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b=t7sLBbkIOm43qO3O7T09C0xNfgkehYwnbWLABepbu5er81+Uv0T6aeWgA7jvDoG22 xnmmPma69N0hJG/ABB7sZ9bDgoVFB0BH95HkfjudigdbF0FCMcKmbA66EiggkXzZ7/ Df8rXsPrHeWTBCh6E1AxZhsf2RyRXZKyxXF3p0PrE/VuAOhLd8Ukk+pWt3xdgWuj9P +/mi+D1mKP2jA4Y6ed2tAlXJiAIdxKJaKbfFMGQXTdGO+NeUNpW2mrXiS1iPr+SG7i +tVR1A5gWWw0xsquh2zJe5KiYi95zvnd6rPEscl0nIBGPhwh4gh35jXHCIS+pZFhru CVt8gTD4Ugzeg== From: SeongJae Park To: Andrew Morton Cc: SeongJae Park , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 24/28] mm/damon/sysfs: add filters//path file Date: Mon, 18 May 2026 16:41:12 -0700 Message-ID: <20260518234119.97569-25-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260518234119.97569-1-sj@kernel.org> References: <20260518234119.97569-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: 2670C1C000D X-Rspamd-Server: rspam04 X-Stat-Signature: wpnzmcokpcf7abb346rd8c4dxeuxypqj X-HE-Tag: 1779147693-387793 X-HE-Meta: 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 HVe+EPnj y61LguPw6n0gBXXjLZSpLA5ibfzcr0KNYKh6ftPtqF6jysdpi4kGYWEDR67PmVCV34A8pp9s7LQyhrxlfmis7TldM/V0HL4vF0GF11Nd31O8GxUL/WlUlu4lpGZ73neNXBcQzuh+ZI3ddSB7S8tBa8hXfNp7IgYr8r2EOpwH52PbOVssACps+Q63UIRccpzsw1awm Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Introduce a new DAMON sysfs file for letting users setup the target memory cgroup of the belonging memory cgroup attribute monitoring. The file is named 'path', located under the probe filter directory. Users can set the target memory cgroup by writing the path to the memory cgroup from the cgroup mount point to the file. Signed-off-by: SeongJae Park --- mm/damon/sysfs.c | 44 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c index eeb7fdd030cf0..0f6379caf4816 100644 --- a/mm/damon/sysfs.c +++ b/mm/damon/sysfs.c @@ -756,6 +756,7 @@ struct damon_sysfs_filter { enum damon_filter_type type; bool matching; bool allow; + char *path; }; static struct damon_sysfs_filter *damon_sysfs_filter_alloc(void) @@ -774,6 +775,10 @@ damon_sysfs_filter_type_names[] = { .type = DAMON_FILTER_TYPE_ANON, .name = "anon", }, + { + .type = DAMON_FILTER_TYPE_MEMCG, + .name = "memcg", + }, }; static ssize_t type_show(struct kobject *kobj, @@ -862,11 +867,46 @@ static ssize_t allow_store(struct kobject *kobj, return count; } +static ssize_t path_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct damon_sysfs_filter *filter = container_of(kobj, + struct damon_sysfs_filter, kobj); + int len; + + if (!mutex_trylock(&damon_sysfs_lock)) + return -EBUSY; + len = sysfs_emit(buf, "%s\n", filter->path ? filter->path : ""); + mutex_unlock(&damon_sysfs_lock); + return len; +} + +static ssize_t path_store(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, size_t count) +{ + struct damon_sysfs_filter *filter = container_of(kobj, + struct damon_sysfs_filter, kobj); + char *path = kmalloc_objs(*path, size_add(count, 1)); + + if (!path) + return -ENOMEM; + strscpy(path, buf, size_add(count, 1)); + if (!mutex_trylock(&damon_sysfs_lock)) { + kfree(path); + return -EBUSY; + } + kfree(filter->path); + filter->path = path; + mutex_unlock(&damon_sysfs_lock); + return count; +} + static void damon_sysfs_filter_release(struct kobject *kobj) { struct damon_sysfs_filter *filter = container_of(kobj, struct damon_sysfs_filter, kobj); + kfree(filter->path); kfree(filter); } @@ -879,10 +919,14 @@ static struct kobj_attribute damon_sysfs_filter_matching_attr = static struct kobj_attribute damon_sysfs_filter_allow_attr = __ATTR_RW_MODE(allow, 0600); +static struct kobj_attribute damon_sysfs_filter_path_attr = + __ATTR_RW_MODE(path, 0600); + static struct attribute *damon_sysfs_filter_attrs[] = { &damon_sysfs_filter_type_attr.attr, &damon_sysfs_filter_matching_attr.attr, &damon_sysfs_filter_allow_attr.attr, + &damon_sysfs_filter_path_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_filter); -- 2.47.3