On Mon, Jul 16, 2007 at 11:26:46AM +0200, Ingo Molnar wrote:
>
> * Nick Piggin <[email protected]> wrote:
>
> > [...] trylock is more significantly slower, but they are relatively
> > rare.
>
> trylock is the main thing that the spinlock debugging code uses, and
> SPINLOCK_DEBUG is frequently enabled by distro kernels. OTOH, the cost
> looks like to be +5 instructions, right? Still ...
Which trylocks do you mean? The lockbreak spinlocks use trylock, but
those are not used with the ticket version.
I wouldn't be against adding an option between either of the lock
types, if there was value in it. But I would like to default ticket
locks to "y", at least in -rc kernels, in order to see if performance
goes down anywhere.
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