linux-kernel - Re: [PATCH 1/3] tracing/trace_stack: fix the number of entries in the header

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Date:	Wed, 3 Jun 2009 09:59:58 -0400 (EDT)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	walimis <walimisdev@...il.com>
cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] tracing/trace_stack: fix the number of entries in
 the header


On Wed, 3 Jun 2009, walimis wrote:

> The last entry in the stack_dump_trace is ULONG_MAX, which is not
> a valid entry, but max_stack_trace.nr_entries has accounted for it.
> So when printing the header, we should decrease it by one.
> Before fix, print as following, for example:
> 
> 	Depth    Size   Location    (53 entries)	<--- should be 52
> 	-----    ----   --------
>   0)     3264     108   update_wall_time+0x4d5/0x9a0
>   ...
>  51)       80      80   syscall_call+0x7/0xb
>  ^^^
>    it's correct.
> 
> Signed-off-by: walimis <walimisdev@...il.com>

This is one of those bugs I've been meaning to fix for a long time, but 
never got around to actually doing it. Thanks!

I'll queue this up.

-- Steve

> ---
>  kernel/trace/trace_stack.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c
> index 1796f00..2d7aebd 100644
> --- a/kernel/trace/trace_stack.c
> +++ b/kernel/trace/trace_stack.c
> @@ -265,7 +265,7 @@ static int t_show(struct seq_file *m, void *v)
>  		seq_printf(m, "        Depth    Size   Location"
>  			   "    (%d entries)\n"
>  			   "        -----    ----   --------\n",
> -			   max_stack_trace.nr_entries);
> +			   max_stack_trace.nr_entries - 1);
>  
>  		if (!stack_tracer_enabled && !max_stack_size)
>  			print_disabled(m);
> -- 
> 1.6.0.3
> 
> 
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