Re: [PATCH] 2.6.1 Hyperthread smart "nice" 2

[Andrew Morton <akpm _at_ xxxxxxxx>]

Ingo Molnar <mingo _at_ elte.hu> wrote:
>
> * Con Kolivas <kernel _at_ kolivas.org> wrote:
> 
> > At least it appears Intel are well aware of the priority problem, but
> > full priority support across logical cores is not likely. However I
> > guess these new instructions are probably enough to work with if
> > someone can do the coding.
> 
> these instructions can be used in the idle=poll code instead of rep-nop. 
> This way idle-wakeup can be done via the memory bus in essence, and the
> idle threads wont waste CPU time. (right now idle=poll wastes lots of
> cycles on HT boxes and is thus unusable.)

The code to do this was merged quite a while ago.  See
arch/i386/kernel/process.c:mwait_idle().

I was hoping to see a spinlock patch using mwait(), but nothing yet..
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