+ mm-page_owner-add-filter-infrastructure.patch added to mm-new branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm/page_owner: add filter infrastructure
has been added to the -mm mm-new branch.  Its filename is
     mm-page_owner-add-filter-infrastructure.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-filter-infrastructure.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

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------------------------------------------------------
From: Zhen Ni <zhen.ni@easystack.cn>
Subject: mm/page_owner: add filter infrastructure
Date: Tue, 28 Apr 2026 15:11:09 +0800

Patch series "mm/page_owner: add filter infrastructure for print_mode and
NUMA filtering", v3.

This patch series introduces filtering capabilities to the page_owner
feature to address storage and performance challenges in production
environments.


This patch (of 4):

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/20260428071112.1420380-1-zhen.ni@easystack.cn
Link: https://lore.kernel.org/linux-mm/20260417154638.22370-2-zhen.ni@easystack.cn/
Link: https://lore.kernel.org/20260428071112.1420380-2-zhen.ni@easystack.cn
Signed-off-by: Zhen Ni <zhen.ni@easystack.cn>
Suggested-by: Zi Yan <ziy@nvidia.com>
Cc: Brendan Jackman <jackmanb@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Zhen Ni <zhen.ni@easystack.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/page_owner.c |   20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

--- a/mm/page_owner.c~mm-page_owner-add-filter-infrastructure
+++ a/mm/page_owner.c
@@ -54,6 +54,21 @@ struct stack_print_ctx {
 	u8 flags;
 };
 
+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 = {
+	.print_mode = PAGE_OWNER_PRINT_FULL_STACK,
+	.nid_mask = NODE_MASK_NONE,
+};
+
 static bool page_owner_enabled __initdata;
 DEFINE_STATIC_KEY_FALSE(page_owner_inited);
 
@@ -973,7 +988,7 @@ DEFINE_SIMPLE_ATTRIBUTE(page_owner_thres
 
 static int __init pageowner_init(void)
 {
-	struct dentry *dir;
+	struct dentry *dir, *filter_dir;
 
 	if (!static_branch_unlikely(&page_owner_inited)) {
 		pr_info("page_owner is disabled\n");
@@ -981,6 +996,9 @@ static int __init pageowner_init(void)
 	}
 
 	debugfs_create_file("page_owner", 0400, NULL, NULL, &page_owner_fops);
+
+	filter_dir = debugfs_create_dir("page_owner_filter", NULL);
+
 	dir = debugfs_create_dir("page_owner_stacks", NULL);
 	debugfs_create_file("show_stacks", 0400, dir,
 			    (void *)(STACK_PRINT_FLAG_STACK |
_

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
mm-page_owner-document-page_owner-filter-features.patch
mm-page_owner-fix-%pgp-format-specifier-argument-type.patch