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

[chuckw@ieee.org]

Many thanks once again.

Chuck

On Sun, Aug 19, 2001 at 09:01:13PM +0200, Anders Peter Fugmann wrote:
> 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
>