diff options
Diffstat (limited to 'mm/damon/sysfs-schemes.c')
| -rw-r--r-- | mm/damon/sysfs-schemes.c | 276 |
1 files changed, 273 insertions, 3 deletions
diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c index 786b06239c..ae0f0b314f 100644 --- a/mm/damon/sysfs-schemes.c +++ b/mm/damon/sysfs-schemes.c @@ -821,6 +821,203 @@ static const struct kobj_type damon_sysfs_watermarks_ktype = { }; /* + * quota goal directory + */ + +struct damos_sysfs_quota_goal { + struct kobject kobj; + unsigned long target_value; + unsigned long current_value; +}; + +static struct damos_sysfs_quota_goal *damos_sysfs_quota_goal_alloc(void) +{ + return kzalloc(sizeof(struct damos_sysfs_quota_goal), GFP_KERNEL); +} + +static ssize_t target_value_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct damos_sysfs_quota_goal *goal = container_of(kobj, struct + damos_sysfs_quota_goal, kobj); + + return sysfs_emit(buf, "%lu\n", goal->target_value); +} + +static ssize_t target_value_store(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, size_t count) +{ + struct damos_sysfs_quota_goal *goal = container_of(kobj, struct + damos_sysfs_quota_goal, kobj); + int err = kstrtoul(buf, 0, &goal->target_value); + + return err ? err : count; +} + +static ssize_t current_value_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct damos_sysfs_quota_goal *goal = container_of(kobj, struct + damos_sysfs_quota_goal, kobj); + + return sysfs_emit(buf, "%lu\n", goal->current_value); +} + +static ssize_t current_value_store(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, size_t count) +{ + struct damos_sysfs_quota_goal *goal = container_of(kobj, struct + damos_sysfs_quota_goal, kobj); + int err = kstrtoul(buf, 0, &goal->current_value); + + /* feed callback should check existence of this file and read value */ + return err ? err : count; +} + +static void damos_sysfs_quota_goal_release(struct kobject *kobj) +{ + /* or, notify this release to the feed callback */ + kfree(container_of(kobj, struct damos_sysfs_quota_goal, kobj)); +} + +static struct kobj_attribute damos_sysfs_quota_goal_target_value_attr = + __ATTR_RW_MODE(target_value, 0600); + +static struct kobj_attribute damos_sysfs_quota_goal_current_value_attr = + __ATTR_RW_MODE(current_value, 0600); + +static struct attribute *damos_sysfs_quota_goal_attrs[] = { + &damos_sysfs_quota_goal_target_value_attr.attr, + &damos_sysfs_quota_goal_current_value_attr.attr, + NULL, +}; +ATTRIBUTE_GROUPS(damos_sysfs_quota_goal); + +static const struct kobj_type damos_sysfs_quota_goal_ktype = { + .release = damos_sysfs_quota_goal_release, + .sysfs_ops = &kobj_sysfs_ops, + .default_groups = damos_sysfs_quota_goal_groups, +}; + +/* + * quota goals directory + */ + +struct damos_sysfs_quota_goals { + struct kobject kobj; + struct damos_sysfs_quota_goal **goals_arr; /* counted by nr */ + int nr; +}; + +static struct damos_sysfs_quota_goals *damos_sysfs_quota_goals_alloc(void) +{ + return kzalloc(sizeof(struct damos_sysfs_quota_goals), GFP_KERNEL); +} + +static void damos_sysfs_quota_goals_rm_dirs( + struct damos_sysfs_quota_goals *goals) +{ + struct damos_sysfs_quota_goal **goals_arr = goals->goals_arr; + int i; + + for (i = 0; i < goals->nr; i++) + kobject_put(&goals_arr[i]->kobj); + goals->nr = 0; + kfree(goals_arr); + goals->goals_arr = NULL; +} + +static int damos_sysfs_quota_goals_add_dirs( + struct damos_sysfs_quota_goals *goals, int nr_goals) +{ + struct damos_sysfs_quota_goal **goals_arr, *goal; + int err, i; + + damos_sysfs_quota_goals_rm_dirs(goals); + if (!nr_goals) + return 0; + + goals_arr = kmalloc_array(nr_goals, sizeof(*goals_arr), + GFP_KERNEL | __GFP_NOWARN); + if (!goals_arr) + return -ENOMEM; + goals->goals_arr = goals_arr; + + for (i = 0; i < nr_goals; i++) { + goal = damos_sysfs_quota_goal_alloc(); + if (!goal) { + damos_sysfs_quota_goals_rm_dirs(goals); + return -ENOMEM; + } + + err = kobject_init_and_add(&goal->kobj, + &damos_sysfs_quota_goal_ktype, &goals->kobj, + "%d", i); + if (err) { + kobject_put(&goal->kobj); + damos_sysfs_quota_goals_rm_dirs(goals); + return err; + } + + goals_arr[i] = goal; + goals->nr++; + } + return 0; +} + +static ssize_t nr_goals_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct damos_sysfs_quota_goals *goals = container_of(kobj, + struct damos_sysfs_quota_goals, kobj); + + return sysfs_emit(buf, "%d\n", goals->nr); +} + +static ssize_t nr_goals_store(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, size_t count) +{ + struct damos_sysfs_quota_goals *goals; + int nr, err = kstrtoint(buf, 0, &nr); + + if (err) + return err; + if (nr < 0) + return -EINVAL; + + goals = container_of(kobj, struct damos_sysfs_quota_goals, kobj); + + if (!mutex_trylock(&damon_sysfs_lock)) + return -EBUSY; + err = damos_sysfs_quota_goals_add_dirs(goals, nr); + mutex_unlock(&damon_sysfs_lock); + if (err) + return err; + + return count; +} + +static void damos_sysfs_quota_goals_release(struct kobject *kobj) +{ + kfree(container_of(kobj, struct damos_sysfs_quota_goals, kobj)); +} + +static struct kobj_attribute damos_sysfs_quota_goals_nr_attr = + __ATTR_RW_MODE(nr_goals, 0600); + +static struct attribute *damos_sysfs_quota_goals_attrs[] = { + &damos_sysfs_quota_goals_nr_attr.attr, + NULL, +}; +ATTRIBUTE_GROUPS(damos_sysfs_quota_goals); + +static const struct kobj_type damos_sysfs_quota_goals_ktype = { + .release = damos_sysfs_quota_goals_release, + .sysfs_ops = &kobj_sysfs_ops, + .default_groups = damos_sysfs_quota_goals_groups, +}; + +/* * scheme/weights directory */ @@ -938,6 +1135,7 @@ static const struct kobj_type damon_sysfs_weights_ktype = { struct damon_sysfs_quotas { struct kobject kobj; struct damon_sysfs_weights *weights; + struct damos_sysfs_quota_goals *goals; unsigned long ms; unsigned long sz; unsigned long reset_interval_ms; @@ -951,6 +1149,7 @@ static struct damon_sysfs_quotas *damon_sysfs_quotas_alloc(void) static int damon_sysfs_quotas_add_dirs(struct damon_sysfs_quotas *quotas) { struct damon_sysfs_weights *weights; + struct damos_sysfs_quota_goals *goals; int err; weights = damon_sysfs_weights_alloc(0, 0, 0); @@ -959,16 +1158,35 @@ static int damon_sysfs_quotas_add_dirs(struct damon_sysfs_quotas *quotas) err = kobject_init_and_add(&weights->kobj, &damon_sysfs_weights_ktype, "as->kobj, "weights"); - if (err) + if (err) { kobject_put(&weights->kobj); - else - quotas->weights = weights; + return err; + } + quotas->weights = weights; + + goals = damos_sysfs_quota_goals_alloc(); + if (!goals) { + kobject_put(&weights->kobj); + return -ENOMEM; + } + err = kobject_init_and_add(&goals->kobj, + &damos_sysfs_quota_goals_ktype, "as->kobj, + "goals"); + if (err) { + kobject_put(&weights->kobj); + kobject_put(&goals->kobj); + } else { + quotas->goals = goals; + } + return err; } static void damon_sysfs_quotas_rm_dirs(struct damon_sysfs_quotas *quotas) { kobject_put("as->weights->kobj); + damos_sysfs_quota_goals_rm_dirs(quotas->goals); + kobject_put("as->goals->kobj); } static ssize_t ms_show(struct kobject *kobj, struct kobj_attribute *attr, @@ -1650,6 +1868,54 @@ static int damon_sysfs_set_scheme_filters(struct damos *scheme, return 0; } +static unsigned long damos_sysfs_get_quota_score(void *arg) +{ + return (unsigned long)arg; +} + +static void damos_sysfs_set_quota_score( + struct damos_sysfs_quota_goals *sysfs_goals, + struct damos_quota *quota) +{ + struct damos_sysfs_quota_goal *sysfs_goal; + int i; + + quota->get_score = NULL; + quota->get_score_arg = (void *)0; + for (i = 0; i < sysfs_goals->nr; i++) { + sysfs_goal = sysfs_goals->goals_arr[i]; + if (!sysfs_goal->target_value) + continue; + + /* Higher score makes scheme less aggressive */ + quota->get_score_arg = (void *)max( + (unsigned long)quota->get_score_arg, + sysfs_goal->current_value * 10000 / + sysfs_goal->target_value); + quota->get_score = damos_sysfs_get_quota_score; + } +} + +void damos_sysfs_set_quota_scores(struct damon_sysfs_schemes *sysfs_schemes, + struct damon_ctx *ctx) +{ + struct damos *scheme; + int i = 0; + + damon_for_each_scheme(scheme, ctx) { + struct damon_sysfs_scheme *sysfs_scheme; + + /* user could have removed the scheme sysfs dir */ + if (i >= sysfs_schemes->nr) + break; + + sysfs_scheme = sysfs_schemes->schemes_arr[i]; + damos_sysfs_set_quota_score(sysfs_scheme->quotas->goals, + &scheme->quota); + i++; + } +} + static struct damos *damon_sysfs_mk_scheme( struct damon_sysfs_scheme *sysfs_scheme) { @@ -1687,6 +1953,8 @@ static struct damos *damon_sysfs_mk_scheme( .low = sysfs_wmarks->low, }; + damos_sysfs_set_quota_score(sysfs_quotas->goals, "a); + scheme = damon_new_scheme(&pattern, sysfs_scheme->action, sysfs_scheme->apply_interval_us, "a, &wmarks); if (!scheme) @@ -1727,6 +1995,8 @@ static void damon_sysfs_update_scheme(struct damos *scheme, scheme->quota.weight_nr_accesses = sysfs_weights->nr_accesses; scheme->quota.weight_age = sysfs_weights->age; + damos_sysfs_set_quota_score(sysfs_quotas->goals, &scheme->quota); + scheme->wmarks.metric = sysfs_wmarks->metric; scheme->wmarks.interval = sysfs_wmarks->interval_us; scheme->wmarks.high = sysfs_wmarks->high; |