[PATCH RFC V2 0/4] Adding tracepoints to vhost/net

[Jason Wang <jasowang@redhat.com>]

Recent debugging on vhost net zerocopy shows the need of
tracepoints. So to help in vhost{net} debugging and performance
analyzing, the following series adding basic tracepoints to
vhost. Operations of both vhost and vhost_net were traced in current
implementation.

A top-like satistics displaying script were introduced to help the
troubleshooting:
vhost statistics

 vhost_virtio_update_used_idx               1215215       0
 vhost_virtio_get_vq_desc                   1215215       0
 vhost_work_queue_wakeup                     986808       0
 vhost_virtio_signal                         811601       0
 vhost_net_tx                                611457       0
 vhost_net_rx                                603758       0
 vhost_net_tx(datacopy)                      601903       0
 vhost_work_queue_wakeup(rx_net)             565081       0
 vhost_virtio_signal(rx)                     461603       0
 vhost_work_queue_wakeup(tx_kick)            421718       0
 vhost_virtio_update_avail_event             417346       0
 vhost_virtio_signal(tx)                     349998       0
 vhost_work_queue_coalesce                    39384       0
 vhost_work_queue_coalesce(rx_net)            38677       0
 vhost_net_tx(zerocopy)                        9554       0
 vhost_work_queue_coalesce(tx_kick)             707       0
 vhost_work_queue_wakeup(rx_kick)                 9       0

TODO:
- performance test
- finalize which should be traced

Reference:
- V1: https://lkml.org/lkml/2012/4/9/478

Jason Wang (4):
  vhost: introduce queue_index for tracing
  vhost: basic tracepoints
  vhost_net: add basic tracepoints for vhost_net
  tools: virtio: add a top-like utility for displaying vhost satistics

 drivers/vhost/net.c       |   7 +
 drivers/vhost/net_trace.h |  53 +++++++
 drivers/vhost/trace.h     | 175 ++++++++++++++++++++++
 drivers/vhost/vhost.c     |  14 +-
 drivers/vhost/vhost.h     |   3 +
 tools/virtio/vhost_stat   | 375 ++++++++++++++++++++++++++++++++++++++++++++++
 6 files changed, 626 insertions(+), 1 deletion(-)
 create mode 100644 drivers/vhost/net_trace.h
 create mode 100644 drivers/vhost/trace.h
 create mode 100755 tools/virtio/vhost_stat

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1.8.3.2