Re: [PATCH] Extend mwait idle to optimize away CAL and RES interruptsto an idle CPU -v1

[Venki Pallipadi]

[ Resending without the ugly email client formatting ]

On Thu, Feb 23, 2012 at 1:08 AM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> On Thu, 2012-02-23 at 08:50 +0100, Ingo Molnar wrote:
>> * Venkatesh Pallipadi <venki@xxxxxxxxxx> wrote:
>
>> > * 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.
>
> I don't think you can, TS_POLLING still works for idle=poll, whereas
> this new stuff requires monitor/mwait.
>

Even poll_idle should be able to use this ipiless_wakeup. It just have
to poll for an additional IPI_PENDING bit along with need_resched.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/