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
--
1.8.3.2
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