From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CC77F388E64; Mon, 27 Jul 2026 14:38:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785163118; cv=none; b=Fp+D/xkaxMZjzHUYTtaZFRwJKbT5ZnMi7y9NmRxBcSIxjK6MYaK6GawVyXdEhkH8z2ZLIOTc87laDCv9hFYUwTgTdEK+wJbfxWs2hN4hA81h/np3kkS+M3tC0KAN0ac04jM6g+2omzlkIbj2r0m+an4RN4Sf7KGgyXpY8hmQzIk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785163118; c=relaxed/simple; bh=iQN37EiMJKQfRi0zvOJAzGuqaK0m8+SKzubAtyWmfzo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=t2O5P+gDyVYtUoUH/RGyxveQfPjR/tkMPC150aHdW86tOYsaPKNCxlIXKr40JvWTzSXbGqRU8bC/BZmuyZ8EmjmgObjtChuQMteIF+tcXOQ9epEbsw3gE9ySizLWnOm8OkOtl58eIJRNGUWvaYs0jIrmX9SDsNRofRKIoFVxEcs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=avRc2BTk; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="avRc2BTk" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 818841F00ACA; Mon, 27 Jul 2026 14:38:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785163116; bh=pHE0coPeOqRqXIJwfVaYEOggVIIzf1bHhvcsS64ZKwU=; h=From:To:Cc:Subject:Date:In-Reply-To:References; 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> Precedence: bulk X-Mailing-List: damon@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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