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b=JMoqbUJrzk2A7ET22ybfkRlQAv27xty8qK/utLpNogv4PXtneHfbWrkxHRqHp9rk7 mUb/95bx6TeZyekyAgb48ZXfybK55vmLlNyPgEfw6BJamenN8PpPWtGeYKGWbFRyDH 08Q9bMXLyO1a+lYqHAmnEAioLSqqwnnB4wuhLygYYIprlEzpccbCqpJOP35HkJG1vR L7uZpADib/u15jNK5eOib7CH88T+Neo0FfAAoMkajX+sT6r6ZCkrnzkP7qORwgFMfw ZiFSL2nSpVCoieHVPsx2VeJHcyKMhxJ26OZPiPioRqIzqv5DjGCvvNNAu/KG4UF5IF wbbxrsg6eizmA== 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 11/17] mm/damon/sysfs: implement probe prep directory Date: Sun, 26 Jul 2026 10:39:27 -0700 Message-ID: <20260726173935.94046-12-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260726173935.94046-1-sj@kernel.org> References: <20260726173935.94046-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: D8E14160009 X-Stat-Signature: cbz1wuwu74fsadftfnrftq59skckbj8u X-HE-Tag: 1785087588-439385 X-HE-Meta: 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 JNAbPGFw sHj/qq+BERig2Wb6Jcd6+xAH+m3rrLhdpuYGb/RKXA+HG9LqGasdSN+pe5JtaNSJu98/ZqOl3KBEK2IQBCuBWstqcd6NnGnQqo6I+Z59YmIS0CpuzoiT+OtvFbcBKuFdGAsd8yUEw6uTfQV0tMuWp1KbU0TYhoGjSvOyyIipJ4BbpctkdWTeoBin5AOz3v4YgJusMeh0C/ObWZGfncUiayYkASSOhWgvNde5KpILwkwvie4I= 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..e348c1feed1ad 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); + +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