scheme); if (err) goto put_watermarks_quotas_access_pattern_out; err = damon_sysfs_scheme_set_stats(scheme); if (err) goto put_filters_watermarks_quotas_access_pattern_out; err = damon_sysfs_scheme_set_tried_regions(scheme); if (err) goto put_tried_regions_out; return 0; put_tried_regions_out: kobject_put(&scheme->tried_regions->kobj); scheme->tried_regions = NULL; put_filters_watermarks_quotas_access_pattern_out: kobject_put(&scheme->filters->kobj); scheme->filters = NULL; put_watermarks_quotas_access_pattern_out: kobject_put(&scheme->watermarks->kobj); scheme->watermarks = NULL; put_quotas_access_pattern_out: kobject_put(&scheme->quotas->kobj); scheme->quotas = NULL; put_access_pattern_out: kobject_put(&scheme->access_pattern->kobj); scheme->access_pattern = NULL; return err; } static void damon_sysfs_scheme_rm_dirs(struct damon_sysfs_scheme *scheme) { damon_sysfs_access_pattern_rm_dirs(scheme->access_pattern); kobject_put(&scheme->access_pattern->kobj); damon_sysfs_quotas_rm_dirs(scheme->quotas); kobject_put(&scheme->quotas->kobj); kobject_put(&scheme->watermarks->kobj); damon_sysfs_scheme_filters_rm_dirs(scheme->filters); kobject_put(&scheme->filters->kobj); kobject_put(&scheme->stats->kobj); damon_sysfs_scheme_regions_rm_dirs(scheme->tried_regions); kobject_put(&scheme->tried_regions->kobj); } static ssize_t action_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_scheme *scheme = container_of(kobj, struct damon_sysfs_scheme, kobj); return sysfs_emit(buf, "%s\n", damon_sysfs_damos_action_strs[scheme->action]); } static ssize_t action_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_scheme *scheme = container_of(kobj, struct damon_sysfs_scheme, kobj); enum damos_action action; for (action = 0; action < NR_DAMOS_ACTIONS; action++) { if (sysfs_streq(buf, damon_sysfs_damos_action_strs[action])) { scheme->action = action; return count; } } return -EINVAL; } static void damon_sysfs_scheme_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_scheme, kobj)); } static struct kobj_attribute damon_sysfs_scheme_action_attr = __ATTR_RW_MODE(action, 0600); static struct attribute *damon_sysfs_scheme_attrs[] = { &damon_sysfs_scheme_action_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_scheme); static const struct kobj_type damon_sysfs_scheme_ktype = { .release = damon_sysfs_scheme_release, .sysfs_ops = &kobj_sysfs_ops, .default_groups = damon_sysfs_scheme_groups, }; /* * schemes directory */ struct damon_sysfs_schemes *damon_sysfs_schemes_alloc(void) { return kzalloc(sizeof(struct damon_sysfs_schemes), GFP_KERNEL); } void damon_sysfs_schemes_rm_dirs(struct damon_sysfs_schemes *schemes) { struct damon_sysfs_scheme **schemes_arr = schemes->schemes_arr; int i; for (i = 0; i < schemes->nr; i++) { damon_sysfs_scheme_rm_dirs(schemes_arr[i]); kobject_put(&schemes_arr[i]->kobj); } schemes->nr = 0; kfree(schemes_arr); schemes->schemes_arr = NULL; } static int damon_sysfs_schemes_add_dirs(struct damon_sysfs_schemes *schemes, int nr_schemes) { struct damon_sysfs_scheme **schemes_arr, *scheme; int err, i; damon_sysfs_schemes_rm_dirs(schemes); if (!nr_schemes) return 0; schemes_arr = kmalloc_array(nr_schemes, sizeof(*schemes_arr), GFP_KERNEL | __GFP_NOWARN); if (!schemes_arr) return -ENOMEM; schemes->schemes_arr = schemes_arr; for (i = 0; i < nr_schemes; i++) { scheme = damon_sysfs_scheme_alloc(DAMOS_STAT); if (!scheme) { damon_sysfs_schemes_rm_dirs(schemes); return -ENOMEM; } err = kobject_init_and_add(&scheme->kobj, &damon_sysfs_scheme_ktype, &schemes->kobj, "%d", i); if (err) goto out; err = damon_sysfs_scheme_add_dirs(scheme); if (err) goto out; schemes_arr[i] = scheme; schemes->nr++; } return 0; out: damon_sysfs_schemes_rm_dirs(schemes); kobject_put(&scheme->kobj); return err; } static ssize_t nr_schemes_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) { struct damon_sysfs_schemes *schemes = container_of(kobj, struct damon_sysfs_schemes, kobj); return sysfs_emit(buf, "%d\n", schemes->nr); } static ssize_t nr_schemes_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { struct damon_sysfs_schemes *schemes; int nr, err = kstrtoint(buf, 0, &nr); if (err) return err; if (nr < 0) return -EINVAL; schemes = container_of(kobj, struct damon_sysfs_schemes, kobj); if (!mutex_trylock(&damon_sysfs_lock)) return -EBUSY; err = damon_sysfs_schemes_add_dirs(schemes, nr); mutex_unlock(&damon_sysfs_lock); if (err) return err; return count; } static void damon_sysfs_schemes_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_schemes, kobj)); } static struct kobj_attribute damon_sysfs_schemes_nr_attr = __ATTR_RW_MODE(nr_schemes, 0600); static struct attribute *damon_sysfs_schemes_attrs[] = { &damon_sysfs_schemes_nr_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_schemes); const struct kobj_type damon_sysfs_schemes_ktype = { .release = damon_sysfs_schemes_release, .sysfs_ops = &kobj_sysfs_ops, .default_groups = damon_sysfs_schemes_groups, }; static bool damon_sysfs_memcg_path_eq(struct mem_cgroup *memcg, char *memcg_path_buf, char *path) { #ifdef CONFIG_MEMCG cgroup_path(memcg->css.cgroup, memcg_path_buf, PATH_MAX); if (sysfs_streq(memcg_path_buf, path)) return true; #endif /* CONFIG_MEMCG */ return false; } static int damon_sysfs_memcg_path_to_id(char *memcg_path, unsigned short *id) { struct mem_cgroup *memcg; char *path; bool found = false; if (!memcg_path) return -EINVAL; path = kmalloc(sizeof(*path) * PATH_MAX, GFP_KERNEL); if (!path) return -ENOMEM; for (memcg = mem_cgroup_iter(NULL, NULL, NULL); memcg; memcg = mem_cgroup_iter(NULL, memcg, NULL)) { /* skip removed memcg */ if (!mem_cgroup_id(memcg)) continue; if (damon_sysfs_memcg_path_eq(memcg, path, memcg_path)) { *id = mem_cgroup_id(memcg); found = true; break; } } kfree(path); return found ? 0 : -EINVAL; } static int damon_sysfs_set_scheme_filters(struct damos *scheme, struct damon_sysfs_scheme_filters *sysfs_filters) { int i; struct damos_filter *filter, *next; damos_for_each_filter_safe(filter, next, scheme) damos_destroy_filter(filter); for (i = 0; i < sysfs_filters->nr; i++) { struct damon_sysfs_scheme_filter *sysfs_filter = sysfs_filters->filters_arr[i]; struct damos_filter *filter = damos_new_filter(sysfs_filter->type, sysfs_filter->matching); int err; if (!filter) return -ENOMEM; if (filter->type == DAMOS_FILTER_TYPE_MEMCG) { err = damon_sysfs_memcg_path_to_id( sysfs_filter->memcg_path, &filter->memcg_id); if (err) { damos_destroy_filter(filter); return err; } } else if (filter->type == DAMOS_FILTER_TYPE_ADDR) { if (sysfs_filter->addr_range.end < sysfs_filter->addr_range.start) { damos_destroy_filter(filter); return -EINVAL; } filter->addr_range = sysfs_filter->addr_range; } else if (filter->type == DAMOS_FILTER_TYPE_TARGET) { filter->target_idx = sysfs_filter->target_idx; } damos_add_filter(scheme, filter); } return 0; } static struct damos *damon_sysfs_mk_scheme( struct damon_sysfs_scheme *sysfs_scheme) { struct damon_sysfs_access_pattern *access_pattern = sysfs_scheme->access_pattern; struct damon_sysfs_quotas *sysfs_quotas = sysfs_scheme->quotas; struct damon_sysfs_weights *sysfs_weights = sysfs_quotas->weights; struct damon_sysfs_watermarks *sysfs_wmarks = sysfs_scheme->watermarks; struct damon_sysfs_scheme_filters *sysfs_filters = sysfs_scheme->filters; struct damos *scheme; int err; struct damos_access_pattern pattern = { .min_sz_region = access_pattern->sz->min, .max_sz_region = access_pattern->sz->max, .min_nr_accesses = access_pattern->nr_accesses->min, .max_nr_accesses = access_pattern->nr_accesses->max, .min_age_region = access_pattern->age->min, .max_age_region = access_pattern->age->max, }; struct damos_quota quota = { .ms = sysfs_quotas->ms, .sz = sysfs_quotas->sz, .reset_interval = sysfs_quotas->reset_interval_ms, .weight_sz = sysfs_weights->sz, .weight_nr_accesses = sysfs_weights->nr_accesses, .weight_age = sysfs_weights->age, }; struct damos_watermarks wmarks = { .metric = sysfs_wmarks->metric, .interval = sysfs_wmarks->interval_us, .high = sysfs_wmarks->high, .mid = sysfs_wmarks->mid, .low = sysfs_wmarks->low, }; scheme = damon_new_scheme(&pattern, sysfs_scheme->action, 0, "a, &wmarks); if (!scheme) return NULL; err = damon_sysfs_set_scheme_filters(scheme, sysfs_filters); if (err) { damon_destroy_scheme(scheme); return NULL; } return scheme; } static void damon_sysfs_update_scheme(struct damos *scheme, struct damon_sysfs_scheme *sysfs_scheme) { struct damon_sysfs_access_pattern *access_pattern = sysfs_scheme->access_pattern; struct damon_sysfs_quotas *sysfs_quotas = sysfs_scheme->quotas; struct damon_sysfs_weights *sysfs_weights = sysfs_quotas->weights; struct damon_sysfs_watermarks *sysfs_wmarks = sysfs_scheme->watermarks; int err; scheme->pattern.min_sz_region = access_pattern->sz->min; scheme->pattern.max_sz_region = access_pattern->sz->max; scheme->pattern.min_nr_accesses = access_pattern->nr_accesses->min; scheme->pattern.max_nr_accesses = access_pattern->nr_accesses->max; scheme->pattern.min_age_region = access_pattern->age->min; scheme->pattern.max_age_region = access_pattern->age->max; scheme->action = sysfs_scheme->action; scheme->quota.ms = sysfs_quotas->ms; scheme->quota.sz = sysfs_quotas->sz; scheme->quota.reset_interval = sysfs_quotas->reset_interval_ms; scheme->quota.weight_sz = sysfs_weights->sz; scheme->quota.weight_nr_accesses = sysfs_weights->nr_accesses; scheme->quota.weight_age = sysfs_weights->age; scheme->wmarks.metric = sysfs_wmarks->metric; scheme->wmarks.interval = sysfs_wmarks->interval_us; scheme->wmarks.high = sysfs_wmarks->high; scheme->wmarks.mid = sysfs_wmarks->mid; scheme->wmarks.low = sysfs_wmarks->low; err = damon_sysfs_set_scheme_filters(scheme, sysfs_scheme->filters); if (err) damon_destroy_scheme(scheme); } int damon_sysfs_set_schemes(struct damon_ctx *ctx, struct damon_sysfs_schemes *sysfs_schemes) { struct damos *scheme, *next; int i = 0; damon_for_each_scheme_safe(scheme, next, ctx) { if (i < sysfs_schemes->nr) damon_sysfs_update_scheme(scheme, sysfs_schemes->schemes_arr[i]); else damon_destroy_scheme(scheme); i++; } for (; i < sysfs_schemes->nr; i++) { struct damos *scheme, *next; scheme = damon_sysfs_mk_scheme(sysfs_schemes->schemes_arr[i]); if (!scheme) { damon_for_each_scheme_safe(scheme, next, ctx) damon_destroy_scheme(scheme); return -ENOMEM; } damon_add_scheme(ctx, scheme); } return 0; } void damon_sysfs_schemes_update_stats( struct damon_sysfs_schemes *sysfs_schemes, struct damon_ctx *ctx) { struct damos *scheme; int schemes_idx = 0; damon_for_each_scheme(scheme, ctx) { struct damon_sysfs_stats *sysfs_stats; /* user could have removed the scheme sysfs dir */ if (schemes_idx >= sysfs_schemes->nr) break; sysfs_stats = sysfs_schemes->schemes_arr[schemes_idx++]->stats; sysfs_stats->nr_tried = scheme->stat.nr_tried; sysfs_stats->sz_tried = scheme->stat.sz_tried; sysfs_stats->nr_applied = scheme->stat.nr_applied; sysfs_stats->sz_applied = scheme->stat.sz_applied; sysfs_stats->qt_exceeds = scheme->stat.qt_exceeds; } } /* * damon_sysfs_schemes that need to update its schemes regions dir. Protected * by damon_sysfs_lock */ static struct damon_sysfs_schemes *damon_sysfs_schemes_for_damos_callback; static int damon_sysfs_schemes_region_idx; static bool damos_regions_upd_total_bytes_only; /* * DAMON callback that called before damos apply. While this callback is * registered, damon_sysfs_lock should be held to ensure the regions * directories exist. */ static int damon_sysfs_before_damos_apply(struct damon_ctx *ctx, struct damon_target *t, struct damon_region *r, struct damos *s) { struct damos *scheme; struct damon_sysfs_scheme_regions *sysfs_regions; struct damon_sysfs_scheme_region *region; struct damon_sysfs_schemes *sysfs_schemes = damon_sysfs_schemes_for_damos_callback; int schemes_idx = 0; damon_for_each_scheme(scheme, ctx) { if (scheme == s) break; schemes_idx++; } /* user could have removed the scheme sysfs dir */ if (schemes_idx >= sysfs_schemes->nr) return 0; sysfs_regions = sysfs_schemes->schemes_arr[schemes_idx]->tried_regions; sysfs_regions->total_bytes += r->ar.end - r->ar.start; if (damos_regions_upd_total_bytes_only) return 0; region = damon_sysfs_scheme_region_alloc(r); if (!region) return 0; list_add_tail(®ion->list, &sysfs_regions->regions_list); sysfs_regions->nr_regions++; if (kobject_init_and_add(®ion->kobj, &damon_sysfs_scheme_region_ktype, &sysfs_regions->kobj, "%d", damon_sysfs_schemes_region_idx++)) { kobject_put(®ion->kobj); } return 0; } /* Called from damon_sysfs_cmd_request_callback under damon_sysfs_lock */ int damon_sysfs_schemes_clear_regions( struct damon_sysfs_schemes *sysfs_schemes, struct damon_ctx *ctx) { struct damos *scheme; int schemes_idx = 0; damon_for_each_scheme(scheme, ctx) { struct damon_sysfs_scheme *sysfs_scheme; /* user could have removed the scheme sysfs dir */ if (schemes_idx >= sysfs_schemes->nr) break; sysfs_scheme = sysfs_schemes->schemes_arr[schemes_idx++]; damon_sysfs_scheme_regions_rm_dirs( sysfs_scheme->tried_regions); sysfs_scheme->tried_regions->total_bytes = 0; } return 0; } /* Called from damon_sysfs_cmd_request_callback under damon_sysfs_lock */ int damon_sysfs_schemes_update_regions_start( struct damon_sysfs_schemes *sysfs_schemes, struct damon_ctx *ctx, bool total_bytes_only) { damon_sysfs_schemes_clear_regions(sysfs_schemes, ctx); damon_sysfs_schemes_for_damos_callback = sysfs_schemes; damos_regions_upd_total_bytes_only = total_bytes_only; ctx->callback.before_damos_apply = damon_sysfs_before_damos_apply; return 0; } /* * Called from damon_sysfs_cmd_request_callback under damon_sysfs_lock. Caller * should unlock damon_sysfs_lock which held before * damon_sysfs_schemes_update_regions_start() */ int damon_sysfs_schemes_update_regions_stop(struct damon_ctx *ctx) { damon_sysfs_schemes_for_damos_callback = NULL; ctx->callback.before_damos_apply = NULL; damon_sysfs_schemes_region_idx = 0; return 0; }