From nobody Wed Apr 24 17:30:12 2024 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id C6B6EC433FE for ; Thu, 24 Nov 2022 21:21:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229687AbiKXVVn (ORCPT ); Thu, 24 Nov 2022 16:21:43 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53310 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229613AbiKXVVZ (ORCPT ); Thu, 24 Nov 2022 16:21:25 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A9C9594A50 for ; Thu, 24 Nov 2022 13:21:24 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 4732362256 for ; Thu, 24 Nov 2022 21:21:24 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4E820C43145; Thu, 24 Nov 2022 21:21:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1669324883; bh=P6PPKcChryRiegofLGkES15aSEw/aJpUh0oNfEpl4kg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=csE2P2pP80gwh9YjLKh9Ih3bnqn66ojFLUM6VT7+M/2+HoETHDkdMQvfgZ4/Gv7Cm GlyAmfjL2tClgHeSpoe4KSS4bfabmWQT2PfRA7FHssoVA2bn8kLknicRPVPM7TIjoV u+LUNjonDlYIYHphKh0ajOWEP3mOO1Tb4rp+tTArrAVvpTdn0OcpLyYBtu/x6gLIP1 NyBgK0wZkffaQxDltOfBkSd5de+FejYYAI8rX2AnthkOftYfxjEyB29v2P+CJcpzW6 OlLHkaL55NjZ2NxLHXoPdeNtmCcZLrQzzes7yUeE7l0kUXs26fGQdibS4XlRabDgbD 1kyLxx7xuDKXg== From: SeongJae Park To: Andrew Morton Cc: damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, SeongJae Park Subject: [RFC PATCH 07/11] mm/damon/sysfs-schemes: connect filter directory and filters directory Date: Thu, 24 Nov 2022 21:21:10 +0000 Message-Id: <20221124212114.136863-8-sj@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221124212114.136863-1-sj@kernel.org> References: <20221124212114.136863-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Implement 'nr_filters' file under 'filters' directory, which will be used to populate specific number of 'filter' directory under the directory, similar to other 'nr_*' files in DAMON sysfs interface. Signed-off-by: SeongJae Park --- mm/damon/sysfs-schemes.c | 67 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 67 insertions(+) diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c index afbfc55a8e84..7f2bab617156 100644 --- a/mm/damon/sysfs-schemes.c +++ b/mm/damon/sysfs-schemes.c @@ -269,6 +269,11 @@ struct damon_sysfs_scheme_filter { char *memcg_path; }; =20 +static struct damon_sysfs_scheme_filter *damon_sysfs_scheme_filter_alloc(v= oid) +{ + return kzalloc(sizeof(struct damon_sysfs_scheme_filter), GFP_KERNEL); +} + /* Should match with enum damos_filter_type */ static const char * const damon_sysfs_scheme_filter_type_strs[] =3D { "anon", @@ -392,6 +397,7 @@ static struct kobj_type damon_sysfs_scheme_filter_ktype= =3D { =20 struct damon_sysfs_scheme_filters { struct kobject kobj; + struct damon_sysfs_scheme_filter **filters_arr; int nr; }; =20 @@ -401,6 +407,57 @@ damon_sysfs_scheme_filters_alloc(void) return kzalloc(sizeof(struct damon_sysfs_scheme_filters), GFP_KERNEL); } =20 +static void damon_sysfs_scheme_filters_rm_dirs( + struct damon_sysfs_scheme_filters *filters) +{ + struct damon_sysfs_scheme_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_scheme_filters_add_dirs( + struct damon_sysfs_scheme_filters *filters, int nr_filters) +{ + struct damon_sysfs_scheme_filter **filters_arr, *filter; + int err, i; + + damon_sysfs_scheme_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_scheme_filter_alloc(); + if (!filter) { + damon_sysfs_scheme_filters_rm_dirs(filters); + return -ENOMEM; + } + + err =3D kobject_init_and_add(&filter->kobj, + &damon_sysfs_scheme_filter_ktype, + &filters->kobj, "%d", i); + if (err) { + kobject_put(&filter->kobj); + damon_sysfs_scheme_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) { @@ -413,6 +470,7 @@ static ssize_t nr_filters_show(struct kobject *kobj, static ssize_t nr_filters_store(struct kobject *kobj, struct kobj_attribute *attr, const char *buf, size_t count) { + struct damon_sysfs_scheme_filters *filters; int nr, err =3D kstrtoint(buf, 0, &nr); =20 if (err) @@ -420,6 +478,15 @@ static ssize_t nr_filters_store(struct kobject *kobj, if (nr < 0) return -EINVAL; =20 + filters =3D container_of(kobj, struct damon_sysfs_scheme_filters, kobj); + + if (!mutex_trylock(&damon_sysfs_lock)) + return -EBUSY; + err =3D damon_sysfs_scheme_filters_add_dirs(filters, nr); + mutex_unlock(&damon_sysfs_lock); + if (err) + return err; + return count; } =20 --=20 2.25.1