The patch titled
Subject: meminfo: add a per node counter for balloon drivers
has been added to the -mm mm-unstable branch. Its filename is
meminfo-add-a-per-node-counter-for-balloon-drivers.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/meminfo-add-a-per-node-counter-for-balloon-drivers.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: Nico Pache <npache@xxxxxxxxxx>
Subject: meminfo: add a per node counter for balloon drivers
Date: Fri, 14 Mar 2025 15:37:54 -0600
Patch series "track memory used by balloon drivers", v2.
This series introduces a way to track memory used by balloon drivers.
Add a NR_BALLOON_PAGES counter to track how many pages are reclaimed by
the balloon drivers. First add the accounting, then updates the balloon
drivers (virtio, Hyper-V, VMware, Pseries-cmm, and Xen) to maintain this
counter. The virtio, Vmware, and pseries-cmm balloon drivers utilize the
balloon_compaction interface to allocate and free balloon pages. Other
balloon drivers will have to maintain this counter manually.
This makes the information visible in memory reporting interfaces like
/proc/meminfo, show_mem, and OOM reporting.
This provides admins visibility into their VM balloon sizes without
requiring different virtualization tooling. Furthermore, this information
is helpful when debugging an OOM inside a VM.
This patch (of 4):
Add NR_BALLOON_PAGES counter to track memory used by balloon drivers and
expose it through /proc/meminfo and other memory reporting interfaces.
Link: https://lkml.kernel.org/r/20250314213757.244258-1-npache@xxxxxxxxxx
Link: https://lkml.kernel.org/r/20250314213757.244258-2-npache@xxxxxxxxxx
Signed-off-by: Nico Pache <npache@xxxxxxxxxx>
Cc: Alexander Atanasov <alexander.atanasov@xxxxxxxxxxxxx>
Cc: Chengming Zhou <chengming.zhou@xxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Dexuan Cui <decui@xxxxxxxxxxxxx>
Cc: Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Juegren Gross <jgross@xxxxxxxx>
Cc: Kanchana P Sridhar <kanchana.p.sridhar@xxxxxxxxx>
Cc: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
Cc: "Michael S. Tsirkin" <mst@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Muchun Song <muchun.song@xxxxxxxxx>
Cc: Nhat Pham <nphamcs@xxxxxxxxx>
Cc: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
Cc: Roman Gushchin <roman.gushchin@xxxxxxxxx>
Cc: Shakeel Butt <shakeel.butt@xxxxxxxxx>
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Cc: Wei Liu <wei.liu@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/proc/meminfo.c | 2 ++
include/linux/mmzone.h | 1 +
mm/show_mem.c | 4 +++-
mm/vmstat.c | 1 +
4 files changed, 7 insertions(+), 1 deletion(-)
--- a/fs/proc/meminfo.c~meminfo-add-a-per-node-counter-for-balloon-drivers
+++ a/fs/proc/meminfo.c
@@ -162,6 +162,8 @@ static int meminfo_proc_show(struct seq_
show_val_kb(m, "Unaccepted: ",
global_zone_page_state(NR_UNACCEPTED));
#endif
+ show_val_kb(m, "Balloon: ",
+ global_node_page_state(NR_BALLOON_PAGES));
hugetlb_report_meminfo(m);
--- a/include/linux/mmzone.h~meminfo-add-a-per-node-counter-for-balloon-drivers
+++ a/include/linux/mmzone.h
@@ -224,6 +224,7 @@ enum node_stat_item {
#ifdef CONFIG_HUGETLB_PAGE
NR_HUGETLB,
#endif
+ NR_BALLOON_PAGES,
NR_VM_NODE_STAT_ITEMS
};
--- a/mm/show_mem.c~meminfo-add-a-per-node-counter-for-balloon-drivers
+++ a/mm/show_mem.c
@@ -260,6 +260,7 @@ static void show_free_areas(unsigned int
" pagetables:%lukB"
" sec_pagetables:%lukB"
" all_unreclaimable? %s"
+ " Balloon:%lukB"
"\n",
pgdat->node_id,
K(node_page_state(pgdat, NR_ACTIVE_ANON)),
@@ -285,7 +286,8 @@ static void show_free_areas(unsigned int
#endif
K(node_page_state(pgdat, NR_PAGETABLE)),
K(node_page_state(pgdat, NR_SECONDARY_PAGETABLE)),
- str_yes_no(pgdat->kswapd_failures >= MAX_RECLAIM_RETRIES));
+ str_yes_no(pgdat->kswapd_failures >= MAX_RECLAIM_RETRIES),
+ K(node_page_state(pgdat, NR_BALLOON_PAGES)));
}
for_each_populated_zone(zone) {
--- a/mm/vmstat.c~meminfo-add-a-per-node-counter-for-balloon-drivers
+++ a/mm/vmstat.c
@@ -1277,6 +1277,7 @@ const char * const vmstat_text[] = {
#ifdef CONFIG_HUGETLB_PAGE
"nr_hugetlb",
#endif
+ "nr_balloon_pages",
/* system-wide enum vm_stat_item counters */
"nr_dirty_threshold",
"nr_dirty_background_threshold",
_
Patches currently in -mm which might be from npache@xxxxxxxxxx are
meminfo-add-a-per-node-counter-for-balloon-drivers.patch
balloon_compaction-update-the-nr_balloon_pages-state.patch
hv_balloon-update-the-nr_balloon_pages-state.patch
xen-balloon-update-the-nr_balloon_pages-state.patch
