linux-kernel - Re: [PATCH 3/4] mm, page_alloc: Drain per-cpu pages from workqueue context

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Date:   Tue, 24 Jan 2017 21:02:20 -0500
From:   Tejun Heo <tj@...nel.org>
To:     Mel Gorman <mgorman@...hsingularity.net>
Cc:     Vlastimil Babka <vbabka@...e.cz>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        Hillf Danton <hillf.zj@...baba-inc.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Petr Mladek <pmladek@...e.cz>
Subject: Re: [PATCH 3/4] mm, page_alloc: Drain per-cpu pages from workqueue
 context

Hello,

On Tue, Jan 24, 2017 at 11:54:57PM +0000, Mel Gorman wrote:
> @@ -2402,24 +2415,16 @@ void drain_all_pages(struct zone *zone)
>  			cpumask_clear_cpu(cpu, &cpus_with_pcps);
>  	}
>  
> +	for_each_cpu(cpu, &cpus_with_pcps) {
> +		struct work_struct *work = per_cpu_ptr(&pcpu_drain, cpu);
> +		INIT_WORK(work, drain_local_pages_wq);
> +		schedule_work_on(cpu, work);
>  	}
> +	for_each_cpu(cpu, &cpus_with_pcps)
> +		flush_work(per_cpu_ptr(&pcpu_drain, cpu));
> +
>  	put_online_cpus();
> +	mutex_unlock(&pcpu_drain_mutex);

Looks good to me.

Thanks.

-- 
tejun