interfacing - SPI and I2C interface on Pi -

i going through article

under heading "real time performance constraints" talks constraints , says "this means should not expect real-time performance or real-time timing constraints such programs."

my questions are

1. what's solution of problem in pi's context. how can make part of kernel ?
2. how in other devices, mobile phones, such interfaces work in real-time.say applications , games designed using accelerometer on mobile phone reacts in real-time .

answer second question: depends on definition of "real time". think mean "there no guaranteed response time", in practice time "usually finite" - of order of ms. enough 99% of applications in gaming etc.