+ proc-meminfo-expose-per-node-balloon-pages-in-node-meminfo.patch added to mm-unstable branch

+ proc-meminfo-expose-per-node-balloon-pages-in-node-meminfo.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: proc/meminfo: expose per-node balloon pages in node meminfo
has been added to the -mm mm-unstable branch.  Its filename is
     proc-meminfo-expose-per-node-balloon-pages-in-node-meminfo.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/proc-meminfo-expose-per-node-balloon-pages-in-node-meminfo.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Hao Ge <hao.ge@linux.dev>
Subject: proc/meminfo: expose per-node balloon pages in node meminfo
Date: Sat, 9 May 2026 08:56:31 +0800

Commit 835de37603ef ("meminfo: add a per node counter for balloon
drivers") added NR_BALLOON_PAGES and exposed it in /proc/meminfo. 
However, the per-node view at /sys/devices/system/node/nodeX/meminfo was
not updated, even though the counter is already tracked per-node.

Add it to node_read_meminfo() so users can see balloon usage per NUMA node
without having to parse the raw vmstat file.

Link: https://lore.kernel.org/20260509005631.17183-1-hao.ge@linux.dev
Signed-off-by: Hao Ge <hao.ge@linux.dev>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Cc: Danilo Krummrich <dakr@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/base/node.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/base/node.c~proc-meminfo-expose-per-node-balloon-pages-in-node-meminfo
+++ a/drivers/base/node.c
@@ -523,6 +523,7 @@ static ssize_t node_read_meminfo(struct
 #ifdef CONFIG_UNACCEPTED_MEMORY
 			     "Node %d Unaccepted:     %8lu kB\n"
 #endif
+			     "Node %d Balloon:        %8lu kB\n"
 			     "Node %d GPUActive:      %8lu kB\n"
 			     "Node %d GPUReclaim:     %8lu kB\n"
 			     ,
@@ -559,6 +560,7 @@ static ssize_t node_read_meminfo(struct
 			     nid, K(sum_zone_node_page_state(nid, NR_UNACCEPTED))
 #endif
 			     ,
+			     nid, K(node_page_state(pgdat, NR_BALLOON_PAGES)),
 			     nid, K(node_page_state(pgdat, NR_GPU_ACTIVE)),
 			     nid, K(node_page_state(pgdat, NR_GPU_RECLAIM))
 			    );
_

Patches currently in -mm which might be from hao.ge@linux.dev are

mm-alloc_tag-replace-fixed-size-early-pfn-array-with-dynamic-linked-list.patch
proc-meminfo-expose-per-node-balloon-pages-in-node-meminfo.patch