Re: [PATCH RT 00/02] SLOB optimizations

[Eric Dumazet <dada1@cosmosbay.com>]

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
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