linux-kernel - Re: [PATCH v3 1/2] sched/topology: Don't try to build empty sched domains

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Date:   Wed, 23 Oct 2019 15:12:03 +0100
From:   Valentin Schneider <valentin.schneider@....com>
To:     Dietmar Eggemann <dietmar.eggemann@....com>,
        linux-kernel@...r.kernel.org, cgroups@...r.kernel.org
Cc:     lizefan@...wei.com, tj@...nel.org, hannes@...xchg.org,
        mingo@...nel.org, peterz@...radead.org, vincent.guittot@...aro.org,
        morten.rasmussen@....com, qperret@...gle.com,
        stable@...r.kernel.org
Subject: Re: [PATCH v3 1/2] sched/topology: Don't try to build empty sched
 domains

On 23/10/2019 12:46, Dietmar Eggemann wrote:
> Can you not just prevent that a cpuset pointer (cp) is added to the
> cpuset array (csa[]) in case cpumask_empty(cp->effective_cpus)?
> 
> @@ -798,9 +800,14 @@ static int generate_sched_domains(cpumask_var_t
> **domains, cpumask_subset(cp->cpus_allowed, top_cpuset.effective_cpus))
>                         continue;
> 
> -   if (is_sched_load_balance(cp))
> +   if (is_sched_load_balance(cp) && !cpumask_empty(cp->effective_cpus))
>             csa[csn++] = cp;
> 

I think you're right. Let me give it a shot and I'll spin a v4 with this +
better changelog for the key.

>>  		dp = doms[nslot];
>>  
>>  		if (nslot == ndoms) {
> 
> [...]
>