Commit c41e253a authored by SeongJae Park's avatar SeongJae Park Committed by Andrew Morton
Browse files

mm/damon/sysfs-schemes: implement path file under quota goal directory 

Add a DAMOS sysfs file for specifying the cgroup of the interest for
DAMOS_QUOTA_NODE_MEMCG_USED_BP.

Link: https://lkml.kernel.org/r/20251017212706.183502-5-sj@kernel.org


Signed-off-by: default avatarSeongJae Park <sj@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent b74a120b

mm/damon/sysfs-schemes.c

+36 −2
Original line number Diff line number Diff line
@@ -999,6 +999,7 @@ struct damos_sysfs_quota_goal { 
	unsigned long target_value;

	unsigned long current_value;

	int nid;

	char *path;

};



static struct damos_sysfs_quota_goal *damos_sysfs_quota_goal_alloc(void)
@@ -1128,10 +1129,39 @@ static ssize_t nid_store(struct kobject *kobj, 
	return err ? err : count;

}



static ssize_t path_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, "%s\n", goal->path ? goal->path : "");

}



static ssize_t path_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);

	char *path = kmalloc_array(size_add(count, 1), sizeof(*path),

				   GFP_KERNEL);



	if (!path)

		return -ENOMEM;



	strscpy(path, buf, count + 1);

	kfree(goal->path);

	goal->path = path;

	return 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));

	struct damos_sysfs_quota_goal *goal = container_of(kobj,

			struct damos_sysfs_quota_goal, kobj);



	kfree(goal->path);

	kfree(goal);

}



static struct kobj_attribute damos_sysfs_quota_goal_target_metric_attr =
@@ -1146,11 +1176,15 @@ static struct kobj_attribute damos_sysfs_quota_goal_current_value_attr = 
static struct kobj_attribute damos_sysfs_quota_goal_nid_attr =

		__ATTR_RW_MODE(nid, 0600);



static struct kobj_attribute damos_sysfs_quota_goal_path_attr =

		__ATTR_RW_MODE(path, 0600);



static struct attribute *damos_sysfs_quota_goal_attrs[] = {

	&damos_sysfs_quota_goal_target_metric_attr.attr,

	&damos_sysfs_quota_goal_target_value_attr.attr,

	&damos_sysfs_quota_goal_current_value_attr.attr,

	&damos_sysfs_quota_goal_nid_attr.attr,

	&damos_sysfs_quota_goal_path_attr.attr,

	NULL,

};

ATTRIBUTE_GROUPS(damos_sysfs_quota_goal);