* Nick Piggin <[email protected]> wrote:
> Well, yes. There are lots of things Linux isn't suited for. There are
> likewise a lot of patches that SGI would love to get into the kernel
> so it runs better on their 500+ CPU systems. [...]
this reminds me. PREEMPT_RT found a handful of SMP races that not even
100+ CPU systems triggered in any deterministic way.
(I have mentioned this before but it seems worth repeating: the
preemption model of PREEMPT_RT is similar to a SMP Linux kernel running
on an system that has an 'infinite' number of CPUs. Each task can be
thought of having its own separate CPU - and SMP-alike instruction
overlap can happen at any instruction boundary.)
So the very small meets (and helps) the very large in interesting ways.
PREEMPT_RT very much depends on a good SMP implementation and on a good
CONFIG_PREEMPT implementation. The synergies are much wider than just
enabling deterministic behavior in embedded systems.
Ingo
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