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Date: Wed, 23 Feb 2022 15:20:49 +0000
From: SeongJae Park <sj@...nel.org>
To: akpm@...ux-foundation.org
Cc: corbet@....net, skhan@...uxfoundation.org, rientjes@...gle.com,
xhao@...ux.alibaba.com, linux-damon@...zon.com, linux-mm@...ck.org,
linux-doc@...r.kernel.org, linux-kselftest@...r.kernel.org,
linux-kernel@...r.kernel.org, SeongJae Park <sj@...nel.org>
Subject: [PATCH 10/12] mm/damon/sysfs: Support DAMOS stats
This commit makes DAMON sysfs interface supports the DAMOS stats
feature. Specifically, this commit adds 'stats' directory under each
scheme directory, and makes kdamond 'state' file writing
('update_schemes_stats') to update the contents of the files under the
'stats' directory.
As a result, the files hierarchy becomes as below:
/sys/kernel/mm/damon/admin
│ kdamonds/nr
│ │ 0/state,pid
│ │ │ contexts/nr
│ │ │ │ 0/operations
│ │ │ │ │ monitoring_attrs/intervals/sample_us,aggr_us,update_us
│ │ │ │ │ │ nr_regions/min,max
│ │ │ │ │ targets/nr
│ │ │ │ │ │ 0/pid
│ │ │ │ │ │ │ regions/nr
│ │ │ │ │ │ │ │ 0/start,end
│ │ │ │ │ │ │ │ ...
│ │ │ │ │ │ ...
│ │ │ │ │ schemes/nr
│ │ │ │ │ │ 0/action
│ │ │ │ │ │ │ access_pattern/
│ │ │ │ │ │ │ │ sz/min,max
│ │ │ │ │ │ │ │ nr_accesses/min,max
│ │ │ │ │ │ │ │ age/min,max
│ │ │ │ │ │ │ quotas/ms,sz,reset_interval_ms
│ │ │ │ │ │ │ │ weights/sz,nr_accesses,age
│ │ │ │ │ │ │ watermarks/metric,interval_us,high,mid,low
│ │ │ │ │ │ │ stats/ <- NEW DIRECTORY
│ │ │ │ │ │ │ │ nr_tried,sz_tried,nr_applied,sz_applied,qt_exceeds
│ │ │ │ │ │ ...
│ │ │ │ ...
│ │ ...
Signed-off-by: SeongJae Park <sj@...nel.org>
---
mm/damon/sysfs.c | 215 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 215 insertions(+)
diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c
index 9e54ed7316c6..a4ad6b473b0a 100644
--- a/mm/damon/sysfs.c
+++ b/mm/damon/sysfs.c
@@ -115,6 +115,170 @@ static struct kobj_type damon_sysfs_ul_range_ktype = {
.default_groups = damon_sysfs_ul_range_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 damon_sysfs_stats_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 damon_sysfs_stats_nr_tried_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf, size_t count)
+{
+ struct damon_sysfs_stats *stats = container_of(kobj,
+ struct damon_sysfs_stats, kobj);
+ int err = kstrtoul(buf, 0, &stats->nr_tried);
+
+ if (err)
+ return -EINVAL;
+ return count;
+}
+
+static ssize_t damon_sysfs_stats_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 damon_sysfs_stats_sz_tried_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf, size_t count)
+{
+ struct damon_sysfs_stats *stats = container_of(kobj,
+ struct damon_sysfs_stats, kobj);
+ int err = kstrtoul(buf, 0, &stats->sz_tried);
+
+ if (err)
+ return -EINVAL;
+ return count;
+}
+
+static ssize_t damon_sysfs_stats_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 damon_sysfs_stats_nr_applied_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf, size_t count)
+{
+ struct damon_sysfs_stats *stats = container_of(kobj,
+ struct damon_sysfs_stats, kobj);
+ int err = kstrtoul(buf, 0, &stats->nr_applied);
+
+ if (err)
+ return -EINVAL;
+ return count;
+}
+
+static ssize_t damon_sysfs_stats_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 damon_sysfs_stats_sz_applied_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf, size_t count)
+{
+ struct damon_sysfs_stats *stats = container_of(kobj,
+ struct damon_sysfs_stats, kobj);
+ int err = kstrtoul(buf, 0, &stats->sz_applied);
+
+ if (err)
+ return -EINVAL;
+ return count;
+}
+
+static ssize_t damon_sysfs_stats_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 ssize_t damon_sysfs_stats_qt_exceeds_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf, size_t count)
+{
+ struct damon_sysfs_stats *stats = container_of(kobj,
+ struct damon_sysfs_stats, kobj);
+ int err = kstrtoul(buf, 0, &stats->qt_exceeds);
+
+ if (err)
+ return -EINVAL;
+ return count;
+}
+
+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(nr_tried, 0400, damon_sysfs_stats_nr_tried_show,
+ damon_sysfs_stats_nr_tried_store);
+
+static struct kobj_attribute damon_sysfs_stats_sz_tried_attr =
+ __ATTR(sz_tried, 0400, damon_sysfs_stats_sz_tried_show,
+ damon_sysfs_stats_sz_tried_store);
+
+static struct kobj_attribute damon_sysfs_stats_nr_applied_attr =
+ __ATTR(nr_applied, 0400, damon_sysfs_stats_nr_applied_show,
+ damon_sysfs_stats_nr_applied_store);
+
+static struct kobj_attribute damon_sysfs_stats_sz_applied_attr =
+ __ATTR(sz_applied, 0400, damon_sysfs_stats_sz_applied_show,
+ damon_sysfs_stats_sz_applied_store);
+
+static struct kobj_attribute damon_sysfs_stats_qt_exceeds_attr =
+ __ATTR(qt_exceeds, 0400, damon_sysfs_stats_qt_exceeds_show,
+ damon_sysfs_stats_qt_exceeds_store);
+
+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 struct kobj_type damon_sysfs_stats_ktype = {
+ .release = damon_sysfs_stats_release,
+ .sysfs_ops = &kobj_sysfs_ops,
+ .default_groups = damon_sysfs_stats_groups,
+};
+
/*
* watermarks directory
*/
@@ -666,6 +830,7 @@ struct damon_sysfs_scheme {
struct damon_sysfs_access_pattern *access_pattern;
struct damon_sysfs_quotas *quotas;
struct damon_sysfs_watermarks *watermarks;
+ struct damon_sysfs_stats *stats;
};
/* This should match with enum damos_action */
@@ -756,6 +921,22 @@ static int damon_sysfs_scheme_set_watermarks(struct damon_sysfs_scheme *scheme)
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_add_dirs(struct damon_sysfs_scheme *scheme)
{
int err;
@@ -769,8 +950,14 @@ static int damon_sysfs_scheme_add_dirs(struct damon_sysfs_scheme *scheme)
err = damon_sysfs_scheme_set_watermarks(scheme);
if (err)
goto put_quotas_access_pattern_out;
+ err = damon_sysfs_scheme_set_stats(scheme);
+ if (err)
+ goto put_watermarks_quotas_access_pattern_out;
return 0;
+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;
@@ -787,6 +974,7 @@ static void damon_sysfs_scheme_rm_dirs(struct damon_sysfs_scheme *scheme)
damon_sysfs_quotas_rm_dirs(scheme->quotas);
kobject_put(&scheme->quotas->kobj);
kobject_put(&scheme->watermarks->kobj);
+ kobject_put(&scheme->stats->kobj);
}
static ssize_t damon_sysfs_scheme_action_show(struct kobject *kobj,
@@ -2163,6 +2351,31 @@ static int damon_sysfs_turn_damon_off(struct damon_sysfs_kdamond *kdamond)
*/
}
+static int damon_sysfs_update_schemes_stats(struct damon_sysfs_kdamond *kdamond)
+{
+ struct damon_ctx *ctx = kdamond->damon_ctx;
+ struct damos *scheme;
+ int schemes_idx = 0;
+
+ if (!ctx)
+ return -EINVAL;
+ mutex_lock(&ctx->kdamond_lock);
+ damon_for_each_scheme(scheme, ctx) {
+ struct damon_sysfs_schemes *sysfs_schemes;
+ struct damon_sysfs_stats *sysfs_stats;
+
+ sysfs_schemes = kdamond->contexts->contexts_arr[0]->schemes;
+ 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;
+ }
+ mutex_unlock(&ctx->kdamond_lock);
+ return 0;
+}
+
static ssize_t damon_sysfs_kdamond_state_store(struct kobject *kobj,
struct kobj_attribute *attr, const char *buf, size_t count)
{
@@ -2176,6 +2389,8 @@ static ssize_t damon_sysfs_kdamond_state_store(struct kobject *kobj,
ret = damon_sysfs_turn_damon_on(kdamond);
else if (sysfs_streq(buf, "off"))
ret = damon_sysfs_turn_damon_off(kdamond);
+ else if (sysfs_streq(buf, "update_schemes_stats"))
+ ret = damon_sysfs_update_schemes_stats(kdamond);
else
ret = -EINVAL;
mutex_unlock(&damon_sysfs_lock);
--
2.17.1
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