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Date: Fri, 19 Nov 2010 16:51:39 +0200
Message-ID: <AANLkTikdC_Hio9cM-FOz_C2h4Bg-atXxMgny7qDzSMim@mail.gmail.com>
From: Daniel Nebdal <dnebdal@gmail.com>
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Cc: freebsd-acpi@freebsd.org
Subject: Re: aperf/mperf
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On Fri, Nov 19, 2010 at 4:39 PM, Andriy Gapon <avg@freebsd.org> wrote:
>
> I am thinking about providing two APIs for this.
>
> 1. KPI
> void cpu_get_a_m_perf(u_int cpu, uint64_t *aperf, uint64_t *mperf);
>
> 2. Userland
> sysctl dev.cpu.N.aperf_mperf that returns two UQUAD values.
>
> But I am not sure where to put the code for both APIs.
> Adding another device under cpu seems like an overkill.
>
> Ideas?
> Thanks!


No comment on where to put it, but one other detail: Since these are
measures since last reset, you probably want a similar
"cpu_zero_a_m_perf" call. As for how that interacts with the sysctl,
uhm ... maybe also offering a time-since-last-reset could be useful?

--
Daniel Nebdal