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

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Date:   Wed, 25 Jan 2017 08:30:58 +0000
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Tejun Heo <tj@...nel.org>
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

On Tue, Jan 24, 2017 at 09:02:20PM -0500, Tejun Heo wrote:
> 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.

-- 
Mel Gorman
SUSE Labs