Date: Tue, 02 Oct 2012 10:18:33 -0700 From: Sean Bruno <seanbru@yahoo-inc.com> To: Andriy Gapon <avg@freebsd.org> Cc: "freebsd-acpi@freebsd.org" <freebsd-acpi@freebsd.org> Subject: Re: notify userland about C-state changes Message-ID: <1349198313.4246.3.camel@powernoodle.corp.yahoo.com> In-Reply-To: <504EDBEB.6010104@FreeBSD.org> References: <504EDBEB.6010104@FreeBSD.org>
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> The following patch adds only per-CPU notifications.
>
> acpi_cpu: explicitly notify userland about c-state changes
>
> diff --git a/sys/dev/acpica/acpi_cpu.c b/sys/dev/acpica/acpi_cpu.c
> index 82e204a..15201f9 100644
> --- a/sys/dev/acpica/acpi_cpu.c
> +++ b/sys/dev/acpica/acpi_cpu.c
> @@ -1054,6 +1054,8 @@ acpi_cpu_notify(ACPI_HANDLE h, UINT32 notify, void *context)
> ACPI_SERIAL_BEGIN(cpu);
> acpi_cpu_set_cx_lowest(sc);
> ACPI_SERIAL_END(cpu);
> +
> + acpi_UserNotify("PROCESSOR", sc->cpu_handle, notify);
> }
>
> static int
>
So quick question, does this happen a lot on a system with a sporadic
workload? Does this introduce overhead to the system to service the
notification requests?
Sean
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