Re: possible spinlock optimizations
Momchil Velikov (velco@fadata.bg)
Tue, 28 Sep 1999 16:36:37 +0300
Manfred wrote:
>
> I think there are 2 possible optimizations for spinlocks:
> 1) spin_lock_irq(): What about enabling interrupts while spinning?
> CPU1 owns the spinlock, ie it runs with disabled interrupts.
> Now CPU2 tries to acquire the spinlock, it fails and it starts to spin.
> - while spinning, there are no atomicity requirements.
> - it would improve the interrupt responsiveness. Currently, both CPU's are
> waiting/running with disabled interrupts.
> - the change only affects the "slow path", it doesn't slow down the normal
> case.
How do you atomically-acquire-the-lock-and-disable-interrupts
(I assume we are talking about x86 here) ?
Regards,
-velco
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