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Message-ID: <544A5504.2090706@linaro.org> Date: Fri, 24 Oct 2014 15:32:52 +0200 From: Daniel Lezcano <daniel.lezcano@...aro.org> To: Peter Zijlstra <peterz@...radead.org> CC: rjw@...ysocki.net, nicolas.pitre@...aro.org, linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org, linaro-kernel@...ts.linaro.org Subject: Re: [PATCH 3/5] cpuidle: idle: menu: Don't reflect when a state selection failed On 10/24/2014 03:24 PM, Peter Zijlstra wrote: > On Mon, Oct 20, 2014 at 06:25:41PM +0200, Daniel Lezcano wrote: >> - if (index > 0) >> - if (index >= 0) > > That's not the same condition. Yes and it is wrong. That is the result of the CPUIDLE_DRIVER_STATE_START dance. The ladder governor is avoiding to use the POLL state as it was running on x86. But on, eg. ARM, we will never reflect the state 0 because CPUIDLE_DRIVER_STATE_START is equal to zero for all non-x86 platform. If I am not wrong the ladder select function will never choose the state 0 for x86, so it will never reflect the state 0 (after applying the patch 1/5). For the other arch it will reflect the state 0 as it should. -- <http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs Follow Linaro: <http://www.facebook.com/pages/Linaro> Facebook | <http://twitter.com/#!/linaroorg> Twitter | <http://www.linaro.org/linaro-blog/> Blog -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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