From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-m1973177.qiye.163.com (mail-m1973177.qiye.163.com [220.197.31.77]) (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 CB3FE284662 for ; Sun, 19 Apr 2026 16:31:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=220.197.31.77 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776616303; cv=none; b=upVnwbVdue4pPbcA3zUlUfG7K+/eSN6A0wYVc9QDRXcMlIt10voaVZ0s1eous2mL9e8E36VD/kL/FSn010Ko2gcFGWWRj5AqpZ7u4gPvUzXcaC3eNz8m410DSctjxY9be/SAHiNG4kPR2JLKjXdBKxwW4PpGx4Uex9mF/cBLw7c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776616303; c=relaxed/simple; bh=Q4MZFP0LpneIA743/FCC8Pyv/3LkGv3TzyPy4vnR+1o=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=DhiZe/KNKFUYJA/ecO1swUUaZ7KM16qIgYti982aQOwVc8XXj9ZTlL8qJzvB/Fp1uN51XbdEdR0UjnZyRg7WI+5X0MP8bOqXkIrXdjrx03fA+4y84/ybfvw1RJIwfMW7d6kfxGHkJM+/VyHrSt3qkz231qcHt7LI4bg1GThG4DQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=easystack.cn; spf=pass smtp.mailfrom=easystack.cn; arc=none smtp.client-ip=220.197.31.77 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=easystack.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=easystack.cn Received: from localhost.localdomain (unknown [IPV6:2409:8a20:ef7:a5b4:8810:8f74:8c26:2]) by smtp.qiye.163.com (Hmail) with ESMTP id 1918e52ac; Sun, 19 Apr 2026 23:55:59 +0800 (GMT+08:00) From: Zhen Ni To: akpm@linux-foundation.org, vbabka@kernel.org Cc: surenb@google.com, mhocko@suse.com, jackmanb@google.com, hannes@cmpxchg.org, ziy@nvidia.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Zhen Ni Subject: [PATCH v2 3/3] mm/page_owner: add NUMA node filter with nodelist support Date: Sun, 19 Apr 2026 23:55:40 +0800 Message-Id: <20260419155540.376847-4-zhen.ni@easystack.cn> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20260419155540.376847-1-zhen.ni@easystack.cn> References: <20260419155540.376847-1-zhen.ni@easystack.cn> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-HM-Tid: 0a9da674b3dd0229kunma1b4aa74234e94 X-HM-MType: 1 X-HM-Spam-Status: e1kfGhgUHx5ZQUpXWQgPGg8OCBgUHx5ZQUlOS1dZFg8aDwILHllBWSg2Ly tZV1koWUFJQjdXWS1ZQUlXWQ8JGhUIEh9ZQVlDSh5CVh8fGRlKTR9LTUhKT1YVFAkWGhdVGRETFh oSFyQUDg9ZV1kYEgtZQVlJT0tCQUMaSUtBHh1MQRpOGU9BQ0NKS0FDHUxPQUMYSU1BSVlXWRYaDx IVHRRZQVlPS0hVSktISk5MTlVKS0tVSkJLS1kG Add NUMA node filtering functionality to page_owner to allow filtering pages by specific NUMA node(s) using nodelist format. The filter allows users to focus on pages from specific NUMA nodes, which is useful for NUMA-aware memory allocation analysis and debugging. Supported input formats: - Single node: echo "2" > nid - Multiple nodes: echo "0,2,3" > nid - Node range: echo "0-3" > nid - Mixed format: echo "0,2-4,7" > nid - Disable filter: echo "-1" > nid Link: https://lore.kernel.org/linux-mm/20260417154638.22370-4-zhen.ni@easystack.cn/ Suggested-by: Zi Yan Signed-off-by: Zhen Ni --- Changes in v2: - Use nodemask_t instead of int to support multiple nodes - Implement nodelist_parse() to support flexible input formats * Single node: "0", "2" * Multiple nodes: "0,2,3" * Ranges: "0-3" * Mixed: "0,2-4,7" - Use %*pbl format for output (e.g., "0-2", "0,2-4,7") - Use dynamic memory allocation (kmalloc) to handle variable-length input - Follow cpuset's max_write_len pattern: (100 + 6 * MAX_NUMNODES) --- mm/page_owner.c | 76 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 76 insertions(+) diff --git a/mm/page_owner.c b/mm/page_owner.c index 6d87b6948cfa..8c13bb3798d8 100644 --- a/mm/page_owner.c +++ b/mm/page_owner.c @@ -707,6 +707,7 @@ read_page_owner(struct file *file, char __user *buf, size_t count, loff_t *ppos) * user through copy_to_user() or GFP_KERNEL allocations. */ struct page_owner page_owner_tmp; + nodemask_t mask; /* * If the new page is in a new MAX_ORDER_NR_PAGES area, @@ -730,6 +731,15 @@ read_page_owner(struct file *file, char __user *buf, size_t count, loff_t *ppos) if (unlikely(!page_ext)) continue; + /* NUMA node filter using bitmask */ + mask = READ_ONCE(owner_filter.nid_mask); + if (!nodes_empty(mask)) { + int nid = page_to_nid(page); + + if (!node_isset(nid, mask)) + goto ext_put_continue; + } + /* * Some pages could be missed by concurrent allocation or free, * because we don't hold the zone lock. @@ -1009,6 +1019,70 @@ DEFINE_SIMPLE_ATTRIBUTE(page_owner_print_mode_fops, &page_owner_print_mode_get, &page_owner_print_mode_set, "%lld"); +static ssize_t nid_filter_write(struct file *file, + const char __user *buf, + size_t count, loff_t *ppos) +{ + char *kbuf; + nodemask_t mask; + int ret; + + /* Limit input size to handle worst-case nodelist (all nodes) */ + if (count > (100 + 6 * MAX_NUMNODES)) + return -EINVAL; + + kbuf = kmalloc(count + 1, GFP_KERNEL); + if (!kbuf) + return -ENOMEM; + + if (copy_from_user(kbuf, buf, count)) { + ret = -EFAULT; + goto out_free; + } + kbuf[count] = '\0'; + + /* Support: "-1" to clear, or nodelist format like "0", "0,2", "0-3" */ + if (strcmp(kbuf, "-1\n") == 0 || strcmp(kbuf, "-1") == 0) + nodes_clear(mask); + else if (nodelist_parse(kbuf, mask)) { + ret = -EINVAL; + goto out_free; + } + + WRITE_ONCE(owner_filter.nid_mask, mask); + ret = count; + +out_free: + kfree(kbuf); + return ret; +} + +static int nid_filter_show(struct seq_file *m, void *v) +{ + nodemask_t mask = READ_ONCE(owner_filter.nid_mask); + + if (nodes_empty(mask)) + seq_puts(m, "-1\n"); + else + seq_printf(m, "%*pbl\n", nodemask_pr_args(&mask)); + + return 0; +} + +static int nid_filter_open(struct inode *inode, struct file *file) +{ + return single_open(file, nid_filter_show, NULL); +} + +static const struct file_operations nid_filter_fops = { + .owner = THIS_MODULE, + .open = nid_filter_open, + .read = seq_read, + .llseek = seq_lseek, + .write = nid_filter_write, + .release = single_release, +}; + static int __init pageowner_init(void) { @@ -1024,6 +1098,8 @@ static int __init pageowner_init(void) filter_dir = debugfs_create_dir("page_owner_filter", NULL); debugfs_create_file("print_mode", 0600, filter_dir, NULL, &page_owner_print_mode_fops); + debugfs_create_file("nid", 0600, filter_dir, NULL, + &nid_filter_fops); dir = debugfs_create_dir("page_owner_stacks", NULL); debugfs_create_file("show_stacks", 0400, dir, -- 2.20.1