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 D708B38D3F8; Tue, 28 Jul 2026 04:12:56 +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=1785211979; cv=none; b=Mt6ukmTforFBe9HyJX/PzUTqdeGVcPLF491d02YrPXmBan8Uuz+vUxYdSV2kyLLUNuiyWCkEknc2m8ElygnbNsxjbB8f0iOjh0Q2i8XAACvEQjQFsiLadDOMCoW1u0F4EP1Z1VksQB3g1esjIPW14bMqZk6MbkutQDheUuxN9OM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785211979; c=relaxed/simple; bh=BVp9c5hdMqZK4f3puq6W6ae4o58hWsq3N5h/p4mXKxY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=aE0AL/YDO1KoZolZFsGxYud7TsabNNrzHR6EtkoRP8DJSAiSqwFD7+j+RkDtbhOQcYpKHtUhogHi62w/iGU2NqtnFgxjZ7skFvn6Bw2ogMkAvoAsCSgDrd9o10UyTjxpYeKUvnSHK5YJ2AClken7jrCHM4NoxY1GKF4fPlrHnaw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=UmuTp6v4; 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="UmuTp6v4" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5AC951F00ADE; Tue, 28 Jul 2026 04:12:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785211975; bh=S9iQ2CUL5Rc0Ka6RGKfOqCWa8tUB1pFEcM1janT09BA=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=UmuTp6v4hITtNNZ/2H7iOuVZknyvn6HDGNFqlPyxe+Sk39i7lAGnLEkOMq2XFHQwc dlOdghpSfQarFAowtN02qH9bLYT51RisZ0rDUEQcl7/cPzzttuR+/ny0DqokEaEHct pO6CskHRh4XOYrItT35/2HC1QnYcgbOmak1JVcN3TFXxLaN8afIgc/ZabAfZXITpxU /Dr5DrylOm80hZ7zW56r5wfcvFFeGSMwfbV9BmVazE7g5ObPul6k8UFSIthKn8DtAM fITqvPUW/5AnlitXk4T7uRbQIJS00xglF0O3TvOd4HzaM6gK4PwBzsttPNSRjr+UnI 3uLps0I0Er9bw== 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 v2.2 10/17] mm/damon/sysfs: implement preps/nr_preps file Date: Mon, 27 Jul 2026 21:12:31 -0700 Message-ID: <20260728041242.187380-11-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260728041242.187380-1-sj@kernel.org> References: <20260728041242.187380-1-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 66a3e7de869a8..38affef08d0fb 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