User Space Tracing

* User Space Tracing
@ 2018-09-27 16:13 John O'Sullivan
  0 siblings, 0 replies; 9+ messages in thread
From: John O'Sullivan @ 2018-09-27 16:13 UTC (permalink / raw)
  To: lttng-dev

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I am really struggling trying to get user space tracing working predictably and consistently and would appreciate some help.

I created a trace event called

kvm_server:new_connection_tracepoint (see attached), I then use lttng-gen-tp to generate the .c and .h files which I link to the program and call with

tracepoint(kvm_server, new_connection_tracepoint, .................)

This appears predictably in my traces

However if I call my second tracepoint (see attached)

tracepoint(resolution_management, resolution_management_tracepoint,.......)

It never appears in any of the traces

I can see no significant difference between the two definitions.

I then created a third trace definition called simple_example (see attached)

tracepoint(simple_example, simple_example_tracepoint, .....)

This again appears in the trace

I start the tracing using

lttng enable-event -u -a      # enable user-space tracing

I then use babel trace to dump the trace,

'kvm_server' and 'simple_example' appear in the trace,  resolution_management does not.

Any idea why the resolution_management tracepoint does not appear in any traces or is there some way of debugging the tracecall macro itself?

regards

John

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[-- Attachment #2: connection_management_tp.tp --]
[-- Type: application/octet-stream, Size: 2100 bytes --]

TRACEPOINT_EVENT_CLASS(
    /* Tracepoint provider name */
    kvm_server,

    /* Tracepoint class name */
    connection_management_tracepoint_class,

/* Input arguments */
    TP_ARGS(
      int, connection_type,
      int, connection_id,
      int, slave_id,
      int, cm_connection_mode,
      const char *, connection_hostname
    ),

    /* Output event fields */
    TP_FIELDS(
	    ctf_integer(int, conn_type, connection_type)
	    ctf_integer(int, conn_id, connection_id)
	    ctf_integer(int, slave_id, slave_id)
        ctf_integer(int, cm_mode, cm_connection_mode)
	    ctf_string(hostname, connection_hostname)
    )
)

TRACEPOINT_EVENT_INSTANCE(
    kvm_server,
    connection_management_tracepoint_class,
    new_connection_tracepoint,
    TP_ARGS(
      int, connection_type,
      int, connection_id,
      int, slave_id,
      int, cm_connection_mode,
      const char *, connection_hostname
    )
)

TRACEPOINT_EVENT_INSTANCE(
    kvm_server,
    connection_management_tracepoint_class,
    connection_termination_tracepoint,
    TP_ARGS(
      int, connection_type,
      int, connection_id,
      int, slave_id,
      int, cm_connection_mode,
      const char *, connection_hostname
    )
)

TRACEPOINT_EVENT_INSTANCE(
    kvm_server,
    connection_management_tracepoint_class,
    connection_client_ready_tracepoint,
    TP_ARGS(
      int, connection_type,
      int, connection_id,
      int, slave_id,
      int, cm_connection_mode,
      const char *, connection_hostname
    )
)

TRACEPOINT_EVENT_INSTANCE(
    kvm_server,
    connection_management_tracepoint_class,
    connection_server_peer_ready_tracepoint,
    TP_ARGS(
      int, connection_type,
      int, connection_id,
      int, slave_id,
      int, cm_connection_mode,
      const char *, connection_hostname
    )
)

TRACEPOINT_EVENT_INSTANCE(
    kvm_server,
    connection_management_tracepoint_class,
    connection_info_tracepoint,
    TP_ARGS(
      int, connection_type,
      int, connection_id,
      int, slave_id,
      int, cm_connection_mode,
      const char *, connection_hostname
    )
)

[-- Attachment #3: resolution_management_tp.tp --]
[-- Type: application/octet-stream, Size: 1568 bytes --]

TRACEPOINT_EVENT_CLASS(
    /* Tracepoint provider name */
    resolution_management,

    /* Tracepoint class name */
    resolution_management_tracepoint_class,

/* Input arguments */
    TP_ARGS(
      int, connection_type,
      int, connection_pid,
      int, slave_id,
      int, cm_connection_mode,
      const char *, connection_hostname,
      int, width,
      int, height,
      int, refresh,
      int, sync_loss

    ),

    /* Output event fields */
    TP_FIELDS(
	    ctf_integer(int, conn_type, connection_type)
	    ctf_integer(int, conn_id, connection_pid)
	    ctf_integer(int, slave_id, slave_id)
        ctf_integer(int, cm_mode, cm_connection_mode)
	    ctf_string(hostname, connection_hostname)
		ctf_integer(int, width, width)
		ctf_integer(int, height, height)
		ctf_integer(int, refresh, refresh)
	    ctf_integer(int, sync_loss, sync_loss)

    )
)

TRACEPOINT_EVENT_INSTANCE(
    resolution_management,
    resolution_management_tracepoint_class,
    resolution_management_tracepoint,
    TP_ARGS(
      int, connection_type,
      int, connection_pid,
      int, slave_id,
      int, cm_connection_mode,
      const char *, connection_hostname,
      int, width,
      int, height,
      int, refresh

    )
)

TRACEPOINT_EVENT_INSTANCE(
    resolution_management,
    resolution_management_tracepoint_class,
    sync_loss_tracepoint,
    TP_ARGS(
      int, connection_type,
      int, connection_pid,
      int, slave_id,
      int, cm_connection_mode,
      const char *, connection_hostname,
      int, sync_loss

    )
)

[-- Attachment #4: simple_trace_tp.tp --]
[-- Type: application/octet-stream, Size: 798 bytes --]

TRACEPOINT_EVENT_CLASS(
    /* Tracepoint provider name */
    simple_example,

    /* Tracepoint class name */
    simple_example_tracepoint_class,

/* Input arguments */
    TP_ARGS(
      int, connection_type,
      int, connection_pid

    ),

    /* Output event fields */
    TP_FIELDS(
	    ctf_integer(int, conn_type, connection_type)
	    ctf_integer(int, conn_id, connection_pid)

    )
)

TRACEPOINT_EVENT_INSTANCE(
    simple_example,
    simple_example_tracepoint_class,
    simple_example_tracepoint,
    TP_ARGS(
      int, connection_type,
      int, connection_pid

    )
)

TRACEPOINT_EVENT_INSTANCE(
    simple_example,
    simple_example_tracepoint_class,
    second_simple_example_tracepoint,
    TP_ARGS(
      int, connection_type,
      int, connection_pid
    )
)

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