From mboxrd@z Thu Jan 1 00:00:00 1970 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 CD40E30C615 for ; Fri, 24 Apr 2026 11:35:52 +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=1777030552; cv=none; b=bq8RaSZSa/3Hp8HmEdG7Byb+vwWNMlkHtISi+RMxfqwjVXYek2e+QZIC/HHXOLRx6vZ6pxED+tIKeUBQetaOZqse57twWgDH+rF5qjMatg+kq/kV3IH8thLqTquQJoMlVOXsbRIMEItFDkN3OeYt+AGbXlEwyXtH7hJ23Ok66EY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777030552; c=relaxed/simple; bh=PeQU7W1Yiy0vr2cwNJjkJLwQDDqPk6uqHKE8e6RnlJo=; h=Date:To:From:Subject:Message-Id; b=LB0ctBr+P0RBLzyM961QMwsBKbzvf0O/Y1sM/qPBr+Ne2c60yonwcr4Qo0TuBmD/ejD9evHN3UTV9lmz/Awvpc12yYyiRnRFif223q9aHnLsSvizf3Xeo4n214kWK/dzMgoZrI9OrN/Tf0UbW5Cq4vYEp2TgDBQ4t16uzBzk7HI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=fusKX1gC; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="fusKX1gC" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6FB45C19425; Fri, 24 Apr 2026 11:35:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1777030552; bh=PeQU7W1Yiy0vr2cwNJjkJLwQDDqPk6uqHKE8e6RnlJo=; h=Date:To:From:Subject:From; b=fusKX1gCU7MX7I5o0WvW/S7/mSw1qH/8rN2USCooREMf4fo6eLDfH9vBxU0f/mIQ6 XkJh3twZ8RE1UhNC2vTR7pV8q9d9BRdJhjlAO0SyDFK0+yzjjFs71BfGWGBy5zjldI 9FJguaPM8HpGbv804zr7m5cIHwiOpwglrMD9I1V0= Date: Fri, 24 Apr 2026 04:35:51 -0700 To: mm-commits@vger.kernel.org,ziy@nvidia.com,vbabka@kernel.org,surenb@google.com,mhocko@suse.com,jackmanb@google.com,hannes@cmpxchg.org,zhen.ni@easystack.cn,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-page_owner-add-numa-node-filter-with-nodelist-support.patch added to mm-new branch Message-Id: <20260424113552.6FB45C19425@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: mm/page_owner: add NUMA node filter with nodelist support has been added to the -mm mm-new branch. Its filename is mm-page_owner-add-numa-node-filter-with-nodelist-support.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-page_owner-add-numa-node-filter-with-nodelist-support.patch This patch will later appear in the mm-new branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Note, mm-new is a provisional staging ground for work-in-progress patches, and acceptance into mm-new is a notification for others take notice and to finish up reviews. Please do not hesitate to respond to review feedback and post updated versions to replace or incrementally fixup patches in mm-new. The mm-new branch of mm.git is not included in linux-next If a few days of testing in mm-new is successful, the patch will me moved into mm.git's mm-unstable branch, which is included in linux-next Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via various branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there most days ------------------------------------------------------ From: Zhen Ni Subject: mm/page_owner: add NUMA node filter with nodelist support Date: Sun, 19 Apr 2026 23:55:40 +0800 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/ Link: https://lore.kernel.org/20260419155540.376847-4-zhen.ni@easystack.cn Signed-off-by: Zhen Ni Suggested-by: Zi Yan Cc: Brendan Jackman Cc: Johannes Weiner Cc: Michal Hocko Cc: Suren Baghdasaryan Cc: Vlastimil Babka Signed-off-by: Andrew Morton --- mm/page_owner.c | 76 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 76 insertions(+) --- a/mm/page_owner.c~mm-page_owner-add-numa-node-filter-with-nodelist-support +++ a/mm/page_owner.c @@ -707,6 +707,7 @@ read_page_owner(struct file *file, char * 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 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 &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, _ Patches currently in -mm which might be from zhen.ni@easystack.cn are mm-page_owner-add-filter-infrastructure.patch mm-page_owner-add-print_mode-filter.patch mm-page_owner-add-numa-node-filter-with-nodelist-support.patch