Commit b0ac429f authored by Paolo Bonzini's avatar Paolo Bonzini Committed by Michael S. Tsirkin
Browse files

virtio: add virtqueue_alloc_element tracepoint 



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

Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Reviewed-by: default avatarMichael S. Tsirkin <mst@redhat.com>
Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent f811f970

hw/virtio/trace-events

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# 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"

hw/virtio/virtio.c

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@@ -815,6 +815,7 @@ 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;