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b=UmuTp6v4hITtNNZ/2H7iOuVZknyvn6HDGNFqlPyxe+Sk39i7lAGnLEkOMq2XFHQwc dlOdghpSfQarFAowtN02qH9bLYT51RisZ0rDUEQcl7/cPzzttuR+/ny0DqokEaEHct pO6CskHRh4XOYrItT35/2HC1QnYcgbOmak1JVcN3TFXxLaN8afIgc/ZabAfZXITpxU /Dr5DrylOm80hZ7zW56r5wfcvFFeGSMwfbV9BmVazE7g5ObPul6k8UFSIthKn8DtAM fITqvPUW/5AnlitXk4T7uRbQIJS00xglF0O3TvOd4HzaM6gK4PwBzsttPNSRjr+UnI 3uLps0I0Er9bw== From: SJ Park To: Cc: SJ Park , Andrew Morton , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH v2.2 10/17] mm/damon/sysfs: implement preps/nr_preps file Date: Mon, 27 Jul 2026 21:12:31 -0700 Message-ID: <20260728041242.187380-11-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260728041242.187380-1-sj@kernel.org> References: <20260728041242.187380-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 3A39F1C0006 X-Stat-Signature: h96ncfaxn3h4enykc5j15p6ncuyaas56 X-Rspam-User: X-HE-Tag: 1785211976-165612 X-HE-Meta: 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 hqBPw2OO sQXo+pR/II7LgY5Hk7xt9WztbGyhuffXbJ4zbEi9Af/QkHAONP0xfWJwqdfgkdTyVbzHr8uS4RCMoZnVAC+kHTZnqYyeHRC6QJB1e8gvVrWPudXz30wI8uI/sNNVIOAxlZiIgyOudjRBPil95bBz/6t8n0iq2QSJqcz/aGiihb3GWMgMdYMdWniphg4cg9Rrv40kxgZcpjxLYMhEecnp7opu2yXjTbK32n1KRnJgRDUxlrjtFy8EJ8hoaQLnN2qwijVy5DwaUt+NtEHneHaDbCygaRg== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Implement nr_preps file under the preps directory. It will be evolved to be used for generating sub directories that will represent each probe preparation action. Signed-off-by: SJ Park --- mm/damon/sysfs.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 52 insertions(+), 1 deletion(-) diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c index 66a3e7de869a8..38affef08d0fb 100644 --- a/mm/damon/sysfs.c +++ b/mm/damon/sysfs.c @@ -756,6 +756,7 @@ static const struct kobj_type damon_sysfs_intervals_ktype = { struct damon_sysfs_preps { struct kobject kobj; + int nr; }; static struct damon_sysfs_preps *damon_sysfs_preps_alloc(void) @@ -763,12 +764,60 @@ static struct damon_sysfs_preps *damon_sysfs_preps_alloc(void) return kzalloc_obj(struct damon_sysfs_preps); } +static void damon_sysfs_preps_rm_dirs(struct damon_sysfs_preps *preps) +{ + preps->nr = 0; +} + +static int damon_sysfs_preps_add_dirs(struct damon_sysfs_preps *preps, + int nr_preps) +{ + preps->nr = nr_preps; + return 0; +} + +static ssize_t nr_preps_show(struct kobject *kobj, struct kobj_attribute *attr, + char *buf) +{ + struct damon_sysfs_preps *preps = container_of(kobj, + struct damon_sysfs_preps, kobj); + + return sysfs_emit(buf, "%d\n", preps->nr); +} + +static ssize_t nr_preps_store(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, size_t count) +{ + struct damon_sysfs_preps *preps; + int nr, err = kstrtoint(buf, 0, &nr); + + if (err) + return err; + if (nr < 0) + return -EINVAL; + + preps = container_of(kobj, struct damon_sysfs_preps, kobj); + + if (!mutex_trylock(&damon_sysfs_lock)) + return -EBUSY; + err = damon_sysfs_preps_add_dirs(preps, nr); + mutex_unlock(&damon_sysfs_lock); + if (err) + return err; + + return count; +} + static void damon_sysfs_preps_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_preps, kobj)); } +static struct kobj_attribute damon_sysfs_preps_nr_attr = + __ATTR_RW_MODE(nr_preps, 0600); + static struct attribute *damon_sysfs_preps_attrs[] = { + &damon_sysfs_preps_nr_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_preps); @@ -1150,8 +1199,10 @@ static int damon_sysfs_probe_add_dirs(struct damon_sysfs_probe *probe) static void damon_sysfs_probe_rm_dirs(struct damon_sysfs_probe *probe) { - if (probe->preps) + if (probe->preps) { + damon_sysfs_preps_rm_dirs(probe->preps); kobject_put(&probe->preps->kobj); + } if (probe->filters) { damon_sysfs_filters_rm_dirs(probe->filters); kobject_put(&probe->filters->kobj); -- 2.47.3