Messages in this thread | | | Date | Fri, 26 Feb 2016 10:14:46 +0100 | From | Peter Zijlstra <> | Subject | Re: [RFCv7 PATCH 01/10] sched: Compute cpu capacity available at current frequency |
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On Fri, Feb 26, 2016 at 02:37:19AM +0100, Rafael J. Wysocki wrote:
> That's all correct, but my question should rather be: is arch the right > granularity? > > In theory, there may be ARM64-based platforms using ACPI and behaving > like x86 in that respect in the future.
Ah, so I started these hooks way before the cpufreq/cpuidle etc. integration push.
Maybe we should look at something like that, but performance is really critical, you most definitely do not want 3 indirections just because abstract framework crap, that's measurable overhead on these callsites.
Hence the current inline with constant value or single function call. And if archs would want a selector, I would recommend boot time call instruction rewrites a-la alternatives/paravirt.
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