From patchwork Wed Nov 30 20:09:33 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: SeongJae Park X-Patchwork-Id: 13060352 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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1DB59C4708D for ; Wed, 30 Nov 2022 20:09:53 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id ED1F56B007D; Wed, 30 Nov 2022 15:09:47 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id E10186B0082; Wed, 30 Nov 2022 15:09:47 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 99CF96B007D; Wed, 30 Nov 2022 15:09:47 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id 76C9E6B007E for ; Wed, 30 Nov 2022 15:09:47 -0500 (EST) Received: from smtpin07.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay05.hostedemail.com (Postfix) with ESMTP id 34C99409E8 for ; Wed, 30 Nov 2022 20:09:47 +0000 (UTC) X-FDA: 80191199214.07.DFF8CB8 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by imf09.hostedemail.com (Postfix) with ESMTP id C286F14000B for ; Wed, 30 Nov 2022 20:09:46 +0000 (UTC) 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 059D261DB3; Wed, 30 Nov 2022 20:09:46 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6CE31C433B5; Wed, 30 Nov 2022 20:09:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1669838985; bh=5gMO8cLybx9rIEkN5/YUfJzDl3RNG0bek/qaVakfGfg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fyEPngwuZpVCPKj0e4uOCSDx1BCpnCetVtcL2MqZ+HTFvvcTE+G86n+1jV6SP+6EO XZmbJPiZlX613JojRgXLTRSeb2MhX6AL1OsbR3a2aZJ5FoS7f9NRCK58qGKpvjNkRh ssiEsUhB0xW1+ku46FANT3BoQsRClM2BgOSZ1Tx1Qvw+5jZpi651bYaEP5HIqDCb3N GlYxUZI0asZT/EOpSD9bhKm6kfPLyNbmM9X1Ei6uhIpAqkJCO+tJJWA/X3EOW0BcBB +eiRVYe6zTRYYJ/iul6USKYxNXgTARb6RrYExJqSvZc+jkFtC8mF4Wl0J9uaCNTLdw H0ApioDCwbF1Q== From: SeongJae Park To: SeongJae Park , Andrew Morton Cc: damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH v2 07/11] mm/damon/sysfs-schemes: connect filter directory and filters directory Date: Wed, 30 Nov 2022 20:09:33 +0000 Message-Id: <20221130200937.118005-8-sj@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221130200937.118005-1-sj@kernel.org> References: <20221130200937.118005-1-sj@kernel.org> MIME-Version: 1.0 ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1669838986; a=rsa-sha256; cv=none; b=aqFpt5W0BlkyaXYiQD+uscMjHdDo+UqJtiCNVzhLIsVRlSRoCojxETUXbetHGOyDxjhayS 77JlMsw458tvozHQzr0JB3fwzpTBN620iJ2OhvpY1gMt01jf45ejorijPUr1YIL0wMKq1d 3yP0Aiy8h22b+I09bL3R5ijaFy/QN6I= ARC-Authentication-Results: i=1; imf09.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=fyEPngwu; spf=pass (imf09.hostedemail.com: domain of sj@kernel.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=sj@kernel.org; dmarc=pass (policy=none) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1669838986; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=Pp1yUJLa+MIK3wToikS/B21yRm2JhREhRKEMfqbq6ds=; b=g9qCw81wZphIcg16LO/YN4wqWZele+p6gPErxe0PvKN4oLmmhoI045WuV672uwopBKQsTA ttyqmDW25JAmDZLCwksaD5NKIYi5OYl1aP0OY1E3WyofQ2HYwYBA9M/coDEJmJJmWbCKZR p9SRCxrltEEpsShVOgMLgFC/vVt21Ic= X-Stat-Signature: 8mtu13cs33s4hdigf8pe9jn864k7au5r X-Rspamd-Queue-Id: C286F14000B X-Rspam-User: Authentication-Results: imf09.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=fyEPngwu; spf=pass (imf09.hostedemail.com: domain of sj@kernel.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=sj@kernel.org; dmarc=pass (policy=none) header.from=kernel.org X-Rspamd-Server: rspam05 X-HE-Tag: 1669838986-803145 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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 | 68 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 68 insertions(+) diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c index afbfc55a8e84..e79c678a69d5 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; }; +static struct damon_sysfs_scheme_filter *damon_sysfs_scheme_filter_alloc(void) +{ + 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[] = { "anon", @@ -392,6 +397,7 @@ static struct kobj_type damon_sysfs_scheme_filter_ktype = { struct damon_sysfs_scheme_filters { struct kobject kobj; + struct damon_sysfs_scheme_filter **filters_arr; int nr; }; @@ -401,6 +407,57 @@ damon_sysfs_scheme_filters_alloc(void) return kzalloc(sizeof(struct damon_sysfs_scheme_filters), GFP_KERNEL); } +static void damon_sysfs_scheme_filters_rm_dirs( + struct damon_sysfs_scheme_filters *filters) +{ + struct damon_sysfs_scheme_filter **filters_arr = filters->filters_arr; + int i; + + for (i = 0; i < filters->nr; i++) + kobject_put(&filters_arr[i]->kobj); + filters->nr = 0; + kfree(filters_arr); + filters->filters_arr = 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 = kmalloc_array(nr_filters, sizeof(*filters_arr), + GFP_KERNEL | __GFP_NOWARN); + if (!filters_arr) + return -ENOMEM; + filters->filters_arr = filters_arr; + + for (i = 0; i < nr_filters; i++) { + filter = damon_sysfs_scheme_filter_alloc(); + if (!filter) { + damon_sysfs_scheme_filters_rm_dirs(filters); + return -ENOMEM; + } + + err = 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] = 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 = kstrtoint(buf, 0, &nr); if (err) @@ -420,6 +478,15 @@ static ssize_t nr_filters_store(struct kobject *kobj, if (nr < 0) return -EINVAL; + filters = container_of(kobj, struct damon_sysfs_scheme_filters, kobj); + + if (!mutex_trylock(&damon_sysfs_lock)) + return -EBUSY; + err = damon_sysfs_scheme_filters_add_dirs(filters, nr); + mutex_unlock(&damon_sysfs_lock); + if (err) + return err; + return count; } @@ -1166,6 +1233,7 @@ static void damon_sysfs_scheme_rm_dirs(struct damon_sysfs_scheme *scheme) damon_sysfs_quotas_rm_dirs(scheme->quotas); kobject_put(&scheme->quotas->kobj); kobject_put(&scheme->watermarks->kobj); + damon_sysfs_scheme_filters_rm_dirs(scheme->filters); kobject_put(&scheme->filters->kobj); kobject_put(&scheme->stats->kobj); damon_sysfs_scheme_regions_rm_dirs(scheme->tried_regions);