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xen: balloon: update the NR_BALLOON_PAGES state

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Update the NR_BALLOON_PAGES counter when pages are added to or removed
from the Xen balloon.

Link: https://lkml.kernel.org/r/20250314213757.244258-5-npache@redhat.com
Signed-off-by: Nico Pache <npache@redhat.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Cc: Alexander Atanasov <alexander.atanasov@virtuozzo.com>
Cc: Chengming Zhou <chengming.zhou@linux.dev>
Cc: David Hildenbrand <david@redhat.com>
Cc: Dexuan Cui <decui@microsoft.com>
Cc: Haiyang Zhang <haiyangz@microsoft.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Juegren Gross <jgross@suse.com>
Cc: Kanchana P Sridhar <kanchana.p.sridhar@intel.com>
Cc: K. Y. Srinivasan <kys@microsoft.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Nhat Pham <nphamcs@gmail.com>
Cc: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Stefano Stabellini <sstabellini@kernel.org>
Cc: Wei Liu <wei.liu@kernel.org>
Cc: Michael Kelley <mhklinux@outlook.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Nico Pache 2025-03-14 15:37:57 -06:00 committed by Andrew Morton
parent 02ec35963b
commit f6a09e6800
1 changed files with 4 additions and 0 deletions
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4
drivers/xen/balloon.c
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@ -157,6 +157,8 @@ static void balloon_append(struct page *page)
list_add(&page->lru, &ballooned_pages);
balloon_stats.balloon_low++;
}
inc_node_page_state(page, NR_BALLOON_PAGES);
wake_up(&balloon_wq);
}
@ -179,6 +181,8 @@ static struct page *balloon_retrieve(bool require_lowmem)
balloon_stats.balloon_low--;
__ClearPageOffline(page);
dec_node_page_state(page, NR_BALLOON_PAGES);
return page;
}