Re: [PATCH V2 0/6][RFC] futex: FUTEX_LOCK with optional adaptivespinning
From: Peter Zijlstra
Date: Tue Apr 06 2010 - 10:09:21 EST
On Tue, 2010-04-06 at 16:41 +0300, Avi Kivity wrote:
> On 04/06/2010 04:35 PM, Peter Zijlstra wrote:
> > On Tue, 2010-04-06 at 16:28 +0300, Avi Kivity wrote:
> >> Yes, but that's the best case for spinning. You could simply use a
> >> userspace spinlock in this case.
> > Userspace spinlocks are evil.. they should _never_ be used.
> But in this case they're fastest. If we don't provide a non-evil
> alternative, people will use them.
That's what FUTEX_LOCK is about.
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