The patch titled
Subject: balloon_compaction: update the NR_BALLOON_PAGES state
has been added to the -mm mm-unstable branch. Its filename is
balloon_compaction-update-the-nr_balloon_pages-state.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/balloon_compaction-update-the-nr_balloon_pages-state.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: balloon_compaction: update the NR_BALLOON_PAGES state
Date: Fri, 14 Mar 2025 15:37:55 -0600
Update the NR_BALLOON_PAGES counter when pages are added or removed using
the balloon compaction interface.
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.
Link: https://lkml.kernel.org/r/20250314213757.244258-3-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>
---
mm/balloon_compaction.c | 2 ++
1 file changed, 2 insertions(+)
--- a/mm/balloon_compaction.c~balloon_compaction-update-the-nr_balloon_pages-state
+++ a/mm/balloon_compaction.c
@@ -24,6 +24,7 @@ static void balloon_page_enqueue_one(str
balloon_page_insert(b_dev_info, page);
unlock_page(page);
__count_vm_event(BALLOON_INFLATE);
+ inc_node_page_state(page, NR_BALLOON_PAGES);
}
/**
@@ -103,6 +104,7 @@ size_t balloon_page_list_dequeue(struct
__count_vm_event(BALLOON_DEFLATE);
list_add(&page->lru, pages);
unlock_page(page);
+ dec_node_page_state(page, NR_BALLOON_PAGES);
n_pages++;
}
spin_unlock_irqrestore(&b_dev_info->pages_lock, flags);
_
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
