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ftrace: enable trace_printk by default 

Impact: have the ftrace_printk enabled on startup

It is confusing to have to "echo trace_printk > /debug/tracing/iter_ctrl"
after adding ftrace_printk in the kernel.

Currently the trace_printk is set to off by default. ftrace_printk
should only be in open kernel code when used for debugging, and thus
it should be enabled by default.

It may also be used to record data within a tracer, but those ftrace_printks
should be within wrappers that are either enabled by trace_points or
have a variable protecting the code path from being entered when the
tracer is disabled.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Steven Rostedt 2008-11-07 22:36:02 -05:00 committed by Ingo Molnar
parent 4519317020
commit 49833fc232
1 changed files with 1 additions and 1 deletions
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2
kernel/trace/trace.c
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@ -205,7 +205,7 @@ static DEFINE_MUTEX(trace_types_lock);
static DECLARE_WAIT_QUEUE_HEAD(trace_wait);
/* trace_flags holds iter_ctrl options */
unsigned long trace_flags = TRACE_ITER_PRINT_PARENT;
unsigned long trace_flags = TRACE_ITER_PRINT_PARENT | TRACE_ITER_PRINTK;
/**
* trace_wake_up - wake up tasks waiting for trace input