Commit 53e946cb authored Jan 07, 2019 by Wei Wang Committed by Michael S. Tsirkin Mar 06, 2019

virtio-balloon: improve update_balloon_size_func



There is no need to update the balloon actual register when there is no
ballooning request. This patch avoids update_balloon_size when diff is 0.

Signed-off-by: Wei Wang <wei.w.wang@intel.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Halil Pasic <pasic@linux.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

parent fd1068e1

drivers/virtio/virtio_balloon.c

+4 −1

Original line number	Diff line number	Diff line
		@@ -457,9 +457,12 @@ static void update_balloon_size_func(struct work_struct *work)
		update_balloon_size_work);
		diff = towards_target(vb);

		if (!diff)
		return;

		if (diff > 0)
		diff -= fill_balloon(vb, diff);
		else if (diff < 0)
		else
		diff += leak_balloon(vb, -diff);
		update_balloon_size(vb);

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