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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>
This commit is contained in:
Paolo Bonzini 2017-06-01 15:54:47 +02:00 committed by Michael S. Tsirkin
parent f811f97040
commit b0ac429f13
2 changed files with 2 additions and 0 deletions
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1
hw/virtio/trace-events
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@ -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"

1
hw/virtio/virtio.c
View File

@ -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;