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b=Cx0j7pIQ1CGMQtYnYVEl0J+ohRFAAu+8Mb2jpW4GzqMUoR4qA2k1X1Qm0pB2Lqp4Z zMUbb9SOteK3XgPqA9tjOSyvYvs5Xp0qC1xrimaFRB8dE5V30tJMKF754Sq//+hLdT tyzwKp0kPndobOlYF+9NSlmlzTTlUAoLIE8eaKug7AHLIXJSQu8PyBMqu4AhDdbTXk j4Aj6L3SoAbmmzCFzxtYxGeJG73fY4r/FZG7Jt8yOtxm51ef4ZRcATP9laS6OZueA3 jZYXTjk3lMgd57uSyI/ivs0qd1V6+WwAas6VsVevQ6PYc4fDl2Crr5/Nx2WuF+mOsL bQ8ZCz7fOZGUQ== 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 11/17] mm/damon/sysfs: implement probe prep directory Date: Sat, 25 Jul 2026 14:02:15 -0700 Message-ID: <20260725210225.129944-12-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260725210225.129944-1-sj@kernel.org> References: <20260725210225.129944-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: CBA38180007 X-Stat-Signature: 4tagace785jnfby5cezwir8t6uzsqnpk X-Rspam-User: X-HE-Tag: 1785013358-664101 X-HE-Meta: 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 jrsXCtOB Kf90W05JqqQad9IRtCy9fHvJskhSmqt4SKHjcSThqzNcCaNlw+v4MI/MZDDEVRGFbLMbv5//CKCvVwi9FpE2eFPX9Kktx7K4Q1zke+yq59/CiQd2XrA7+JEEVDO4U/m2AruQp5cXW+NnHRIGWhPLyY4YduOU4y3SuoGDspT3PG+THfExhMmp7BF/oPOrCSqMiJStr4Qhad78O1SlFrFTY8Bi6jhiMmGN4HsBEhhUD0eIPHPs= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Implement DAMON sysfs directory and files for specifying each probe prep action. Introduce only preparatory data structure and functions. The files are not really being created under the sysfs. Signed-off-by: SJ Park --- mm/damon/sysfs.c | 83 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 83 insertions(+) diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c index 6d3ed80fb2eb1..b15ec082109b7 100644 --- a/mm/damon/sysfs.c +++ b/mm/damon/sysfs.c @@ -750,6 +750,89 @@ static const struct kobj_type damon_sysfs_intervals_ktype = { .default_groups = damon_sysfs_intervals_groups, }; +/* + * prep directory + */ + +struct damon_sysfs_prep { + struct kobject kobj; + enum damon_prep_action action; +}; + +struct damon_sysfs_prep_action_name { + enum damon_prep_action action; + char *name; +}; + +static const struct damon_sysfs_prep_action_name +damon_sysfs_prep_action_names[] = { + { + .action = DAMON_PREP_SET_PGIDLE, + .name = "set_pgidle", + }, +}; + +static ssize_t prep_action_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct damon_sysfs_prep *prep = container_of(kobj, + struct damon_sysfs_prep, kobj); + int i; + + for (i = 0; i < ARRAY_SIZE(damon_sysfs_prep_action_names); i++) { + const struct damon_sysfs_prep_action_name *action_name; + + action_name = &damon_sysfs_prep_action_names[i]; + if (action_name->action == prep->action) + return sysfs_emit(buf, "%s\n", action_name->name); + } + return -EINVAL; +} + +static ssize_t prep_action_store(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, size_t count) +{ + struct damon_sysfs_prep *prep = container_of(kobj, + struct damon_sysfs_prep, kobj); + ssize_t ret = -EINVAL; + int i; + + for (i = 0; i < ARRAY_SIZE(damon_sysfs_prep_action_names); i++) { + const struct damon_sysfs_prep_action_name *action_name; + + action_name = &damon_sysfs_prep_action_names[i]; + if (sysfs_streq(buf, action_name->name)) { + prep->action = action_name->action; + ret = count; + break; + } + } + return ret; +} + +static void damon_sysfs_prep_release(struct kobject *kobj) +{ + struct damon_sysfs_prep *prep = container_of(kobj, + struct damon_sysfs_prep, kobj); + + kfree(prep); +} + +static struct kobj_attribute damon_sysfs_prep_prep_action_attr = + __ATTR_RW_MODE(prep_action, 0600); + +static struct attribute *damon_sysfs_prep_attrs[] = { + &damon_sysfs_prep_prep_action_attr.attr, + NULL, +}; +ATTRIBUTE_GROUPS(damon_sysfs_prep); + +static const struct kobj_type damon_sysfs_prep_ktype = { + .release = damon_sysfs_prep_release, + .sysfs_ops = &kobj_sysfs_ops, + .default_groups = damon_sysfs_prep_groups, +}; + /* * preps directory */ -- 2.47.3