Re: [PATCH] perfc: count number of explicit vcpu yields

[George Dunlap <george.dunlap@citrix.com>]

On 09/11/15 14:00, Ian Campbell wrote:
> Signed-off-by: Ian Campbell <ian.campbell@citrix.com>

Reviewed-by: George Dunlap <george.dunlap@citrix.com>

> ---
>  xen/common/schedule.c        | 1 +
>  xen/include/xen/perfc_defn.h | 1 +
>  2 files changed, 2 insertions(+)
> 
> diff --git a/xen/common/schedule.c b/xen/common/schedule.c
> index 292e9a0..86d6cc0 100644
> --- a/xen/common/schedule.c
> +++ b/xen/common/schedule.c
> @@ -896,6 +896,7 @@ long vcpu_yield(void)
>      struct vcpu * v=current;
>      spinlock_t *lock = vcpu_schedule_lock_irq(v);
>  
> +    SCHED_STAT_CRANK(sched_yield);
>      SCHED_OP(VCPU2OP(v), yield, v);
>      vcpu_schedule_unlock_irq(lock, v);
>  
> diff --git a/xen/include/xen/perfc_defn.h b/xen/include/xen/perfc_defn.h
> index 76ee803..034c7d3 100644
> --- a/xen/include/xen/perfc_defn.h
> +++ b/xen/include/xen/perfc_defn.h
> @@ -16,6 +16,7 @@ PERFCOUNTER(ipis,                   "#IPIs")
>  PERFCOUNTER(sched_irq,              "sched: timer")
>  PERFCOUNTER(sched_run,              "sched: runs through scheduler")
>  PERFCOUNTER(sched_ctx,              "sched: context switches")
> +PERFCOUNTER(sched_yield,            "sched: vcpu yield")
>  PERFCOUNTER(schedule,               "sched: specific scheduler")
>  PERFCOUNTER(dom_init,               "sched: dom_init")
>  PERFCOUNTER(dom_destroy,            "sched: dom_destroy")
>