linux-kernel - Re: [PATCH 6/9] oprofile: port to the new ring

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Date:	Tue, 16 Dec 2008 01:37:25 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Robert Richter <robert.richter@....com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	oprofile-list <oprofile-list@...ts.sourceforge.net>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 6/9] oprofile: port to the new ring_buffer

On Thu, 11 Dec 2008 17:42:00 +0100 Robert Richter <robert.richter@....com> wrote:

> -static inline
> -struct op_sample *cpu_buffer_read_entry(struct oprofile_cpu_buffer *cpu_buf)
> +static inline struct op_sample *cpu_buffer_read_entry(int cpu)
>  {
> -	return &cpu_buf->buffer[cpu_buf->tail_pos];
> +	struct ring_buffer_event *e;
> +	e = ring_buffer_consume(op_ring_buffer_read, cpu, NULL);
> +	if (e)
> +		return ring_buffer_event_data(e);
> +	if (ring_buffer_swap_cpu(op_ring_buffer_read,
> +				 op_ring_buffer_write,
> +				 cpu))
> +		return NULL;
> +	e = ring_buffer_consume(op_ring_buffer_read, cpu, NULL);
> +	if (e)
> +		return ring_buffer_event_data(e);
> +	return NULL;
>  }

This file has some really large inlined functions.
cpu_buffer_read_entry() has three callsites..
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