From nobody Fri Dec 19 13:31:37 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 CE29C31AF17; Mon, 8 Dec 2025 06:30:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765175419; cv=none; b=k8UdxgxDVunLXq8JewZKAMP2OS7UFatE7fuO2s3WRKQEPM8dEJNyEl/68kRpklxPFUznjo3l7+sodG+WE7aJievdI7MyOQRg0u0f1FIucEIUTiNPQ4jjiWWoLZYOdUDoHzOdgS0alb2KTGcfwKzB7bCXgxkjSs7K2TMLYr2CHWU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765175419; c=relaxed/simple; bh=fqtI2Gnz07OVYPT/2oX+SDTbNLPGFodcuU+kQDn13Ek=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=F+A1iLvP9GcxjOfzmv7C7disTc2Z/MUg9Yy1ccm1OlP9hB0668xhSvgJHhhsdgly837Yw5ssSVJ1GgMg8GApdmH4RSZn7YCwhN9wZI5kUKxy9YIMu0DOaqxmd3XgRLJb1F8ihcJcF2Boiein9odO1RXG0uXll/85Fsp35b9RRO0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=diF8S5Xl; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="diF8S5Xl" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 29D0BC19421; Mon, 8 Dec 2025 06:30:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1765175419; bh=fqtI2Gnz07OVYPT/2oX+SDTbNLPGFodcuU+kQDn13Ek=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=diF8S5Xl62t4a4nrz6s9jCM+NbKUjbmQqLXN6ILr6Xw7ZT9FjwflJzMxaRNvwJ3xS 0qJlyuAKQSwruTpl/XCWLD27ziMxSuAnNrATHYkI6vMUm+Pts1Ap79LBGceoNAa04F RnjRiX+z4WCT5BINlgRz623mMcThFeb3xcqQGAcAdB112HUr40JjaHQkUj9NqBW8c9 R+OdqQeNs5DTvdLmzFmUorj1/3LKOz8wpb4tvhZ6JzJKvMm+O9ymy4c6YfcIM5cawr 3bdgx3SBR+sHWHr962QlfwlxxxUzZ5H2wAPSQhyJrBKurxOcZR/dWoQu3bBKB+cO1p IXPyl/gyERCXQ== From: SeongJae Park To: Cc: SeongJae Park , Andrew Morton , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH v3 20/37] mm/damon/sysfs: implement sample filter directory Date: Sun, 7 Dec 2025 22:29:24 -0800 Message-ID: <20251208062943.68824-21-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20251208062943.68824-1-sj@kernel.org> References: <20251208062943.68824-1-sj@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Implement sysfs directory for setting individual DAMON sample filters. Signed-off-by: SeongJae Park --- mm/damon/sysfs.c | 122 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 122 insertions(+) diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c index 4208fed2b8df..ba0c76c1300c 100644 --- a/mm/damon/sysfs.c +++ b/mm/damon/sysfs.c @@ -749,12 +749,46 @@ static const struct kobj_type damon_sysfs_intervals_k= type =3D { .default_groups =3D damon_sysfs_intervals_groups, }; =20 +/* + * access check report filter directory + */ + +struct damon_sysfs_sample_filter { + struct kobject kobj; +}; + +static struct damon_sysfs_sample_filter *damon_sysfs_sample_filter_alloc(v= oid) +{ + return kzalloc(sizeof(struct damon_sysfs_sample_filter), GFP_KERNEL); +} + +static void damon_sysfs_sample_filter_release(struct kobject *kobj) +{ + struct damon_sysfs_sample_filter *filter =3D container_of(kobj, + struct damon_sysfs_sample_filter, kobj); + + kfree(filter); +} + +static struct attribute *damon_sysfs_sample_filter_attrs[] =3D { + NULL, +}; +ATTRIBUTE_GROUPS(damon_sysfs_sample_filter); + +static const struct kobj_type damon_sysfs_sample_filter_ktype =3D { + .release =3D damon_sysfs_sample_filter_release, + .sysfs_ops =3D &kobj_sysfs_ops, + .default_groups =3D damon_sysfs_sample_filter_groups, +}; + /* * access check report filters directory */ =20 struct damon_sysfs_sample_filters { struct kobject kobj; + struct damon_sysfs_sample_filter **filters_arr; + int nr; }; =20 static struct damon_sysfs_sample_filters * @@ -763,12 +797,99 @@ damon_sysfs_sample_filters_alloc(void) return kzalloc(sizeof(struct damon_sysfs_sample_filters), GFP_KERNEL); } =20 +static void damon_sysfs_sample_filters_rm_dirs( + struct damon_sysfs_sample_filters *filters) +{ + struct damon_sysfs_sample_filter **filters_arr =3D filters->filters_arr; + int i; + + for (i =3D 0; i < filters->nr; i++) + kobject_put(&filters_arr[i]->kobj); + filters->nr =3D 0; + kfree(filters_arr); + filters->filters_arr =3D NULL; +} + +static int damon_sysfs_sample_filters_add_dirs( + struct damon_sysfs_sample_filters *filters, int nr_filters) +{ + struct damon_sysfs_sample_filter **filters_arr, *filter; + int err, i; + + damon_sysfs_sample_filters_rm_dirs(filters); + if (!nr_filters) + return 0; + + filters_arr =3D kmalloc_array(nr_filters, sizeof(*filters_arr), + GFP_KERNEL | __GFP_NOWARN); + if (!filters_arr) + return -ENOMEM; + filters->filters_arr =3D filters_arr; + + for (i =3D 0; i < nr_filters; i++) { + filter =3D damon_sysfs_sample_filter_alloc(); + if (!filter) { + damon_sysfs_sample_filters_rm_dirs(filters); + return -ENOMEM; + } + + err =3D kobject_init_and_add(&filter->kobj, + &damon_sysfs_sample_filter_ktype, + &filters->kobj, "%d", i); + if (err) { + kobject_put(&filter->kobj); + damon_sysfs_sample_filters_rm_dirs(filters); + return err; + } + + filters_arr[i] =3D filter; + filters->nr++; + } + return 0; +} + +static ssize_t nr_filters_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct damon_sysfs_sample_filters *filters =3D container_of(kobj, + struct damon_sysfs_sample_filters, kobj); + + return sysfs_emit(buf, "%d\n", filters->nr); +} + +static ssize_t nr_filters_store(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, size_t count) +{ + struct damon_sysfs_sample_filters *filters; + int nr, err =3D kstrtoint(buf, 0, &nr); + + if (err) + return err; + if (nr < 0) + return -EINVAL; + + filters =3D container_of(kobj, struct damon_sysfs_sample_filters, kobj); + + if (!mutex_trylock(&damon_sysfs_lock)) + return -EBUSY; + err =3D damon_sysfs_sample_filters_add_dirs(filters, nr); + mutex_unlock(&damon_sysfs_lock); + if (err) + return err; + + return count; +} + static void damon_sysfs_sample_filters_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_sample_filters, kobj)); } =20 +static struct kobj_attribute damon_sysfs_sample_filters_nr_attr =3D + __ATTR_RW_MODE(nr_filters, 0600); + static struct attribute *damon_sysfs_sample_filters_attrs[] =3D { + &damon_sysfs_sample_filters_nr_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_sample_filters); @@ -940,6 +1061,7 @@ static void damon_sysfs_sample_rm_dirs( if (sample->primitives) kobject_put(&sample->primitives->kobj); if (sample->filters) { + damon_sysfs_sample_filters_rm_dirs(sample->filters); kobject_put(&sample->filters->kobj); } } --=20 2.47.3