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Date:	Thu, 23 Feb 2012 12:03:48 -0800
From:	Venki Pallipadi <>
To:	Ingo Molnar <>
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

[ Resending without the ugly email client formatting ]

On Wed, Feb 22, 2012 at 11:50 PM, Ingo Molnar <> wrote:
> * 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.
OK. Will look at TS_POLLING part and likely include it in the next resend.

>> +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.

Hmm. Not being very familiar with that code, I will have to take a closer
look at this potential cleanup...


> Thanks,
>        Ingo
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