[RFC PATCH 2/2] arm64: Implement vmalloc based thread_info allocator

[Arnd Bergmann]

On Monday 25 May 2015 19:47:15 Catalin Marinas wrote:
> On 25 May 2015, at 13:01, Jungseok Lee <jungseoklee85 at gmail.com> wrote:
> 
> >> Could the stack size be reduced to 8KB perhaps?
> > 
> > I guess probably not.
> > 
> > A commit, 845ad05e, says that 8KB is not enough to cover SpecWeb benchmark.
> 
> We could go back to 8KB stacks if we implement support for separate IRQ 
> stack on arm64. It's not too complicated, we would have to use SP0 for (kernel) threads 
> and SP1 for IRQ handlers.

I think most architectures that see a lot of benchmarks have moved to
irqstacks at some point, that definitely sounds like a useful idea,
even if the implementation turns out to be a bit more tricky than
what you describe.

There are a lot of workloads that would benefit from having lower
per-thread memory cost.

	Arnd