commit b0ac429f1346e9fa13206d748bedc9bd497a55bc
author Paolo Bonzini <pbonzini@redhat.com> Thu Jun 01 15:54:47 2017 +0200
committer Michael S. Tsirkin <mst@redhat.com> Fri Jun 02 18:57:17 2017 +0300
tree 49702182aaf9732f140f7f8c48384938e9304664
parent f811f97040a48358b456b46ecbc9167f0131034f

virtio: add virtqueue_alloc_element tracepoint

This tracepoint can help diagnosing failures due to memory
fragmentation in the guest.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/virtio/virtio.c

diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index f99d99f..464947f 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -815,6 +815,7 @@
 
     assert(sz >= sizeof(VirtQueueElement));
     elem = g_malloc(out_sg_end);
+    trace_virtqueue_alloc_element(elem, sz, in_num, out_num);
     elem->out_num = out_num;
     elem->in_num = in_num;
     elem->in_addr = (void *)elem + in_addr_ofs;