On Tue, Mar 11, 2025 at 06:06:57PM -0600, Nico Pache wrote:
quoted hunk ↗ jump to hunk
Update the NR_BALLOON_PAGES counter when pages are added to or
removed from the virtio balloon.
Signed-off-by: Nico Pache <redacted>
---
drivers/virtio/virtio_balloon.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index 89da052f4f68..406414dbb477 100644
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -274,6 +274,8 @@ static unsigned int fill_balloon(struct virtio_balloon *vb, size_t num)
set_page_pfns(vb, vb->pfns + vb->num_pfns, page);
vb->num_pages += VIRTIO_BALLOON_PAGES_PER_PAGE;
+ mod_node_page_state(page_pgdat(page), NR_BALLOON_PAGES,
+ VIRTIO_BALLOON_PAGES_PER_PAGE);
if (!virtio_has_feature(vb->vdev,
VIRTIO_BALLOON_F_DEFLATE_ON_OOM))
adjust_managed_page_count(page, -1);
This means the counter is in virtio balloon page units, which
runs counter to the declared goal of making the interface
hypervisor-agnostic.
quoted hunk ↗ jump to hunk
@@ -324,6 +326,8 @@ static unsigned int leak_balloon(struct virtio_balloon *vb, size_t num)
set_page_pfns(vb, vb->pfns + vb->num_pfns, page);
list_add(&page->lru, &pages);
vb->num_pages -= VIRTIO_BALLOON_PAGES_PER_PAGE;
+ mod_node_page_state(page_pgdat(page), NR_BALLOON_PAGES,
+ -VIRTIO_BALLOON_PAGES_PER_PAGE);
Same.
Thanks,
}
num_freed_pages = vb->num_pfns;
--
2.48.1