Re: [PATCH v2 01/16] xen: sched: __runq_tickle takes a useless cpu parameter

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

On 16/02/16 18:11, Dario Faggioli wrote:
> as it is always acts on v->processor of the vcpu that
> we are tickling.
> 
> Getting rid of it makes the code easier to understand
> and better looking.
> 
> While there, remove a spurious blank line.
> 
> Signed-off-by: Dario Faggioli <dario.faggioli@citrix.com>
> Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

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

> ---
> Cc: George Dunlap <george.dunlap@citrix.com>
> ---
> Changes from v1:
>  * fix wording inside the changelog, as suggested during
>    review.
> ---
>  xen/common/sched_credit.c |   10 ++++------
>  1 file changed, 4 insertions(+), 6 deletions(-)
> 
> diff --git a/xen/common/sched_credit.c b/xen/common/sched_credit.c
> index 671bbee..5279b92 100644
> --- a/xen/common/sched_credit.c
> +++ b/xen/common/sched_credit.c
> @@ -360,9 +360,9 @@ boolean_param("tickle_one_idle_cpu", opt_tickle_one_idle);
>  
>  DEFINE_PER_CPU(unsigned int, last_tickle_cpu);
>  
> -static inline void
> -__runq_tickle(unsigned int cpu, struct csched_vcpu *new)
> +static inline void __runq_tickle(struct csched_vcpu *new)
>  {
> +    unsigned int cpu = new->vcpu->processor;
>      struct csched_vcpu * const cur = CSCHED_VCPU(curr_on_cpu(cpu));
>      struct csched_private *prv = CSCHED_PRIV(per_cpu(scheduler, cpu));
>      cpumask_t mask, idle_mask, *online;
> @@ -375,7 +375,6 @@ __runq_tickle(unsigned int cpu, struct csched_vcpu *new)
>      cpumask_and(&idle_mask, prv->idlers, online);
>      idlers_empty = cpumask_empty(&idle_mask);
>  
> -
>      /*
>       * If the pcpu is idle, or there are no idlers and the new
>       * vcpu is a higher priority than the old vcpu, run it here.
> @@ -980,11 +979,10 @@ static void
>  csched_vcpu_wake(const struct scheduler *ops, struct vcpu *vc)
>  {
>      struct csched_vcpu * const svc = CSCHED_VCPU(vc);
> -    const unsigned int cpu = vc->processor;
>  
>      BUG_ON( is_idle_vcpu(vc) );
>  
> -    if ( unlikely(curr_on_cpu(cpu) == vc) )
> +    if ( unlikely(curr_on_cpu(vc->processor) == vc) )
>      {
>          SCHED_STAT_CRANK(vcpu_wake_running);
>          return;
> @@ -1028,7 +1026,7 @@ csched_vcpu_wake(const struct scheduler *ops, struct vcpu *vc)
>  
>      /* Put the VCPU on the runq and tickle CPUs */
>      __runq_insert(svc);
> -    __runq_tickle(cpu, svc);
> +    __runq_tickle(svc);
>  }
>  
>  static void
>