linux-kernel - Re: [RFC][PATCH 1/2] tracing/ftrace: syscall tracing infrastructure

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Date:	Mon, 9 Mar 2009 20:52:00 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Jiaying Zhang <jiayingz@...gle.com>,
	Martin Bligh <mbligh@...gle.com>
Subject: Re: [RFC][PATCH 1/2] tracing/ftrace: syscall tracing
 infrastructure



On Mon, 9 Mar 2009, Frederic Weisbecker wrote:

> On Mon, Mar 09, 2009 at 09:52:20AM -0400, Steven Rostedt wrote:
> > 
> > On Sat, 7 Mar 2009, Frederic Weisbecker wrote:
> > > +
> > > +
> > > +static atomic_t refcount;
> > > +
> > > +enum print_line_t
> > > +print_syscall_enter(struct trace_iterator *iter, int flags)
> > > +{
> > > +	struct trace_seq *s = &iter->seq;
> > > +	struct trace_entry *ent = iter->ent;
> > > +	struct syscall_trace_enter *trace;
> > > +	enum syscall_trace_nr syscall;
> > > +	const struct syscall_trace_entry *entry;
> > > +	char *str = NULL;
> > > +	int i, ret;
> > > +
> > > +	trace_assign_type(trace, ent);
> > > +
> > > +	syscall = trace->nr;
> > > +
> > > +	if (!syscall || syscall >= __SYSCALL_TRACE_END)
> > 
> > You still need to print a "\n" otherwise the output of the next line
> > will start on the current line.
> 
> Are you sure?
> This entry will be ignored. And the previous one did print a newline.
> So the next one should not have any problem.

Does this take over the printline? Otherwise we could be printing a 
header, (comm, timestamp, cpu, etc).

-- Steve
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