Re: DPC vs tasklet

[Arjan van de Ven <arjanv@redhat.com>]

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On Thu, 2004-05-20 at 18:52, Infante, Jon wrote:
> Christoph,
> 
> I was going to take your advice:
> "usage of tasklet itself is questionable, you probably want a kernel-thread"

well there's a few angles here:
1) For IO completion (eg the common, fastpath case), you don't want to
use a tasklet OR kernel-thread, just do the completion right there and
then in the ISR, since the scsi layer completion handler you call will
queue it for real work, the final completion, by the scsi softirq
already.

2) For management work, I can see the point of doing it in a
kernel-thread, since it's 1) rare (eg slowpath) 2) complex 3) code that
might want long-ish delays or allocate memory, neither of which you want
in irq context.




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