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From: Peter Zijlstra <peterz@infradead.org>
To: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Mel Gorman <mgorman@techsingularity.net>,
	Rik van Riel <riel@surriel.com>,
	Thomas Gleixner <tglx@linutronix.de>, Wang <wang.yi59@zte.com.cn>,
	zhong.weidong@zte.com.cn, Yi Liu <liu.yi24@zte.com.cn>,
	Frederic Weisbecker <frederic@kernel.org>
Subject: Re: [PATCH v3 2/3] sched/core: Don't mix isolcpus and housekeeping CPUs
Date: Fri, 26 Oct 2018 10:33:03 +0200	[thread overview]
Message-ID: <20181026083303.GX3109@worktop.c.hoisthospitality.com> (raw)
In-Reply-To: <1540492943-17147-3-git-send-email-srikar@linux.vnet.ibm.com>

On Fri, Oct 26, 2018 at 12:12:22AM +0530, Srikar Dronamraju wrote:
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index 3064e0f..37e62b8 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -1003,7 +1003,19 @@ static int migration_cpu_stop(void *data)
>   */
>  void set_cpus_allowed_common(struct task_struct *p, const struct cpumask *new_mask)
>  {
> -	cpumask_copy(&p->cpus_allowed, new_mask);
> +	const struct cpumask *hk_mask = housekeeping_cpumask(HK_FLAG_DOMAIN);
> +
> +	/*
> +	 * If the cpumask provided has CPUs that are part of isolated and
> +	 * housekeeping_cpumask, then restrict it to just the CPUs that
> +	 * are part of the housekeeping_cpumask.
> +	 */
> +	if (!cpumask_subset(new_mask, hk_mask) &&
> +			cpumask_intersects(new_mask, hk_mask))
> +		cpumask_and(&p->cpus_allowed, new_mask, hk_mask);
> +	else
> +		cpumask_copy(&p->cpus_allowed, new_mask);
> +
>  	p->nr_cpus_allowed = cpumask_weight(new_mask);

NAK, I already explained that.

  reply	other threads:[~2018-10-26  8:49 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-25 18:42 [PATCH v3 0/3] isolcpus Srikar Dronamraju
2018-10-25 18:42 ` [PATCH v3 1/3] sched/core: Warn if cpumask has a mix of isolcpus and housekeeping CPUs Srikar Dronamraju
2018-10-26  8:32   ` Peter Zijlstra
2018-10-25 18:42 ` [PATCH v3 2/3] sched/core: Don't mix " Srikar Dronamraju
2018-10-26  8:33   ` Peter Zijlstra [this message]
2018-10-25 18:42 ` [PATCH v3 3/3] sched/core: Error out if cpumask has a mix of " Srikar Dronamraju

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