Re: [PATCH 00/27] Latest numa/core release, v16

[Ingo Molnar]

* Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:

> [...] And not look at vsyscalls or anything, but look at what 
> schednuma does wrong!

I have started 4 independent lines of inquiry to figure out 
what's wrong on David's system, and all four are in the category 
of 'what does our tree do to cause a regression':

  - suboptimal (== regressive) 4K fault handling by numa/core

  - suboptimal (== regressive) placement by numa/core on David's 
    assymetric-topology system

  - vsyscalls escallating numa/core page fault overhead
    non-linearly

  - TLB flushes escallating numacore page fault overhead
    non-linearly

I have sent patches for 3 of them, one is still work in 
progress, because it's non-trivial.

I'm absolutely open to every possibility and obviously any 
regression is numa/core's fault, full stop.

What would you have done differently to handle this particular 
regression?

Thanks,

	Ingo
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