linux-kernel - Re: [PATCH] sched: Fix numabalancing to work with isolated cpus

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Date:   Thu, 06 Apr 2017 09:36:50 +0200
From:   Mike Galbraith <efault@....de>
To:     Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH] sched: Fix numabalancing to work with isolated cpus

On Tue, 2017-04-04 at 22:57 +0530, Srikar Dronamraju wrote:

> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index f045a35..f853dc0 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -1666,6 +1666,10 @@ static void task_numa_find_cpu(struct task_numa_env *env,
>  > 	> 	> if (!cpumask_test_cpu(cpu, &env->p->cpus_allowed))
>  > 	> 	> 	> continue;
>  
> +> 	> 	> /* Skip isolated cpus */
> +> 	> 	> if (cpumask_test_cpu(cpu, cpu_isolated_map))
> +> 	> 	> 	> continue;

Methinks that should check for !cpu_rq(cpu)->sd, so the thing doesn't
screw up cpuset isolation either.

	-Mike