Messages in this thread | | | Subject | Re: [PATCH V2 0/6][RFC] futex: FUTEX_LOCK with optional adaptive spinning | From | Peter Zijlstra <> | Date | Tue, 06 Apr 2010 16:09:08 +0200 |
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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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