[RFC PATCH v5 5/8] drivers: virtio: balloon - report inflated memory

From: Alexander Atanasov
Date: Wed Oct 19 2022 - 07:30:46 EST


Update the inflated memory in the mm core when it changes.

Signed-off-by: Alexander Atanasov <alexander.atanasov@xxxxxxxxxxxxx>
---
drivers/virtio/virtio_balloon.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
index d0c27c680721..e9c3642eef17 100644
--- a/drivers/virtio/virtio_balloon.c
+++ b/drivers/virtio/virtio_balloon.c
@@ -450,10 +450,15 @@ static void virtballoon_changed(struct virtio_device *vdev)
static void update_balloon_size(struct virtio_balloon *vb)
{
u32 actual = vb->num_pages;
+ long inflated_kb = actual << (VIRTIO_BALLOON_PFN_SHIFT - 10);

/* Legacy balloon config space is LE, unlike all other devices. */
virtio_cwrite_le(vb->vdev, struct virtio_balloon_config, actual,
&actual);
+ if (virtio_has_feature(vb->vdev, VIRTIO_BALLOON_F_DEFLATE_ON_OOM))
+ balloon_set_inflated_free(inflated_kb);
+ else
+ balloon_set_inflated_total(inflated_kb);
}

static void update_balloon_stats_func(struct work_struct *work)
--
2.31.1