lkml.org 
[lkml]   [2012]   [Feb]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH] Extend mwait idle to optimize away CAL and RES interrupts to an idle CPU -v1
From
[ Resending without the ugly email client formatting ]

On Wed, Feb 22, 2012 at 11:50 PM, Ingo Molnar <mingo@elte.hu> wrote:
>
> * Venkatesh Pallipadi <venki@google.com> 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,
Venki

> Thanks,
>
>        Ingo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2012-02-23 21:05    [W:0.167 / U:0.484 seconds]
©2003-2014 Jasper Spaans. Advertise on this site