Re: [PATCH v2 4/4] xen: credit2: add a few performance counters

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

On 02/27/2015 04:51 PM, Dario Faggioli wrote:
> for events that are specific to Credit2 (as it happens
> for Credit1 already).
> 
> Signed-off-by: Dario Faggioli <dario.faggioli@citrix.com>
> Cc: George Dunlap <george.dunlap@eu.citrix.com>
> Cc: Jan Beulich <JBeulich@suse.com>
> Cc: Keir Fraser <keir@xen.org>
> Acked-by: Jan Beulich <jbeulich@suse.com>
> ---
> Changes from v1:
>  * fixed the repeated typo in perfc_defn.h, as requested
>    during review.
> ---
>  xen/common/sched_credit2.c   |   23 +++++++++++++++++++++++
>  xen/include/xen/perfc_defn.h |   15 ++++++++++++++-
>  2 files changed, 37 insertions(+), 1 deletion(-)
> 
> diff --git a/xen/common/sched_credit2.c b/xen/common/sched_credit2.c
> index c0f7452..bf0d651 100644
> --- a/xen/common/sched_credit2.c
> +++ b/xen/common/sched_credit2.c
> @@ -654,6 +654,8 @@ static void reset_credit(const struct scheduler *ops, int cpu, s_time_t now,
>          }
>      }
>  
> +    SCHED_STAT_CRANK(credit_reset);
> +

Is this one actually useful?  Anyway, it's the only one I could find
that I had that question for, so not a big deal to leave it in. :-)

One more minor thing:

> diff --git a/xen/include/xen/perfc_defn.h b/xen/include/xen/perfc_defn.h
> index f754331..526002d 100644
> --- a/xen/include/xen/perfc_defn.h
> +++ b/xen/include/xen/perfc_defn.h
> @@ -28,10 +28,10 @@ PERFCOUNTER(vcpu_wake_runnable,     "sched: vcpu_wake_runnable")
>  PERFCOUNTER(vcpu_wake_not_runnable, "sched: vcpu_wake_not_runnable")
>  PERFCOUNTER(tickle_idlers_none,     "sched: tickle_idlers_none")
>  PERFCOUNTER(tickle_idlers_some,     "sched: tickle_idlers_some")
> +PERFCOUNTER(vcpu_check,             "sched: vcpu_check")
>  
>  /* credit specific counters */
>  PERFCOUNTER(delay_ms,               "csched: delay")
> -PERFCOUNTER(vcpu_check,             "csched: vcpu_check")

You forgot to mention making this one generic in your patch description.
 But that's probably not worth a re-spin either. :-)

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

 -George