linux-kernel - Re: [PATCH] nfs: fix congestion control -v4

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Message-Id: <20070125210245.3fb0e30e.akpm@osdl.org>
Date:	Thu, 25 Jan 2007 21:02:45 -0800
From:	Andrew Morton <akpm@...l.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Trond Myklebust <trond.myklebust@....uio.no>,
	Christoph Lameter <clameter@....com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, pj@....com
Subject: Re: [PATCH] nfs: fix congestion control -v4

On Thu, 25 Jan 2007 16:32:28 +0100
Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:

> +long congestion_wait_interruptible(int rw, long timeout)
> +{
> +	long ret;
> +	DEFINE_WAIT(wait);
> +	wait_queue_head_t *wqh = &congestion_wqh[rw];
> +
> +	prepare_to_wait(wqh, &wait, TASK_INTERRUPTIBLE);
> +	if (signal_pending(current))
> +		ret = -ERESTARTSYS;
> +	else
> +		ret = io_schedule_timeout(timeout);
> +	finish_wait(wqh, &wait);
> +	return ret;
> +}
> +EXPORT_SYMBOL(congestion_wait_interruptible);

I think this can share code with congestion_wait()?

static long __congestion_wait(int rw, long timeout, int state)
{
	long ret;
	DEFINE_WAIT(wait);
	wait_queue_head_t *wqh = &congestion_wqh[rw];

	prepare_to_wait(wqh, &wait, state);
	ret = io_schedule_timeout(timeout);
	finish_wait(wqh, &wait);
	return ret;
}

long congestion_wait_interruptible(int rw, long timeout)
{
	long ret = __congestion_wait(rw, timeout);

	if (signal_pending(current))
		ret = -ERESTARTSYS;
	return ret;
}

it's only infinitesimally less efficient..
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