linux-kernel - [PATCH v2 3/4] hv_balloon: update the NR_BALLOON

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Message-ID: <20250314213757.244258-4-npache@redhat.com>
Date: Fri, 14 Mar 2025 15:37:56 -0600
From: Nico Pache <npache@...hat.com>
To: linux-hyperv@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	xen-devel@...ts.xenproject.org,
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Subject: [PATCH v2 3/4] hv_balloon: update the NR_BALLOON_PAGES state

Update the NR_BALLOON_PAGES counter when pages are added to or
removed from the Hyper-V balloon.

Signed-off-by: Nico Pache <npache@...hat.com>
---
 drivers/hv/hv_balloon.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c
index fec2f18679e3..2b4080e51f97 100644
--- a/drivers/hv/hv_balloon.c
+++ b/drivers/hv/hv_balloon.c
@@ -1192,6 +1192,7 @@ static void free_balloon_pages(struct hv_dynmem_device *dm,
 		__ClearPageOffline(pg);
 		__free_page(pg);
 		dm->num_pages_ballooned--;
+		mod_node_page_state(page_pgdat(pg), NR_BALLOON_PAGES, -1);
 		adjust_managed_page_count(pg, 1);
 	}
 }
@@ -1221,6 +1222,7 @@ static unsigned int alloc_balloon_pages(struct hv_dynmem_device *dm,
 			return i * alloc_unit;
 
 		dm->num_pages_ballooned += alloc_unit;
+		mod_node_page_state(page_pgdat(pg), NR_BALLOON_PAGES, alloc_unit);
 
 		/*
 		 * If we allocatted 2M pages; split them so we
-- 
2.48.1