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mm/damon/sysfs-schemes: implement file for quota goal nid parameter

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DAMOS_QUOTA_NODE_MEM_{USED,FREE}_BP DAMOS quota goal metrics require the
node id parameter.  However, there is no DAMON user ABI for setting it. 
Implement a DAMON sysfs file for that with name 'nid', under the quota
goal directory.

Link: https://lkml.kernel.org/r/20250420194030.75838-3-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Yunjeong Mun <yunjeong.mun@sk.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park 2025-04-20 12:40:25 -07:00 committed by Andrew Morton
parent 0e1c773b50
commit 0fbd59379d
1 changed files with 27 additions and 0 deletions
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27
mm/damon/sysfs-schemes.c
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@ -936,6 +936,7 @@ struct damos_sysfs_quota_goal {
enum damos_quota_goal_metric metric;
unsigned long target_value;
unsigned long current_value;
int nid;
};
/* This should match with enum damos_action */
@ -1016,6 +1017,28 @@ static ssize_t current_value_store(struct kobject *kobj,
return err ? err : count;
}
static ssize_t nid_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);
/* todo: return error if the goal is not using nid */
return sysfs_emit(buf, "%d\n", goal->nid);
}
static ssize_t nid_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 = kstrtoint(buf, 0, &goal->nid);
/* 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 */
@ -1031,10 +1054,14 @@ static struct kobj_attribute damos_sysfs_quota_goal_target_value_attr =
static struct kobj_attribute damos_sysfs_quota_goal_current_value_attr =
__ATTR_RW_MODE(current_value, 0600);
static struct kobj_attribute damos_sysfs_quota_goal_nid_attr =
__ATTR_RW_MODE(nid, 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,
NULL,
};
ATTRIBUTE_GROUPS(damos_sysfs_quota_goal);