linux-kernel - Re: [PATCH tip 1/1] ring_buffer: pahole struct ring

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Date:	Wed, 11 Feb 2009 13:22:36 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Arnaldo Carvalho de Melo <acme@...hat.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH tip 1/1] ring_buffer: pahole struct ring_buffer


* Arnaldo Carvalho de Melo <acme@...hat.com> wrote:

> Hi,
> 
> While fixing some bugs in pahole (built-in.o files were not being
> processed due to relocation problems) I found out about these packable
> structures:
> 
> $ pahole --packable kernel/trace/ring_buffer.o  | grep ring
> ring_buffer	72	64	8
> ring_buffer_per_cpu	112	104	8

>  ring_buffer.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
> index 53ba3a6..27ef3bf 100644
> --- a/kernel/trace/ring_buffer.c
> +++ b/kernel/trace/ring_buffer.c
> @@ -273,8 +273,8 @@ struct ring_buffer {
>  	unsigned			pages;
>  	unsigned			flags;
>  	int				cpus;
> -	cpumask_var_t			cpumask;
>  	atomic_t			record_disabled;
> +	cpumask_var_t			cpumask;

Applied to tip:tracing/ring-buffer, thanks Arnaldo!

Is there anything packable in core kernel structures like task struct?

	Ingo
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