linux-kernel - Re: [PATCH 0/3] tracing/function-graph-tracer: signal interrupt triggering on output

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Date:	Sat, 13 Dec 2008 16:22:25 +0100
From:	"Frédéric Weisbecker" <fweisbec@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Steven Rostedt" <rostedt@...dmis.org>,
	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>,
	"Linux Kernel" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/3] tracing/function-graph-tracer: signal interrupt triggering on output

2008/12/13 Ingo Molnar <mingo@...e.hu>:
> Another thing, i just noticed that ftrace_print() is broken in certain
> situations, for example a plain newline:
>
>        ftrace_printk("\n");
>
> printed via trace_pipe will print some weirdly concatenated line:
>
>           <...>-2994  [007]   406.498986: debug_show:          <...>-2994  [007]   406.498986:            <...>-2994  [007]   406.498986: debug_show:
>
> not via a separate, standalone, empty line.

I just tested with latest -tip and I don't any problem with it.
With a single ftrace_printk("\n") on might_sleep() I get:

           <...>-2739  [000]   145.692153: __might_sleep:
           <...>-2739  [000]   145.692155: __might_sleep:
           <...>-2739  [000]   145.692157: __might_sleep:
           <...>-2739  [000]   145.692158: __might_sleep:

with trace or trace_iter file.
Does it always occur or in rare situations?
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