Commit 7e6ea92d authored by Frederic Weisbecker's avatar Frederic Weisbecker Committed by Ingo Molnar

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
itself.

And unlike other tracers that trigger specific traces periodically,
nop triggers no traces by itself that can wake him.
Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <1237759847-21025-5-git-send-email-fweisbec@gmail.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 07edf712
...@@ -91,6 +91,7 @@ struct tracer nop_trace __read_mostly = ...@@ -91,6 +91,7 @@ struct tracer nop_trace __read_mostly =
.name = "nop", .name = "nop",
.init = nop_trace_init, .init = nop_trace_init,
.reset = nop_trace_reset, .reset = nop_trace_reset,
.wait_pipe = poll_wait_pipe,
#ifdef CONFIG_FTRACE_SELFTEST #ifdef CONFIG_FTRACE_SELFTEST
.selftest = trace_selftest_startup_nop, .selftest = trace_selftest_startup_nop,
#endif #endif
......
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