linux-kernel - Re: [patch 6/7] cpusets: per cpuset dirty ratios

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Message-Id: <1225356285.7803.7.camel@twins>
Date:	Thu, 30 Oct 2008 09:44:45 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Nick Piggin <npiggin@...e.de>, Paul Menage <menage@...gle.com>,
	Derek Fults <dfults@....com>, linux-kernel@...r.kernel.org
Subject: Re: [patch 6/7] cpusets: per cpuset dirty ratios

On Tue, 2008-10-28 at 09:08 -0700, David Rientjes wrote:

> +/*
> + * Determine the dirty ratios for the currently active cpuset
> + */
> +void cpuset_get_current_dirty_ratios(int *background, int *throttle)
> +{
> +	mutex_lock(&callback_mutex);
> +	task_lock(current);
> +	*background = task_cs(current)->dirty_background_ratio;
> +	*throttle = task_cs(current)->cpuset_dirty_ratio;
> +	task_unlock(current);
> +	mutex_unlock(&callback_mutex);
> +
> +	if (*background == -1)
> +		*background = dirty_background_ratio;
> +	if (*throttle == -1)
> +		*throttle = vm_dirty_ratio;
> +}

That's rather an awful lot of locking to read just two integers.


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