Subject: Re: Interrupt, interrupt threads, continuations, and kernel lwps
To: Andrew Doran <email@example.com>
From: Jason Thorpe <firstname.lastname@example.org>
Date: 02/21/2007 10:05:00
On Feb 21, 2007, at 2:09 AM, Andrew Doran wrote:
> Conversely, the changes I have to handle
> interrupts using LWPs add 29 instructions to a typical interrupt
> chain on
> x86, to swap stack and curlwp. It works, and it's a solution that
> can just
> be "dropped in".
The problem is I don't think it CAN be "dropped in" on a platform like
VAX, m68k, or SPARC. It's easy on x86 because of how simple its
interrupt model is. But I don't think that's true on platforms that
have processor-defined interrupt levels and auto-vectored interrupts.