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b=iVRtgB+ZiN4XfZsXsPLqj8yZhnIbqlQOLd2cgR5NKUfC0oQjnbpwIZZ/sFpRaaNpU ImLNc7urtvZEttLUPx5rz3Dpa1Pw9nHvgZpOcLRG2vvhY7wvE/qT7cZJtaxnDs2j6c FvgP1ZCyGkp0N1tRP96OQU0qYNSMKbhlsHGR1/5UO69FgkP6oMQ1UrCGaJzWQUmX7a 7cqNMb7TcykikRA9VWs8l+7FjUXarRT6aPKAL3F9GldVQOZ4wJJvohn/WCi6s450qX LNsNVSOv4+zFHPPWl6jcrnLq9WfGxK7E8zeHeqZeeH3YohIkanM3Oe59m3nvzlxm6H gMd3pR4QJQkUA== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 04/10] mm/damon/sysfs-schemes: implement path file under quota goal directory Date: Fri, 17 Oct 2025 14:26:56 -0700 Message-ID: <20251017212706.183502-5-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251017212706.183502-1-sj@kernel.org> References: <20251017212706.183502-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: F218D40004 X-Stat-Signature: cps5t6ak6ya4di1shm61wmqtb1au8wyk X-Rspam-User: X-HE-Tag: 1760736435-501083 X-HE-Meta: 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 tjfvvemE gaRj1xP0coksJIWXaCpJvGD4QNnXJSMzXMvtZPvWLXnJpBBqoWtK+5UPjtoqqCZLcP+CD7Usd4rDtSZ594dG8p0gKuHF2u2V6fp10yYP2nQFbpnCoVNhKCIkUmn2w3CoWJ+OZCtMbjsWQIluelpisd4nW4PoKHb/yqIJ/fI/o4kR9kfCYSqIjITk16f4uXmwteNed X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Add a DAMOS sysfs file for specifying the cgroup of the interest for DAMOS_QUOTA_NODE_MEMCG_USED_BP. Signed-off-by: SeongJae Park --- mm/damon/sysfs-schemes.c | 38 ++++++++++++++++++++++++++++++++++++-- 1 file changed, 36 insertions(+), 2 deletions(-) diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c index 6536f16006c9..2c440a2b80e6 100644 --- a/mm/damon/sysfs-schemes.c +++ b/mm/damon/sysfs-schemes.c @@ -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); -- 2.47.3