From: "George Spelvin" <linux@horizon.com>
To: linux-kernel@vger.kernel.org, peterz@infradead.org
Cc: linux@horizon.com
Subject: Re: [PATCH 1/6] mlock: only hold mmap_sem in shared mode when
Date: 10 Dec 2010 14:00:47 -0500 [thread overview]
Message-ID: <20101210190047.11069.qmail@science.horizon.com> (raw)
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.
reply other threads:[~2010-12-10 19:07 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
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