Messages in this thread | | | Date | Tue, 9 Jun 2015 18:10:31 +0800 | From | Huang Rui <> | Subject | Re: [PATCH v2 3/4] x86, mwaitt: introduce mwaix delay with a configurable timer |
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On Tue, Jun 09, 2015 at 04:31:03PM +0800, Peter Zijlstra wrote: > 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.
Oh, I see. Actually, you're right. Maybe nobody except us will use it. Will update in V3.
Thanks, Rui
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