Re: Why no interrupt priorities?

Christoph Hellwig
2004-02-27T12:04:37Z

On Thu, Feb 26, 2004 at 11:05:07AM -0800, Tim Bird wrote:
> What's the rationale for not supporting interrupt priorities
> in the kernel?

What do you actually want to do them? Linux doesn't do the traditional
unix spl scheme for coplexity and performance reasons, see

www.usenix.org/publications/library/proceedings/ana97/full_papers/small/small.ps

for a related paper. Give that linux hardirq handlers should be very small
there's no performance gain in that area for sane architectures, too.