From nobody Sat Jun 20 05:52:26 2026 Received: from mail-m3286.qiye.163.com (mail-m3286.qiye.163.com [220.197.32.86]) (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 B5DE7282F23 for ; Sun, 19 Apr 2026 17:11:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=220.197.32.86 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776618711; cv=none; b=ZydQwvQ/wQuOVLRXb7zQGEiRw4IM8IwhWqSpiVbkfU8U6lI/gjjJD64oChFONiSFNeVQFtEv2JFRiy+3IAbYxDIkKSxabcmvRjJ3ow4xr8E3ZGCBFKFQpGbnaYTWGSWLKyzhlLgv037aGmvnkcCk9/J4+ARHECobma7R23wYhvs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776618711; c=relaxed/simple; bh=fxYFAWqUqLHwoh5Z1DU+a41FxujT0uR6Meu0PIzAxdA=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=S3ZNVJrwCG0GB+0vUPCXCHYNXp5ytB/O0MK9xsXulBNv9ybW0b+YvkjMQMMRbLaoMIYKKpYPvEQFcSt/eCIG3cbx1ccvXfDiniyBiu6ovGXchlXkkFVHaPe3Pgg55ZFORFBUM5ndZgGuzgZqA/AuHHC2Zj3Bg39AeJezM6dr2G0= 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=220.197.32.86 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 1918e52a9; Sun, 19 Apr 2026 23:55:55 +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 1/3] mm/page_owner: add filter infrastructure Date: Sun, 19 Apr 2026 23:55:38 +0800 Message-Id: <20260419155540.376847-2-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: quoted-printable X-HM-Tid: 0a9da674a44d0229kunma1b4aa74234e87 X-HM-MType: 1 X-HM-Spam-Status: e1kfGhgUHx5ZQUpXWQgPGg8OCBgUHx5ZQUlOS1dZFg8aDwILHllBWSg2Ly tZV1koWUFJQjdXWS1ZQUlXWQ8JGhUIEh9ZQVlDHkNKVkgdTEwYHkhPTkJCS1YVFAkWGhdVGRETFh oSFyQUDg9ZV1kYEgtZQVlJT0tCQUMaSUtBHh1MQRpOGU9BQ0NKS0FDHUxPQUMYSU1BSVlXWRYaDx IVHRRZQVlPS0hVSktJT09PSFVKS0tVSkJLS1kG Content-Type: text/plain; charset="utf-8" Add data structure for page_owner filtering functionality and create debugfs directory for filter controls. This adds: - enum page_owner_print_mode with values for full_stack and stack_handle - struct page_owner_filter with print_mode and nid_mask fields - Static owner_filter instance initialized with default values - page_owner_filter debugfs directory The filter infrastructure will be used to add print_mode and NUMA node filtering capabilities in subsequent commits. Link: https://lore.kernel.org/linux-mm/20260417154638.22370-2-zhen.ni@easys= tack.cn/ Suggested-by: Zi Yan Signed-off-by: Zhen Ni --- Changes in v2: - Use enum page_owner_print_mode instead of bool 'compact' for better clari= ty - Use nodemask_t instead of int 'nid' to support multi-node filtering --- mm/page_owner.c | 20 +++++++++++++++++++- 1 file changed, 19 insertions(+), 1 deletion(-) diff --git a/mm/page_owner.c b/mm/page_owner.c index 8178e0be557f..5884d883837e 100644 --- a/mm/page_owner.c +++ b/mm/page_owner.c @@ -54,6 +54,21 @@ struct stack_print_ctx { u8 flags; }; =20 +enum page_owner_print_mode { + PAGE_OWNER_PRINT_FULL_STACK, + PAGE_OWNER_PRINT_STACK_HANDLE, +}; + +struct page_owner_filter { + enum page_owner_print_mode print_mode; + nodemask_t nid_mask; +}; + +static struct page_owner_filter owner_filter =3D { + .print_mode =3D PAGE_OWNER_PRINT_FULL_STACK, + .nid_mask =3D NODE_MASK_NONE, +}; + static bool page_owner_enabled __initdata; DEFINE_STATIC_KEY_FALSE(page_owner_inited); =20 @@ -973,7 +988,7 @@ DEFINE_SIMPLE_ATTRIBUTE(page_owner_threshold_fops, &pag= e_owner_threshold_get, =20 static int __init pageowner_init(void) { - struct dentry *dir; + struct dentry *dir, *filter_dir; =20 if (!static_branch_unlikely(&page_owner_inited)) { pr_info("page_owner is disabled\n"); @@ -981,6 +996,9 @@ static int __init pageowner_init(void) } =20 debugfs_create_file("page_owner", 0400, NULL, NULL, &page_owner_fops); + + filter_dir =3D debugfs_create_dir("page_owner_filter", NULL); + dir =3D debugfs_create_dir("page_owner_stacks", NULL); debugfs_create_file("show_stacks", 0400, dir, (void *)(STACK_PRINT_FLAG_STACK | --=20 2.20.1 From nobody Sat Jun 20 05:52:26 2026 Received: from mail-m3285.qiye.163.com (mail-m3285.qiye.163.com [220.197.32.85]) (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 0413B1A9F9B for ; Sun, 19 Apr 2026 17:11:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=220.197.32.85 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776618711; cv=none; b=lWxE+maKAVZ7qChKr2pIwYILqjC0I7EHqOIAGTvAff8NxbbCEExcMmMCe7pn8mxc90gewZK5dMw5s5FgDJAW3yemZSKZ/E0UtrZeojBJtMdL76TrFuaC4wsat8zP5rxxRWAgm02rAgBrHsmb2DkebGNxZj+sh0sisjXFYLcYuQU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776618711; c=relaxed/simple; bh=0f+Er4L4jZVYe2pmte9KnA2bEYszPgPP66NG6ZyE2K8=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=mxB69GMcTva/Sv5jaf11RCOVMc6zOhaQYeCQhMdGoxiuHg7cHcDBoRZireHZLBKoaR27+K68IuQDunHPj3rTQATCB/r0GcfLmJpCFbxmNoFfhA6XggMtkkUkX4JiIcuKaqQoqF7MY25VXBAvTUkrdkAzNkDpuMytUJztGarOSOQ= 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=220.197.32.85 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 1918e52ab; Sun, 19 Apr 2026 23:55:57 +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 2/3] mm/page_owner: add print_mode filter Date: Sun, 19 Apr 2026 23:55:39 +0800 Message-Id: <20260419155540.376847-3-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: quoted-printable X-HM-Tid: 0a9da674ada00229kunma1b4aa74234e8f X-HM-MType: 1 X-HM-Spam-Status: e1kfGhgUHx5ZQUpXWQgPGg8OCBgUHx5ZQUlOS1dZFg8aDwILHllBWSg2Ly tZV1koWUFJQjdXWS1ZQUlXWQ8JGhUIEh9ZQVkaHUwZVkJDShoeGkMYSEgfQ1YVFAkWGhdVGRETFh oSFyQUDg9ZV1kYEgtZQVlJT0tCQUMaSUtBHh1MQRpOGU9BQ0NKS0FDHUxPQUMYSU1BSVlXWRYaDx IVHRRZQVlPS0hVSktJT09PSFVKS0tVSkJLS1kG Content-Type: text/plain; charset="utf-8" Add print_mode functionality to reduce page_owner output size by printing only the stack handle instead of the full stack trace. Example output with print_mode enabled: Page allocated via order 0, mask 0x42800(GFP_NOWAIT|__GFP_COMP), pid 1, tgid 1 (systemd), ts 349667370 ns PFN 0xa00a2 type Unmovable Block 1280 type Unmovable Flags 0x33fffe0000004124(referenced|lru|active|private|node=3D3|zone=3D0| lastcpupid=3D0x1ffff) handle: 17432583 Charged to memcg / Print mode significantly reduces output size while preserving all other page allocation information. The correspondence between handles and stack traces can be obtained through the show_stacks_handles interface. Link: https://lore.kernel.org/linux-mm/20260417154638.22370-3-zhen.ni@easys= tack.cn/ Suggested-by: Zi Yan Signed-off-by: Zhen Ni --- Changes in v2: - Renamed from 'compact mode' to 'print_mode' for better clarity - Use enum values (0=3Dfull_stack, 1=3Dstack_handle) instead of boolean - Update debugfs filename from 'compact' to 'print_mode' --- mm/page_owner.c | 28 +++++++++++++++++++++++++++- 1 file changed, 27 insertions(+), 1 deletion(-) diff --git a/mm/page_owner.c b/mm/page_owner.c index 5884d883837e..6d87b6948cfa 100644 --- a/mm/page_owner.c +++ b/mm/page_owner.c @@ -590,7 +590,13 @@ print_page_owner(char __user *buf, size_t count, unsig= ned long pfn, migratetype_names[pageblock_mt], &page->flags); =20 - ret +=3D stack_depot_snprint(handle, kbuf + ret, count - ret, 0); + /* Print mode: full stack or stack handle */ + if (READ_ONCE(owner_filter.print_mode) =3D=3D PAGE_OWNER_PRINT_STACK_HAND= LE) { + ret +=3D scnprintf(kbuf + ret, count - ret, + "handle: %d\n", handle); + } else { + ret +=3D stack_depot_snprint(handle, kbuf + ret, count - ret, 0); + } if (ret >=3D count) goto err; =20 @@ -985,6 +991,24 @@ static int page_owner_threshold_set(void *data, u64 va= l) DEFINE_SIMPLE_ATTRIBUTE(page_owner_threshold_fops, &page_owner_threshold_g= et, &page_owner_threshold_set, "%llu"); =20 +static int page_owner_print_mode_get(void *data, u64 *val) +{ + *val =3D READ_ONCE(owner_filter.print_mode); + return 0; +} + +static int page_owner_print_mode_set(void *data, u64 val) +{ + if (val > PAGE_OWNER_PRINT_STACK_HANDLE) + return -EINVAL; + WRITE_ONCE(owner_filter.print_mode, val); + return 0; +} + +DEFINE_SIMPLE_ATTRIBUTE(page_owner_print_mode_fops, + &page_owner_print_mode_get, + &page_owner_print_mode_set, "%lld"); + =20 static int __init pageowner_init(void) { @@ -998,6 +1022,8 @@ static int __init pageowner_init(void) debugfs_create_file("page_owner", 0400, NULL, NULL, &page_owner_fops); =20 filter_dir =3D debugfs_create_dir("page_owner_filter", NULL); + debugfs_create_file("print_mode", 0600, filter_dir, NULL, + &page_owner_print_mode_fops); =20 dir =3D debugfs_create_dir("page_owner_stacks", NULL); debugfs_create_file("show_stacks", 0400, dir, --=20 2.20.1 From nobody Sat Jun 20 05:52:26 2026 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: quoted-printable X-HM-Tid: 0a9da674b3dd0229kunma1b4aa74234e94 X-HM-MType: 1 X-HM-Spam-Status: e1kfGhgUHx5ZQUpXWQgPGg8OCBgUHx5ZQUlOS1dZFg8aDwILHllBWSg2Ly tZV1koWUFJQjdXWS1ZQUlXWQ8JGhUIEh9ZQVlDSh5CVh8fGRlKTR9LTUhKT1YVFAkWGhdVGRETFh oSFyQUDg9ZV1kYEgtZQVlJT0tCQUMaSUtBHh1MQRpOGU9BQ0NKS0FDHUxPQUMYSU1BSVlXWRYaDx IVHRRZQVlPS0hVSktISk5MTlVKS0tVSkJLS1kG Content-Type: text/plain; charset="utf-8" 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@easys= tack.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, si= ze_t count, loff_t *ppos) * user through copy_to_user() or GFP_KERNEL allocations. */ struct page_owner page_owner_tmp; + nodemask_t mask; =20 /* * 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, s= ize_t count, loff_t *ppos) if (unlikely(!page_ext)) continue; =20 + /* NUMA node filter using bitmask */ + mask =3D READ_ONCE(owner_filter.nid_mask); + if (!nodes_empty(mask)) { + int nid =3D 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"); =20 +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 =3D kmalloc(count + 1, GFP_KERNEL); + if (!kbuf) + return -ENOMEM; + + if (copy_from_user(kbuf, buf, count)) { + ret =3D -EFAULT; + goto out_free; + } + kbuf[count] =3D '\0'; + + /* Support: "-1" to clear, or nodelist format like "0", "0,2", "0-3" */ + if (strcmp(kbuf, "-1\n") =3D=3D 0 || strcmp(kbuf, "-1") =3D=3D 0) + nodes_clear(mask); + else if (nodelist_parse(kbuf, mask)) { + ret =3D -EINVAL; + goto out_free; + } + + WRITE_ONCE(owner_filter.nid_mask, mask); + ret =3D count; + +out_free: + kfree(kbuf); + return ret; +} + +static int nid_filter_show(struct seq_file *m, void *v) +{ + nodemask_t mask =3D 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 =3D { + .owner =3D THIS_MODULE, + .open =3D nid_filter_open, + .read =3D seq_read, + .llseek =3D seq_lseek, + .write =3D nid_filter_write, + .release =3D single_release, +}; + =20 static int __init pageowner_init(void) { @@ -1024,6 +1098,8 @@ static int __init pageowner_init(void) filter_dir =3D 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); =20 dir =3D debugfs_create_dir("page_owner_stacks", NULL); debugfs_create_file("show_stacks", 0400, dir, --=20 2.20.1