[PATCH 02/20] mm/damon/sysfs-schemes: implement quota effective_bytes file

[SeongJae Park <sj@kernel.org>]

DAMON sysfs interface allows users to set two types of quotas, namely
time quota and size quota.  DAMOS converts time quota to a size quota
and use smaller one among the resulting two size quotas.  The resulting
effective size quota can be helpful for debugging and analysis, but not
exposed to the user.  The recently added feedback-driven quota
auto-tuning is making it even more mysterious.

Implement a DAMON sysfs interface read-only empty file, namely
'effective_bytes', under the quota goal DAMON sysfs directory.  It will
be extended to expose the effective quota to the end user.

Signed-off-by: SeongJae Park <sj@kernel.org>
---
 mm/damon/sysfs-schemes.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c
index f6c7f43f06cc..dd46b2db5455 100644
--- a/mm/damon/sysfs-schemes.c
+++ b/mm/damon/sysfs-schemes.c
@@ -1139,6 +1139,7 @@ struct damon_sysfs_quotas {
 	unsigned long ms;
 	unsigned long sz;
 	unsigned long reset_interval_ms;
+	unsigned long effective_sz;	/* Effective size quota in bytes */
 };
 
 static struct damon_sysfs_quotas *damon_sysfs_quotas_alloc(void)
@@ -1252,6 +1253,15 @@ static ssize_t reset_interval_ms_store(struct kobject *kobj,
 	return count;
 }
 
+static ssize_t effective_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->effective_sz);
+}
+
 static void damon_sysfs_quotas_release(struct kobject *kobj)
 {
 	kfree(container_of(kobj, struct damon_sysfs_quotas, kobj));
@@ -1266,10 +1276,14 @@ static struct kobj_attribute damon_sysfs_quotas_sz_attr =
 static struct kobj_attribute damon_sysfs_quotas_reset_interval_ms_attr =
 		__ATTR_RW_MODE(reset_interval_ms, 0600);
 
+static struct kobj_attribute damon_sysfs_quotas_effective_bytes_attr =
+		__ATTR_RO_MODE(effective_bytes, 0400);
+
 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,
+	&damon_sysfs_quotas_effective_bytes_attr.attr,
 	NULL,
 };
 ATTRIBUTE_GROUPS(damon_sysfs_quotas);
-- 
2.39.2