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 BE0F637C906; Sat, 25 Jul 2026 21:02:38 +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=1785013360; cv=none; b=NeFrhyaaYgvDs9P44H0G6VOnjGCX8k+YE0by6cRuiRTu9yPLj2G+a3wi9CRP/F2/YkvndR1FNuekMsnUyrhzzjikJqAM01QE+xY0iLgAiZH2zs+Rrm7ZZDxy+viPE90rm2Jac5xG43KXtsRMbWd8jrPqC5gfB1Ul/c6SIChYAr4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785013360; c=relaxed/simple; bh=sz0CjYvpt6aNz5JQVYSRvhMLrWbyeiH5bxS8pGC+h2k=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=tU6m/wkPYvIBKhQxU6PV88Zh0Txzv1OSwbFe1PZJefTwA+sf889fwe8yl7gAdOG7w5Pk1hj50piXt2kuRh0apnQ76WzK1kolseFb3jPYFavgfcXPwVuLzGl2ZMe3yDIsdEA87svXyYZVnV9lT171Y+I9KBIpDmOc7LUoiAWg/W4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=TBKBsr0m; 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="TBKBsr0m" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 832F61F00ACA; Sat, 25 Jul 2026 21:02:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785013358; bh=LmA3iKd/w3WhYo4qwFeV2q0iE2mBXogisOL0j6VtBhc=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=TBKBsr0m37fHqDZv+bnQf0ZwWA0bMy5FfmqnyQ4nY0BSsjNvPa0UkKiBBJ8BtOaQF 2VPEAvztnLfYZRBsL1BxAqN9+VDKXe/smRPl/eZaFS5BSQsEl5y58ZoG++7evSp9pF aCHsFkxQDEEVTsRTarEIPQQpYjefLIEKRlmlAIrQK82LQkDB3wUUc4YA6e5Ec5vdSH yT66FY989zM3jIcbfkgzhlG6KxmS1WU/zEDtnfECbbSD1tmWa04KtykNj6FAykIeUK 7/q4iGI/3sDBYN4SIf3GTpHPLvdD9vGNSJZLbaeIyj5LnF3/xv56M2Lb1pa/IWWGUP njXiLjA7GE4Vg== 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 12/17] mm/damon/sysfs: create probe prep files for preps/nr file write Date: Sat, 25 Jul 2026 14:02:16 -0700 Message-ID: <20260725210225.129944-13-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260725210225.129944-1-sj@kernel.org> References: <20260725210225.129944-1-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 preps/nr file write operation to really create the probe prep directories and their files. Signed-off-by: SJ Park --- mm/damon/sysfs.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 53 insertions(+), 1 deletion(-) diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c index b15ec082109b7..f275a6f73eee1 100644 --- a/mm/damon/sysfs.c +++ b/mm/damon/sysfs.c @@ -759,6 +759,17 @@ struct damon_sysfs_prep { enum damon_prep_action action; }; +static struct damon_sysfs_prep *damon_sysfs_prep_alloc(void) +{ + struct damon_sysfs_prep *prep; + + prep = kzalloc_obj(struct damon_sysfs_prep); + if (!prep) + return prep; + prep->action = DAMON_PREP_SET_PGIDLE; + return prep; +} + struct damon_sysfs_prep_action_name { enum damon_prep_action action; char *name; @@ -839,6 +850,7 @@ static const struct kobj_type damon_sysfs_prep_ktype = { struct damon_sysfs_preps { struct kobject kobj; + struct damon_sysfs_prep **preps_arr; int nr; }; @@ -849,13 +861,53 @@ static struct damon_sysfs_preps *damon_sysfs_preps_alloc(void) static void damon_sysfs_preps_rm_dirs(struct damon_sysfs_preps *preps) { + struct damon_sysfs_prep **preps_arr = preps->preps_arr; + int i; + + for (i = 0; i < preps->nr; i++) { + kobject_del(&preps_arr[i]->kobj); + kobject_put(&preps_arr[i]->kobj); + } preps->nr = 0; + kfree(preps_arr); + preps->preps_arr = NULL; } static int damon_sysfs_preps_add_dirs(struct damon_sysfs_preps *preps, int nr_preps) { - preps->nr = nr_preps; + struct damon_sysfs_prep **preps_arr, *prep; + int err, i; + + damon_sysfs_preps_rm_dirs(preps); + if (!nr_preps) + return 0; + + preps_arr = kmalloc_objs(*preps_arr, nr_preps, + GFP_KERNEL | __GFP_NOWARN); + if (!preps_arr) + return -ENOMEM; + preps->preps_arr = preps_arr; + + for (i = 0; i < nr_preps; i++) { + prep = damon_sysfs_prep_alloc(); + if (!prep) { + damon_sysfs_preps_rm_dirs(preps); + return -ENOMEM; + } + + err = kobject_init_and_add(&prep->kobj, + &damon_sysfs_prep_ktype, &preps->kobj, "%d", + i); + if (err) { + kobject_put(&prep->kobj); + damon_sysfs_preps_rm_dirs(preps); + return err; + } + + preps_arr[i] = prep; + preps->nr++; + } return 0; } -- 2.47.3