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Date:	Thu, 23 Feb 2012 08:50:27 +0100
From:	Ingo Molnar <>
To:	Venkatesh Pallipadi <>
Cc:	Peter Zijlstra <>,
	Thomas Gleixner <>,
	Ingo Molnar <>,
	"H. Peter Anvin" <>,
	Suresh Siddha <>,
	Aaron Durbin <>,
	Paul Turner <>,
	Yong Zhang <>,
Subject: Re: [PATCH] Extend mwait idle to optimize away CAL and RES
 interrupts to an idle CPU -v1

* Venkatesh Pallipadi <> wrote:

> * Do we need some accounting for these wakeups exported for powertop?

If then tracepoints.

> * We can also eliminate TS_POLLING flag in favor of this. But, that will have
>   a lot more touchpoints and better done as a standlone change.

Should most definitely be done for this series to be acceptble - 
as a preparatory patch in the series, with the feature at the 
end of the series.

> +DECLARE_PER_CPU(atomic_t *, idle_task_ti_flags);

That's ugly, we should access the idle task's ti flags directly.

To have efficient percpu access to the idle threads another 
clean-up is needed: we should turn idle_thread_array into a 
full-structure PER_CPU area.

For that we need a small variant of fork_idle(), which does not 
dup the init thread - pretty trivial.

fork_idle() should also make sure it does not schedule the child 
thread: thus we'd also be able to further simplify smpboot.c and 
get rid of all that extremely ugly 'struct create_idle' 
gymnastics in smpboot.c.


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