linux-kernel - Re: [PATCH 11/14] sched: filter task pull request

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Message-ID: <CAKfTPtCUvKmTHzyVRCkGyM-nWOSWP8OUzMgyCyzPEXf1NoxsQQ@mail.gmail.com>
Date:	Fri, 26 Apr 2013 12:00:58 +0200
From:	Vincent Guittot <vincent.guittot@...aro.org>
To:	linux-kernel <linux-kernel@...r.kernel.org>,
	LAK <linux-arm-kernel@...ts.infradead.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Paul Turner <pjt@...gle.com>,
	Santosh <santosh.shilimkar@...com>,
	Morten Rasmussen <Morten.Rasmussen@....com>,
	Chander Kashyap <chander.kashyap@...aro.org>,
	"cmetcalf@...era.com" <cmetcalf@...era.com>,
	"tony.luck@...el.com" <tony.luck@...el.com>,
	Alex Shi <alex.shi@...el.com>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>
Cc:	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Len Brown <len.brown@...el.com>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Amit Kucheria <amit.kucheria@...aro.org>,
	Jonathan Corbet <corbet@....net>,
	Lukasz Majewski <l.majewski@...sung.com>,
	Vincent Guittot <vincent.guittot@...aro.org>
Subject: Re: [PATCH 11/14] sched: filter task pull request

Part of this patch is missing, the fix below is needed

@@ -3497,7 +3497,9 @@ static bool is_buddy_full(int cpu)
 static bool is_my_buddy(int cpu, int buddy)
 {
  int my_buddy = per_cpu(sd_pack_buddy, cpu);
- return (my_buddy == -1) || (buddy == my_buddy);
+
+ return ((sysctl_sched_packing_mode == SCHED_PACKING_FULL) &&
+               ((my_buddy == -1) || (buddy == my_buddy)));
 }

 static bool is_light_task(struct task_struct *p)


On 25 April 2013 19:23, Vincent Guittot <vincent.guittot@...aro.org> wrote:
> Only CPUs that participates to the packing effort can pull tasks on a busiest
> group.
>
> Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
> ---
>  kernel/sched/fair.c |   14 ++++++++++++--
>  1 file changed, 12 insertions(+), 2 deletions(-)
>
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index 28f8ea7..6f63fb9 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -3494,6 +3494,12 @@ static bool is_buddy_full(int cpu)
>         return (sum * 1024 >= period * 1000);
>  }
>
> +static bool is_my_buddy(int cpu, int buddy)
> +{
> +       int my_buddy = per_cpu(sd_pack_buddy, cpu);
> +       return (my_buddy == -1) || (buddy == my_buddy);
> +}
> +
>  static bool is_light_task(struct task_struct *p)
>  {
>         /* A light task runs less than 20% in average */
> @@ -4688,8 +4694,8 @@ static inline void update_sg_lb_stats(struct lb_env *env,
>
>                 /* Bias balancing toward cpus of our domain */
>                 if (local_group) {
> -                       if (idle_cpu(i) && !first_idle_cpu &&
> -                                       cpumask_test_cpu(i, sched_group_mask(group))) {
> +                       if (is_my_buddy(i, i) && idle_cpu(i) && !first_idle_cpu
> +                        && cpumask_test_cpu(i, sched_group_mask(group))) {
>                                 first_idle_cpu = 1;
>                                 balance_cpu = i;
>                         }
> @@ -4817,6 +4823,10 @@ static void update_plb_buddy(int cpu, int *balance, struct sd_lb_stats *sds,
>
>         /* Get my new buddy */
>         buddy = per_cpu(sd_pack_buddy, cpu);
> +
> +       /* This CPU doesn't act for agressive packing */
> +       if (buddy != cpu)
> +               sds->busiest = 0;
>  }
>
>  /**
> --
> 1.7.9.5
>
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