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 EBD863D9DAC; Tue, 1 Sep 2026 04:34:29 +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=1788237271; cv=none; b=lWDEbQT+cFK+MBguT4cjhOu7R4jF7kZiGRxN7oVm6fbO3ppGXuI59tIo6kVNv8d9beQN8EijD7WegVBOrlZ8KDvz0a2FGnHYG/2hyNUd/GG8PQYqSCCRvIkblVMcKPsjtEJ3jRNv4+xod4t3OnvLCWyq5ORvT5JHUqCUsE7Mm2g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788237271; c=relaxed/simple; bh=FA78w4w9pzU+JImx6UmQnQBs3uKYgYRJIYmgiiq2ePA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=AJrdI91MSbCnv1R7h16Lhjw9Gzh3NJi7zEsfcIMPEa6fjM7ppgeigQwIV9NLY82YMOzXbxrhT4QiHyARB8EhwfHuUGy1GpMzgjpLajFNxogl3H8bcs49fiGs6Xdtqm0/ZFxurFkM13CnmPosmYfpE02JQuULHBFxDFolaYkEesI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=oM3BnEaq; 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="oM3BnEaq" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8159B1F00A3E; Tue, 1 Sep 2026 04:34:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788237269; bh=Rl5ADA+9J/l2w2quHKWsOoHjOvreI5jvhgmI+c48UlQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=oM3BnEaqrscKBNF8aZ7Qv4bUFnq1511x+PkpIIIS2REY45nbPMpOv8JEeUgh4zEhC p55twps4xZ2Avb3RNPYl4LpuDOS2MDB54HPkJfmsjNlI3BvGUfs2KkrGa9TEXZUZuZ qSNHp5Pn/0mqEy4Itdm4PnEffr4tg0pa+EyrR/isB/V9XN4YEzyUY4MjgnFPs9j6IN U6dSqTzCDzJH/omWZUKusLgU+laMJp9DTYqQ8N8mkiUiDDwGr2SURXd4ypyUJhdqHb VVVNqZCYxVf8l89sUPc7pXCRDOtNWaB87mxS898ThR5m8oEafUv2I9NERjimMWOcyT RrgqxZIGUbX3A== From: SJ Park To: Andrew Morton Cc: SJ Park , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 12/17] mm/damon/sysfs: implement prep_action file Date: Mon, 31 Aug 2026 21:34:08 -0700 Message-ID: <20260901043417.2165-13-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260901043417.2165-1-sj@kernel.org> References: <20260901043417.2165-1-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 3749abb781566..1ecf194f71ddb 100644 --- a/mm/damon/sysfs.c +++ b/mm/damon/sysfs.c @@ -755,6 +755,7 @@ 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) @@ -764,9 +765,61 @@ 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, @@ -775,7 +828,11 @@ 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