linux-kernel - Re: [PATCH 1/3] ring-buffer: add counters for commit overrun and nmi dropped entries

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Message-Id: <20090430200034.fb794702.akpm@linux-foundation.org>
Date:	Thu, 30 Apr 2009 20:00:34 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH 1/3] ring-buffer: add counters for commit overrun and
 nmi dropped entries

On Thu, 30 Apr 2009 22:22:11 -0400 Steven Rostedt <rostedt@...dmis.org> wrote:

> +unsigned long ring_buffer_nmi_dropped_cpu(struct ring_buffer *buffer, int cpu)
> +{
> +	struct ring_buffer_per_cpu *cpu_buffer;
> +	unsigned long ret;
> +
> +	if (!cpumask_test_cpu(cpu, buffer->cpumask))
> +		return 0;
> +
> +	cpu_buffer = buffer->buffers[cpu];
> +	ret = cpu_buffer->nmi_dropped;
> +
> +	return ret;
> +}
> +EXPORT_SYMBOL_GPL(ring_buffer_nmi_dropped_cpu);
> +
> +/**
> + * ring_buffer_commit_overrun_cpu - get the number of overruns caused by commits
> + * @buffer: The ring buffer
> + * @cpu: The per CPU buffer to get the number of overruns from
> + */
> +unsigned long
> +ring_buffer_commit_overrun_cpu(struct ring_buffer *buffer, int cpu)
> +{
> +	struct ring_buffer_per_cpu *cpu_buffer;
> +	unsigned long ret;
> +
> +	if (!cpumask_test_cpu(cpu, buffer->cpumask))
> +		return 0;
> +
> +	cpu_buffer = buffer->buffers[cpu];
> +	ret = cpu_buffer->commit_overrun;
> +
> +	return ret;
> +}

hm.  Four functions in a row, all of which differ in but a single line.

unsigned long
ring_buffer_commit_overrun_cpu(struct ring_buffer *buffer, int cpu)
{
	return some_common_function(buffer, cpu)->commit_overrun;
}

?

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