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    Subject[tip:tracing/filters] tracing/ftrace: make nop-tracer use polling wait for events on pipe
    Commit-ID:  7e6ea92df3fd7cbe74e7985c6f3e40255c44b201
    Author: Frederic Weisbecker <>
    AuthorDate: Sun, 22 Mar 2009 23:10:47 +0100
    Committer: Ingo Molnar <>
    CommitDate: Mon, 23 Mar 2009 09:22:15 +0100

    tracing/ftrace: make nop-tracer use polling wait for events on pipe

    Impact: display events when they arrive

    Now that the events don't use wake_up() anymore, we need the nop
    tracer to poll waiting for events on the pipe. Especially because
    nop is useful to look at orphan traces types (traces types that
    don't rely on specific tracers) because it doesn't produce traces

    And unlike other tracers that trigger specific traces periodically,
    nop triggers no traces by itself that can wake him.

    Signed-off-by: Frederic Weisbecker <>
    Cc: Steven Rostedt <>
    LKML-Reference: <>
    Signed-off-by: Ingo Molnar <>

    kernel/trace/trace_nop.c | 1 +
    1 files changed, 1 insertions(+), 0 deletions(-)

    diff --git a/kernel/trace/trace_nop.c b/kernel/trace/trace_nop.c
    index 9aa84bd..394f944 100644
    --- a/kernel/trace/trace_nop.c
    +++ b/kernel/trace/trace_nop.c
    @@ -91,6 +91,7 @@ struct tracer nop_trace __read_mostly =
    .name = "nop",
    .init = nop_trace_init,
    .reset = nop_trace_reset,
    + .wait_pipe = poll_wait_pipe,
    .selftest = trace_selftest_startup_nop,

     \ /
      Last update: 2009-03-23 09:35    [W:0.020 / U:7.656 seconds]
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