Re: XFS, 4K stacks, and Red Hat

[Steve Lord <lord@xxxxxxx>]

Andi Kleen wrote:

> Eventually even 8k stack systems might run into problems.
>
> A generic way to solve this would be to let the block layer
> who calls into the various stacking layers check how much stack is left
> first  and when it is too low push the work to another thread using
> a workqueue.
>
> Jens, do you think that would be feasible?
>
> -Andi
Quick, before Adrian Bunk gets his patch to completely kill 8K stacks
into Linus's tree!

In a previous life I actually had to resort to allocating a chunk of
memory, linking it into the stack, then carrying on down the call
chain (not on linux). The memory was freed on the way up the stack
again. I am not saying that would be a viable solution, but there needs
to be something done about stack overflow and nested subsystems, before
someone tries iscsi over IPV6 or something other bizzare combo.

Steve