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b=avRc2BTk7qLcWSdhnUZClkn3j6ELaJnVwWq1fAvtLsuKbFCRxd1qBLvESlHYZUviD fPCl7uO+u3M/eV4GeraIVYIN1oQGJBkptEQpRWrPJ7M/FDzCZ5HPCXEOzJtf2tVzky BBHeSul42z/8+EPdwaVmHg/Ci9c/rcI9TX6mc7OVWBROIasNYaP9ps7nbqj+7xuYRv X3NBz28DbIEvSGb9rfdovrMY0O1gnMheKoEeM/3zkqp7J9a8OPzVyf4fKcFYNpt5IL UuPSzeUCrye6cqoJtb2P40M6EiS+h/wT/eUBjeFnxdaXPYrG2SqFHgIDN+LWx4h3tm Qs7r7fPIE+lWw== 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 v2.1 12/17] mm/damon/sysfs: implement prep_action file Date: Mon, 27 Jul 2026 07:38:21 -0700 Message-ID: <20260727143829.86236-13-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260727143829.86236-1-sj@kernel.org> References: <20260727143829.86236-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 6C3EB4000C X-Stat-Signature: sqxfdx1tbfz9zyatxg796dwbqztxrxbg X-HE-Tag: 1785163117-917976 X-HE-Meta: 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 CnA71nNf 0CIEHk0HrjtoihhTrWl1fLfXQp/gAl3840pp6COFEuZm0gwjURrQ+NuAsL3K6O6AtvfPrssd4fgPNmrtW5yMvj8QlEJuTC71aoWqVlsQmPIX4FfxNbsYHE16qIOYNzKfTyK2djZqXtOTYNMZ4oeyGWlUkrsjGP7u0tOxLm1RKTX6XApG+hemxFyltbhj3Nn4vZE9FrsONy0F663N5231k2Ku3WA9MK+E6j4t9ao3GWSgCCIr90ydvhEUlhdpt3ETdVIGHykEf6+rC8kPjUdReD8VEjA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Add a file named prep_action under the prep directory. It represents the corresponding probe preparation action. Signed-off-by: SJ Park --- mm/damon/sysfs.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 57 insertions(+) diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c index 2ec33280a7a83..0173f37fdbf3d 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_prep { struct kobject kobj; + enum damon_prep_action action; }; static struct damon_sysfs_prep *damon_sysfs_prep_alloc(void) @@ -765,9 +766,61 @@ static struct damon_sysfs_prep *damon_sysfs_prep_alloc(void) prep = kzalloc_obj(struct damon_sysfs_prep); if (!prep) return prep; + prep->action = DAMON_PREP_SET_PGIDLE; return prep; } +struct damon_sysfs_prep_action_name { + const enum damon_prep_action action; + const 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, @@ -776,7 +829,11 @@ static void damon_sysfs_prep_release(struct kobject *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); -- 2.47.3