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authorFrederic Weisbecker <fweisbec@gmail.com>2009-03-22 23:10:47 +0100
committerIngo Molnar <mingo@elte.hu>2009-03-23 09:22:15 +0100
commit7e6ea92df3fd7cbe74e7985c6f3e40255c44b201 (patch)
tree129b5ef0092098003c582c8192c795c8de5599df
parent07edf7121374609709ef1b0889f6e7b8d6a62ec1 (diff)
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: Frederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <1237759847-21025-5-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--kernel/trace/trace_nop.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/trace/trace_nop.c b/kernel/trace/trace_nop.c
index 9aa84bde23c..394f94417e2 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,
#ifdef CONFIG_FTRACE_SELFTEST
.selftest = trace_selftest_startup_nop,
#endif