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 4BFD33E1D1A; 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=kBY6Cc0gXuPYcvRQuYbmHT7X/61ggGSul/hrLfPTEzMybmfaUKEmQhyF6cpx1exZ93MVzU4gUIqD3nPH+a346aDpnx6amPPg5ROQdHLpYsFAWo+8EyL7B/opnDjyalPGS/IK5Bx4CNA2CBI3Ff/DxLaUK2alWO5No83uU86p5Rg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785163118; c=relaxed/simple; bh=d7pf79u6VeHtDpTchOv1ph3Cb9nyyNPcaDkMQnqw6mc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=hQWBg7yzcc7KqtjcBL9jLCXnNaPh69AeDZERqmTX9LlN5coZZj+N9u5CBDP7e1KaO3rPuoH6cF83dIysO753T86YtTmhq3NJUxLrjvUgFJirBYmJ3SQCR68qKOtKPi6YaQkR8vovykKYrm33CcCaohctUur+ENSlCOi+8Wu5xvQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Hlimw8ML; 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="Hlimw8ML" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DDD541F00A3A; Mon, 27 Jul 2026 14:38:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785163116; bh=75WNvMQ88+SBOSCD3WYFyt6Ye1FE/Gea2+Axargrbvo=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Hlimw8MLamfcIrZSFABY2AOxhNJvK+Env+BYkcO4rULDAAdIeojPvF1FmQ32BPadr HMr9O4rW3u4r7t7o+u2zTB9lSIBPJbVwEpQtICTiz1k5iFq7APR44bwDmgm26ApHD5 9lKuVZR+NKxj6P8FOBLqyiteVZ4bG0CGdPaajGIsMQqrIfXItUW3mEKE3QD1p23JlU nicHTogsY+aTI9CKkjNH+mhFCLpZNvvPL2mCSloNyLAqczFBKgYIHo6MPBewNJm/Nm 8ZRQcIwipNVNbfZ37s01mNOrJlm6OszYFpfZ3OKpRlXCtiTcuk7ZfQ37Ll7kfFJX3q twBw05Hkn7ncw== 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 10/17] mm/damon/sysfs: implement preps/nr_preps file Date: Mon, 27 Jul 2026 07:38:19 -0700 Message-ID: <20260727143829.86236-11-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 Implement nr_preps file under the preps directory. It will be evolved to be used for generating sub directories that will represent each probe preparation action. Signed-off-by: SJ Park --- mm/damon/sysfs.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 52 insertions(+), 1 deletion(-) diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c index e33070d2cbcc6..6d3ed80fb2eb1 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_preps { struct kobject kobj; + int nr; }; static struct damon_sysfs_preps *damon_sysfs_preps_alloc(void) @@ -763,12 +764,60 @@ static struct damon_sysfs_preps *damon_sysfs_preps_alloc(void) return kzalloc_obj(struct damon_sysfs_preps); } +static void damon_sysfs_preps_rm_dirs(struct damon_sysfs_preps *preps) +{ + preps->nr = 0; +} + +static int damon_sysfs_preps_add_dirs(struct damon_sysfs_preps *preps, + int nr_preps) +{ + preps->nr = nr_preps; + return 0; +} + +static ssize_t nr_preps_show(struct kobject *kobj, struct kobj_attribute *attr, + char *buf) +{ + struct damon_sysfs_preps *preps = container_of(kobj, + struct damon_sysfs_preps, kobj); + + return sysfs_emit(buf, "%d\n", preps->nr); +} + +static ssize_t nr_preps_store(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, size_t count) +{ + struct damon_sysfs_preps *preps; + int nr, err = kstrtoint(buf, 0, &nr); + + if (err) + return err; + if (nr < 0) + return -EINVAL; + + preps = container_of(kobj, struct damon_sysfs_preps, kobj); + + if (!mutex_trylock(&damon_sysfs_lock)) + return -EBUSY; + err = damon_sysfs_preps_add_dirs(preps, nr); + mutex_unlock(&damon_sysfs_lock); + if (err) + return err; + + return count; +} + static void damon_sysfs_preps_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_preps, kobj)); } +static struct kobj_attribute damon_sysfs_preps_nr_attr = + __ATTR_RW_MODE(nr_preps, 0600); + static struct attribute *damon_sysfs_preps_attrs[] = { + &damon_sysfs_preps_nr_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_preps); @@ -1150,8 +1199,10 @@ static int damon_sysfs_probe_add_dirs(struct damon_sysfs_probe *probe) static void damon_sysfs_probe_rm_dirs(struct damon_sysfs_probe *probe) { - if (probe->preps) + if (probe->preps) { + damon_sysfs_preps_rm_dirs(probe->preps); kobject_put(&probe->preps->kobj); + } if (probe->filters) { damon_sysfs_filters_rm_dirs(probe->filters); kobject_put(&probe->filters->kobj); -- 2.47.3