linux-kernel - Re: [PATCH 2/3] ftrace: Add debug_print trace to print data from kernel to userspace

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Date:	Sun, 16 Nov 2008 16:19:04 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Frédéric Weisbecker <fweisbec@...il.com>
Cc:	rostedt@...dmis.org, mingo@...e.hu, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] ftrace: Add debug_print trace to print data from
	kernel to userspace

On Fri, Nov 14, 2008 at 03:39:29PM +0100, Frédéric Weisbecker wrote:
> 2008/11/14 Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>:
> > We also want to make sure dp_printk doesn't do anything when tracer
> > is disabled. We do
> >
> > int do_dp_printk(const char *fmt, ...)
> > {
> >        int ret;
> >        va_list args;
> >
> >        if (!tracer_enabled)
> >                return 0;
> 
> 
> In this case you just have to do
> echo 0 > /debug/tracing/tracing_enabled
> And the entries will not be printed anymore....

That would prevent us to have both dp_printk and debug_dump
used at the same time. Both will them depend on the tracer_enabled
flag. That means the output of these call will also interact with
rest of the tracer output.

-aneesh
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