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SubjectRe: [RFC] Extend mwait idle to optimize away IPIs when possible
On 02/06/2012 12:42 PM, Venkatesh Pallipadi wrote:
[...]
> index 5bed94e..6a56cb0 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -170,6 +170,11 @@ config GENERIC_TIME_VSYSCALL
> bool
> default X86_64
>
> +config AVOID_IPI_ON_IDLE
> + bool
> + depends on X86_64
> + default X86_64
> +

Can you get rid of this part...

> config ARCH_HAS_CPU_RELAX
> def_bool y
>
[...]
> diff --git a/arch/x86/kernel/acpi/cstate.c b/arch/x86/kernel/acpi/cstate.c
> index f50e7fb..340c4e9 100644
> --- a/arch/x86/kernel/acpi/cstate.c
> +++ b/arch/x86/kernel/acpi/cstate.c
> @@ -161,6 +161,14 @@ EXPORT_SYMBOL_GPL(acpi_processor_ffh_cstate_probe);
> */
> void mwait_idle_with_hints(unsigned long ax, unsigned long cx)
> {
> +#ifdef CONFIG_AVOID_IPI_ON_IDLE


... and change all of these to #ifdef CONFIG_64BIT

> + int oldval, cpu = smp_processor_id();
> +
.
.
.

Thanks,
David Daney


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