Re: [PATCH v2 3/4] x86, mwaitt: introduce mwaix delay with a configurable timer

[Peter Zijlstra]

On Tue, Jun 09, 2015 at 11:13:40AM +0800, Huang Rui wrote:
> MWAITX can enable a timer and a corresponding timer value specified in SW
> P0 clocks. The SW P0 frequency is the same with TSC. The timer provides an
> upper bound on how long the instruction waits before exiting.
> 
> The implementation of delay function in kernel can lerverage the timer of
> MWAITX. This patch provides a new method (delay_mwaitx) to measure delay
> time.

But does this actually default to mwaitx delay on capable hardware? If
you need to boot with that parameter it means nobody is ever going to
use this.
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