linux-kernel - Re: [PATCH 1/6] mlock: only hold mmap

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Date:	10 Dec 2010 14:00:47 -0500
From:	"George Spelvin" <linux@...izon.com>
To:	linux-kernel@...r.kernel.org, peterz@...radead.org
Cc:	linux@...izon.com
Subject: Re: [PATCH 1/6] mlock: only hold mmap_sem in shared mode when

How about (bugfixed):

bool cond_break_mutex(struct mutex *mutex)
{
	if (!mutex_is_contended(mutex))
		return false;
	mutex_unlock(mutex);
	mutex_lock(mutex);
	return true;
}

It would be possible to share work between the unlock and lock slowpaths
(particularly the wait_lock acquisition), but that's probably more
maintenance effort than it's worth.
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