linux-kernel - Re: [PATCH v5 5/5] cpuset: Rebuild root domain deadline accounting information

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Date:   Tue, 25 Sep 2018 14:53:59 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Juri Lelli <juri.lelli@...hat.com>
Cc:     mingo@...hat.com, rostedt@...dmis.org,
        linux-kernel@...r.kernel.org, luca.abeni@...tannapisa.it,
        claudio@...dence.eu.com, tommaso.cucinotta@...tannapisa.it,
        bristot@...hat.com, mathieu.poirier@...aro.org, lizefan@...wei.com,
        cgroups@...r.kernel.org
Subject: Re: [PATCH v5 5/5] cpuset: Rebuild root domain deadline accounting
 information

On Mon, Sep 03, 2018 at 04:28:01PM +0200, Juri Lelli wrote:
> diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
> index fb7ae691cb82..08128bdf3944 100644
> --- a/kernel/sched/topology.c
> +++ b/kernel/sched/topology.c
> @@ -1883,8 +1883,19 @@ void partition_sched_domains_locked(int ndoms_new, cpumask_var_t doms_new[],
>  	for (i = 0; i < ndoms_cur; i++) {
>  		for (j = 0; j < n && !new_topology; j++) {
>  			if (cpumask_equal(doms_cur[i], doms_new[j])
> -			    && dattrs_equal(dattr_cur, i, dattr_new, j))
> +			    && dattrs_equal(dattr_cur, i, dattr_new, j)) {

While there, please also fix that wrongly placed operator.

> +				struct root_domain *rd;
> +
> +				/*
> +				 * This domain won't be destroyed and as such
> +				 * its dl_bw->total_bw needs to be cleared.  It
> +				 * will be recomputed in function
> +				 * update_tasks_root_domain().
> +				 */
> +				rd = cpu_rq(cpumask_any(doms_cur[i]))->rd;
> +				dl_clear_root_domain(rd);
>  				goto match1;
> +			}
>  		}
>  		/* No match - a current sched domain not in new doms_new[] */
>  		detach_destroy_domains(doms_cur[i]);
> -- 
> 2.17.1
>