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tracing/events: Add trace_event boot option

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We already have ftrace= boot option, and this adds a similar
boot option for trace events, so allow trace events to be
enabled at boot, for boot debugging purpose.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <4A4ACE29.3010407@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Li Zefan
2009-07-01 10:47:05 +08:00
committed by Ingo Molnar
parent c5cb5a2d8d
commit 020e5f85cb
5 changed files with 52 additions and 6 deletions
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4
kernel/trace/trace.c
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@@ -49,7 +49,7 @@ unsigned long __read_mostly tracing_thresh;
* On boot up, the ring buffer is set to the minimum size, so that
* we do not waste memory on systems that are not using tracing.
*/
static int ring_buffer_expanded;
int ring_buffer_expanded;
/*
* We need to change this state when a selftest is running.
@@ -63,7 +63,7 @@ static bool __read_mostly tracing_selftest_running;
/*
* If a tracer is running, we do not want to run SELFTEST.
*/
static bool __read_mostly tracing_selftest_disabled;
bool __read_mostly tracing_selftest_disabled;
/* For tracers that don't implement custom flags */
static struct tracer_opt dummy_tracer_opt[] = {