Messages in this thread | | | Date | Thu, 21 May 2015 21:30:16 +0200 (CEST) | From | Thomas Gleixner <> | Subject | Re: [RFC PATCH 2/4] x86, mwaitt: introduce mwaitx idle with a configurable timer |
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On Thu, 21 May 2015, Borislav Petkov wrote:
> On Thu, May 21, 2015 at 10:56:32PM +0800, Huang Rui wrote: > > Looks like good use case. Boris, could we try to implement it? > > Andy had some suggestions on how to do it here: > > https://lkml.kernel.org/r/555D3629.8080002@kernel.org > > which should be doable. Also, you'd probably need to set ECX[0]=0b too, > so that MWAITX doesn't get woken up by interrupts while MWAIT-ing with > interrupts disabled. I.e., this sequence: > > cli > rdtsc > shove the computed timeout into ebx > mov $2,%ecx # this enables the timer and disables IRQs while MWAITing > mwaitx > sti
And the above sucks for udelay, because you disable interrupts for random amounts of time.
Thanks,
tglx
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