linux-kernel - Re: [Patch v3 1/6] sched/fair: Determine active load balance for SMT sched groups

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Date:   Sat, 15 Jul 2023 11:25:58 -0700
From:   Tim Chen <tim.c.chen@...ux.intel.com>
To:     Shrikanth Hegde <sshegde@...ux.vnet.ibm.com>
Cc:     Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Ricardo Neri <ricardo.neri@...el.com>,
        "Ravi V . Shankar" <ravi.v.shankar@...el.com>,
        Ben Segall <bsegall@...gle.com>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Len Brown <len.brown@...el.com>, Mel Gorman <mgorman@...e.de>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Valentin Schneider <vschneid@...hat.com>,
        Ionela Voinescu <ionela.voinescu@....com>, x86@...nel.org,
        linux-kernel@...r.kernel.org,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        naveen.n.rao@...ux.vnet.ibm.com,
        Yicong Yang <yangyicong@...ilicon.com>,
        Barry Song <v-songbaohua@...o.com>,
        Chen Yu <yu.c.chen@...el.com>, Hillf Danton <hdanton@...a.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [Patch v3 1/6] sched/fair: Determine active load balance for
 SMT sched groups


> 
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index 294a662c9410..3fc8d3a3bd22 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -9588,6 +9588,17 @@ static bool update_sd_pick_busiest(struct lb_env *env,
>                 break;
>  
>         case group_smt_balance:
> +               /* no idle cpus on both groups handled by group_fully_busy below */
> +               if (sgs->idle_cpus != 0 || busiest->idle_cpus != 0) {
> +                       if (sgs->idle_cpus > busiest->idle_cpus)
> +                               return false;
> +                       if (sgs->idle_cpus < busiest->idle_cpus)
> +                               return true;
> +                       if (sgs->sum_nr_running <= busiest_sum_nr_running)

typo: should be busiest->sum->nr_running

> +                               return false;
> +                       else
> +                               return true;
> +               }
> 

Tim