Re: [Xen-ia64-devel] RE: SMP-g design notes

[Tristan Gingold <Tristan.Gingold@xxxxxxxx>]

Le Jeudi 09 Mars 2006 02:05, Tian, Kevin a écrit :
> From: Luck,Tony
>
> >Sent: 2006年3月9日 8:55
> >To: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
> >Subject: [Xen-ia64-devel] RE: SMP-g design notes
> >
> >> Because it is design time, here are some note about my SMP-g work.
> >> The current patch is very small.  I tried only to bring-up SMP-g ASAP to
> >
> >catch
> >
> >> more SMP bugs.  Also I tried to minimize Linux kernel changes.
> >
> >                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> ><philosophy>
> >In almost all design decisions you need to make tradeoffs ... I don't
> >think that "minimizing Linux kernel changes" should be very high up
> >the list of priorities when making a choice.  Correctness is always
> >at the top, meeting requirements, complexity, maintainability and
> >performance should be close behind.  Not disturbing the existing source
> >base too much is much further down the list (which is not to be
> >interpreted as "Tony wants to see huge patches that change everything"
> >... when they come, Tony wants to see intelligent patches that do the
> >right things in the right layer rather than a minimal patch in one
> >layer, and an ugly mess to compensate in another layer).
> ></philosophy>
> >
> >-Tony
>
> Totally agree. :-P
I also almost agree.

But *in this case*, minimizing kernel also mean correctness, reduced 
complexity and maintainability.
Performance on booting up CPUs doesn't really care.
The only question is IPI.

Tristan.


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