> 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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