Re: top stack (l)users for 2.5.69

Jonathan Lundell
2003-05-08T20:48:20Z

At 3:05pm -0400 5/8/03, Timothy Miller wrote:
>My suggestion would be that if we do manage to get typical stack
>usage down to the point where we can go to a 4K stack, then
>interrupt handlers would have to be rewritten to recognize whether
>or not the interrupt arrived on a user process kernel stack and then
>move the context over to the "interrupt stack". The overhead would
>be low enough that it's worth doing so that we could reduce process
>kernel stack size. Whenever an interrupt service routine is itself
>interrupted, the interrupt stack check code would realize that it is
>already using the interrupt stack and not move the context. Here,
>then, we would need only one single interrupt stack which we would
>size for worst case; so if we made it 8 or 12K, that's 8 or 12K once
>for each CPU which is allowed to receive interrupts, not once per
>process.
>
>You like? :)

It makes sense to me. But this thread has gone in a circle, I think.

At 9:20am -0700 5/7/03, Martin J. Bligh wrote:
>There are patches to make i386 do this (and use 4K stacks as a config option)
>from Dave Hansen and Ben LaHaise in 2.5-mjb tree.

(the message context was a separate interrupt stack)
--
/Jonathan Lundell.