Re: [PATCH RT 00/02] SLOB optimizations

Eric Dumazet
2005-12-22T22:08:19Z

Ingo Molnar a écrit :
>
> CLI/STI is extremely fast. (In fact in the -rt tree i'm using them
> within mutexes instead of preempt_enable()/preempt_disable(), because
> they are faster and generate less register side-effect.)
>

Yes, but most of my machines have a ! CONFIG_PREEMPT kernel, so
preempt_enable()/preempt_disable() are empty, thus faster than CLI/STI for sure :)

Then, maybe the patch that moves 'current' in a dedicated x86_64 register may
help to lower the cost of preempt_enable()/preempt_disable() on a
CONFIG_PREEMPT kernel ?

Eric