Re: [PATCH 8/13] KVM: vcpu execution loop

[Avi Kivity]

Antonio Vargas wrote:
> > I could do that, but I feel that's more brittle.  I might need more (or
> > other) fields later on.  It will also cost me more  pushes on the stack
> > (no real performance or space impact, just C64-era frugality).
>
> maybe thats the mindsent needed to make these virtual cpu patches
> without eating away all the cpu power with more than needed
> abstractions ;)

Unfortunately not.  Saving a cycle or two doesn't help when a vm exit 
costs thousands of cycles, and worse, kills your tlb.

The key is eliminating unnecessary exits.  I have plans for massively 
optimizing the mmu virtualization, and the next AMD core will do that in 
hardware (look for a "nested page tables" sticker before you buy).

--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/