[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: some doubts on cache coherence

Hi Jim....

> when the BH work is done in a workqueue, is it typically the top half
> that does the enqueing, or is it usually a BH pump-primer ?

I am not sure what you really mean here....

> Sounds like do_softirqs() is the real BH pump-primer,
> and the registered softirq handlers would encqueue the work.
> close ?

Maybe. But IMHO, this is case by case answer. 

> Is there a recommended max for top-half execution time,
> instruction count, no-looping, asmlinkage, etc ?

I don't know.The basic rule I know are just "do it as fast as you can 
and defer as many as you can outside interrupt context" and "minimize 
lock contention"

regards

Mulyadi


--
Kernelnewbies: Help each other learn about the Linux kernel.
Archive:       http://mail.nl.linux.org/kernelnewbies/
FAQ:           http://kernelnewbies.org/faq/