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b=HIoivf4CwD93oxJWrX+WLG0p+JKxKkSR3kRkADy1Vt2JJFx/ckAkAVhXpV3Ck7etV RNni5Ecb6a8u4kHzhNk3jCAAXdejXbJsBOgahClUzoydn0YhcqISFfDmL6EvUTap59 iQ0VCK8/Hbb8bOvvrSOb3pvwiTESRpBWTPYFon1ZM9o6kBTM/hiX9SEswXA3rNm5L7 n46tFb1fZcf8zposGXhAkZ3BALNJ3EhaqiACOdTduPB76TSPz2ndPjMJ/xpiYc0YT8 hNPw9wRoiQpOvigJ2LKdzPwafUKjCCjQvr/wuFOPiK6SM56Pw2ozcV/eELuyQ5fM3y LEahb4wirpCYg== From: SeongJae Park To: Cc: SeongJae Park , Andrew Morton , damon@lists.linux.dev, kernel-team@meta.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH 04/11] mm/damon/sysfs-schemes: implement path file under quota goal directory Date: Thu, 19 Jun 2025 15:00:16 -0700 Message-Id: <20250619220023.24023-5-sj@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250619220023.24023-1-sj@kernel.org> References: <20250619220023.24023-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 21F08180012 X-Stat-Signature: oy47py1bk96b5i4knde9gaiakausjn47 X-Rspam-User: X-HE-Tag: 1750370433-344226 X-HE-Meta: U2FsdGVkX19oqGlTUJmIgxoS3nSHBV99tr7VZtmx9kQMGf9T3QujBg77c7u31yWuPlk8ArcQulbJ2BbKw/queovPXXUkgT9/WsxTgYXhiRFYKRvNlEOp4ttm2IKA3b58vwCnpnwDhOQUuIr3wBb9GZJz/cuwc6gaYQGXteUK0lQLC+bxEx+xxjajrtxfvDznpYNYWJf+O+sx+Mv8VpuaSapR0orbFIDMi4YuQ1MsJjpDsLKdIkQg9jm8mDtdM4MrAgjGGQ2dY+QuBKjr9E94NwFwr/MuI1HCv8ELFVjTTVZe93HMEqmqdFjumgzs5yb3kAuxZ6BTEI6LaTV3XMihuwzw1HleQSxK0BuIOAuWz/udTJjFuUpz9nXjE2SkVyZMXyj/Xx7nUfr0QHvu9qjZZfXhi72XphBW92Fn1GEgN8Y/DVN+m3Ohh7baHHVbB1eTMHSehiyRjACL9o1jB5gqQdTCXYRSzV9sumuL5jbCEiv5tJFBJxttGK/D+B5nyk0n2mxu1V3hXcgjGPaYAuWNg3EqEy8k2mtvtTvs0Tq9Bi89igcGvnr4oHEVjsgibJCxvSZVNRp1ZKDCNs8gmFWV+PGPvjiMsW4l3ozu0MdntBeffARH+19AZ0WLnZL7l5jJTVsKIeYGTtmhrQ/hCnV9rUVKFAq0DULIgWW3Faik023uJSgN8cJK6QoUUisvNAPSc8vKn1bRiGCMarD2qUXeZhYFgpaXPckVHezBbZ0hlvFUMsY+iJPFKFP8pjTTPhxqMcwyDgC9Zhb6s1yaoeUpqsvPUj5NKL9vhZQHhi6P+RxwLsisLQxZLfW8KeZqVTb84ETOCrMvtv0HovYpa2+acCRnxWWg11VJwd4EsDyWHg3Eo8B97UFOgrzJytMhT1Qe2xrnaKL+4rdl1IvEyIqXB1PTh4eyJC3ZPuzLzuld/muC4hSByvo0vTPgpSeleNZxOrh8OGTe+0ngzt3iLT2 STN0StFz XNHf4qR9xGc0xYrpzWIzOhDkG8ecGvoqD3HR9JLFlCOYu9T1t4jh8s3qNMh/ujcg+CnLVoPu3WBLzJy/c+v2ApyEzFTZmZVYb+c97aPiqSxkuwxvQ7ECTgv5fdkHAYAnEJHo8LVS7yjkOp0LfDw81GJaL972f+JzQZhJJ+sh5HZlkCf4qDpsPwcMZr27Yf33EWOEBxmhzTBHUlFnXcLl3e8fvQdtnVGsOE2w67Rxl/7BmRfM= 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 4805761d9127..4a340baa72a4 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) @@ -1132,10 +1133,39 @@ 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 = @@ -1150,11 +1180,15 @@ 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); -- 2.39.5