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SubjectRe: [PATCH] arm64: add cpu_idle tracepoints to arch_cpu_idle
On Wed, Sep 16, 2015 at 03:23:21PM +0100, Jisheng Zhang wrote:
> Currently, if cpuidle is disabled or not supported, powertop reports
> zero wakeups and zero events. This is due to the cpu_idle tracepoints
> are missing.
>
> This patch is to make cpu_idle tracepoints always available even if
> cpuidle is disabled or not supported.
>
> Signed-off-by: Jisheng Zhang <jszhang@marvell.com>

Is there a reason why this code cannot be moved to the generic idle loop ?

Thanks,
Lorenzo

> ---
> arch/arm64/kernel/process.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
> index 223b093..f75b540 100644
> --- a/arch/arm64/kernel/process.c
> +++ b/arch/arm64/kernel/process.c
> @@ -44,6 +44,7 @@
> #include <linux/hw_breakpoint.h>
> #include <linux/personality.h>
> #include <linux/notifier.h>
> +#include <trace/events/power.h>
>
> #include <asm/compat.h>
> #include <asm/cacheflush.h>
> @@ -75,8 +76,10 @@ void arch_cpu_idle(void)
> * This should do all the clock switching and wait for interrupt
> * tricks
> */
> + trace_cpu_idle_rcuidle(1, smp_processor_id());
> cpu_do_idle();
> local_irq_enable();
> + trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id());
> }
>
> #ifdef CONFIG_HOTPLUG_CPU
> --
> 2.5.1
>
> --
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