linux.conf.au, January 2003
      PRINCIPLES: Multiple CPU Reference Table


 						       Soft Interrupts
 				User-	User-	Bottom	Tasklet	Softirq	IRQ
 				space	context	Half

 		Same one runs	No	No	No	No	Yes	No
 		simultaneously
 		on other CPU?

 		Same type runs	Yes	Yes	No	Yes	Yes	Yes
 		simultaneously
 		on other CPU?

 		Interrupted by
 		same type?	Yes	Yes*	No	No	No	No

 		Interrupted by	Yes	Yes	No	No	No	No
 		soft interrupts?

 		Interrupted by	Yes	Yes	Yes	Yes	Yes	No
 		hard interrupts?