On Fri, 8 May 2026 17:47:36 +0800 Hao Ge <[email protected]> wrote:
> 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.
>
> ...
>
> --- a/drivers/base/node.c
> +++ b/drivers/base/node.c
> @@ -523,6 +523,7 @@ static ssize_t node_read_meminfo(struct device *dev,
> #ifdef CONFIG_UNACCEPTED_MEMORY
> "Node %d Unaccepted: %8lu kB\n"
> #endif
> + "Node %d Balloon: %8lu kB\n"
> ,
> nid, K(node_page_state(pgdat, NR_FILE_DIRTY)),
> nid, K(node_page_state(pgdat, NR_WRITEBACK)),
> @@ -556,6 +557,8 @@ static ssize_t node_read_meminfo(struct device *dev,
> ,
> nid, K(sum_zone_node_page_state(nid,
> NR_UNACCEPTED))
> #endif
> + ,
> + nid, K(node_page_state(pgdat, NR_BALLOON_PAGES))
> );
> len += hugetlb_report_node_meminfo(buf, len, nid);
> return len;
This was prepared against a kernel whcih didn't have 2232ba9c7931 ("mm:
add gpu active/reclaim per-node stat counters (v2)"). Which was added
in February, btw.
Please check my fixings:
---
a/drivers/base/node.c~mm-balloon-expose-per-node-balloon-pages-in-node-meminfo
+++ a/drivers/base/node.c
@@ -525,6 +525,7 @@ static ssize_t node_read_meminfo(struct
#endif
"Node %d GPUActive: %8lu kB\n"
"Node %d GPUReclaim: %8lu kB\n"
+ "Node %d Balloon: %8lu kB\n"
,
nid, K(node_page_state(pgdat, NR_FILE_DIRTY)),
nid, K(node_page_state(pgdat, NR_WRITEBACK)),
@@ -560,7 +561,8 @@ static ssize_t node_read_meminfo(struct
#endif
,
nid, K(node_page_state(pgdat, NR_GPU_ACTIVE)),
- nid, K(node_page_state(pgdat, NR_GPU_RECLAIM))
+ nid, K(node_page_state(pgdat, NR_GPU_RECLAIM)),
+ nid, K(node_page_state(pgdat, NR_BALLOON_PAGES))
);
len += hugetlb_report_node_meminfo(buf, len, nid);
return len;
_
