Re: Looking for comments on Bottom-Half/Tasklet/SoftIRQ

[Anders Peter Fugmann <afu@fugmann.dhs.org>]

chuckw@ieee.org wrote:
> Thanks
> 
> 	So, Bottom halves don't need to be re-entrant as do tasklets.  SoftIRQ's
> need to be re-entrant.  The advantage of tasklets is that each tasklet can
> be farmed out to different CPU's AND they don't need to be re-entrant 
> because only one instance is allowed at a time.  I think I got it.

That is 100% correct.

> 
> 	Could you direct me to some code in the kernel which uses tasklets
> so I can see the inner workings?

Actually very few systems in the kernel has been rewritten to use 
tasklets instead og BH's.

But as they are very simillar to BH's, you should be able to use the 
same thinking, its just a new API.

Take a look at include/linux/interrupt.h
(or http://lxr.linux.no/source/include/linux/interrupt.h, an invaluable 
source when coding for linux).

Regards
Anders Fugmann