On Sunday, May 10, 2015 01:23:35 AM Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <[email protected]>
>
> Add suspend/resume tracepoints to tick_freeze() and tick_unfreeze()
> to catch when timekeeping is suspended and resumed during suspend-to-idle
> so as to be able to check whether or not we enter the "frozen" state
> and to measure the time spent in it.
>
> Signed-off-by: Rafael J. Wysocki <[email protected]>
Thomas, Peter, any objections here?
> ---
>
> Sorry for the duplication, but I messed up the Thomas' address in the
> previous one.
>
> ---
> kernel/time/tick-common.c | 15 +++++++++++----
> 1 file changed, 11 insertions(+), 4 deletions(-)
>
> Index: linux-pm/kernel/time/tick-common.c
> ===================================================================
> --- linux-pm.orig/kernel/time/tick-common.c
> +++ linux-pm/kernel/time/tick-common.c
> @@ -19,6 +19,7 @@
> #include <linux/profile.h>
> #include <linux/sched.h>
> #include <linux/module.h>
> +#include <trace/events/power.h>
>
> #include <asm/irq_regs.h>
>
> @@ -457,10 +458,13 @@ void tick_freeze(void)
> raw_spin_lock(&tick_freeze_lock);
>
> tick_freeze_depth++;
> - if (tick_freeze_depth == num_online_cpus())
> + if (tick_freeze_depth == num_online_cpus()) {
> + trace_suspend_resume(TPS("timekeeping_freeze"),
> + smp_processor_id(), true);
> timekeeping_suspend();
> - else
> + } else {
> tick_suspend_local();
> + }
>
> raw_spin_unlock(&tick_freeze_lock);
> }
> @@ -478,10 +482,13 @@ void tick_unfreeze(void)
> {
> raw_spin_lock(&tick_freeze_lock);
>
> - if (tick_freeze_depth == num_online_cpus())
> + if (tick_freeze_depth == num_online_cpus()) {
> timekeeping_resume();
> - else
> + trace_suspend_resume(TPS("timekeeping_freeze"),
> + smp_processor_id(), false);
> + } else {
> tick_resume_local();
> + }
>
> tick_freeze_depth--;
>
>
> --
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--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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