Re: DPC vs tasklet

[Jeff Garzik <jgarzik@pobox.com>]

Arjan van de Ven wrote:
> 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.

Agreed, presuming that the IO completion is fairly cheap.


> 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.

Agreed.

	Jeff