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From: Marcin Slusarz on 27 Jul 2010 18:50
Currently we rely on other code periodically waking up trace reader.
If there aren't any other data than markers, reader will never be woken up.
Fix it.

Signed-off-by: Marcin Slusarz <marcin.slusarz(a)gmail.com>
Cc: Steven Rostedt <rostedt(a)goodmis.org>
Cc: Frederic Weisbecker <fweisbec(a)gmail.com>
Cc: Ingo Molnar <mingo(a)redhat.com>
---
kernel/trace/trace.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 086d363..02e04c8 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1520,6 +1520,7 @@ int trace_array_vprintk(struct trace_array *tr,
if (!filter_check_discard(call, entry, buffer, event)) {
ring_buffer_unlock_commit(buffer, event);
ftrace_trace_stack(buffer, irq_flags, 6, pc);
+ trace_wake_up();
}

out_unlock:
--
1.7.1.1

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