Re: [kvm-devel] QEMU PIC indirection patch for in-kernel APIC work

Avi Kivity
2007-04-10T08:19:52Z

Evgeniy Polyakov wrote:
> On Mon, Apr 09, 2007 at 04:38:18PM +0300, Avi Kivity (avi@qumranet.com) wrote:
>
>>> But I don't get this "we can enhance the kernel but not userspace" vibe
>>> 8(
>>>
>>>
>> I've been waiting for network aio since ~2003. If it arrives in the
>> next few days, I'm all for it; much more than kvm can use it
>> profitably. But I'm not going to write that interface myself.
>>
>
> Hmm, you missed at least two implementations of network aio in the
> previous year, and now with syslets we can have third one.
>

I meant, network aio in the mainline kernel. I am aware of the various
out-of-tree implementations.

> But it looks from this discussion, that it will not prevent from
> changing in-kernel driver - place a hook into skb allocation path and
> allocate data from opposing memory - get pages from another side and put
> them into fragments, then copy headers into skb->data.
>

I don't understand this (opposing memory, another side?). Can you
elaborate?

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