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[Qemu-trivial] [PATCH] virtio: add virtqueue_alloc_element tracepoint

From: Paolo Bonzini
Subject: [Qemu-trivial] [PATCH] virtio: add virtqueue_alloc_element tracepoint
Date: Thu, 1 Jun 2017 15:54:47 +0200

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

Signed-off-by: Paolo Bonzini <address@hidden>
 hw/virtio/trace-events | 1 +
 hw/virtio/virtio.c     | 1 +
 2 files changed, 2 insertions(+)

diff --git a/hw/virtio/trace-events b/hw/virtio/trace-events
index 1f7a7c1ae1..e24d8fa997 100644
--- a/hw/virtio/trace-events
+++ b/hw/virtio/trace-events
@@ -1,6 +1,7 @@
 # See docs/tracing.txt for syntax documentation.
 # hw/virtio/virtio.c
+virtqueue_alloc_element(void *elem, size_t sz, unsigned in_num, unsigned 
out_num) "elem %p size %zd in_num %u out_num %u"
 virtqueue_fill(void *vq, const void *elem, unsigned int len, unsigned int idx) 
"vq %p elem %p len %u idx %u"
 virtqueue_flush(void *vq, unsigned int count) "vq %p count %u"
 virtqueue_pop(void *vq, void *elem, unsigned int in_num, unsigned int out_num) 
"vq %p elem %p in_num %u out_num %u"
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 890b4d7eb7..286446b261 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -816,6 +816,7 @@ static void *virtqueue_alloc_element(size_t sz, unsigned 
out_num, unsigned in_nu
     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;

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