linux-kernel - Re: [PATCH 3/2] mm, vmstat: cancel pending work of the cpu_stat

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Date:	Tue, 2 Feb 2016 09:18:29 +0100
From:	Michal Hocko <mhocko@...nel.org>
To:	Mike Galbraith <mgalbraith@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Cristopher Lameter <clameter@....com>,
	Mike Galbraith <mgalbraith@...e.com>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/2] mm, vmstat: cancel pending work of the cpu_stat_off
 CPU

On Tue 02-02-16 08:53:25, Mike Galbraith wrote:
> Cancel pending work of the cpu_stat_off CPU.

Thanks for catching that Mike. This was a last minute change and I
screwed it...

Andrew could you fold this into the original patch, please?

Thanks!

> Signed-off-by: Mike Galbraith <mgalbraith@...e.de>

Acked-by: Michal Hocko <mhocko@...e.com>

> ---
>  mm/vmstat.c |   12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> --- a/mm/vmstat.c
> +++ b/mm/vmstat.c
> @@ -1486,25 +1486,25 @@ static void vmstat_shepherd(struct work_
>  
>  	get_online_cpus();
>  	/* Check processors whose vmstat worker threads have been disabled */
> -	for_each_cpu(cpu, cpu_stat_off)
> +	for_each_cpu(cpu, cpu_stat_off) {
> +		struct delayed_work *dw = &per_cpu(vmstat_work, cpu);
> +
>  		if (need_update(cpu)) {
>  			if (cpumask_test_and_clear_cpu(cpu, cpu_stat_off))
> -				queue_delayed_work_on(cpu, vmstat_wq,
> -					&per_cpu(vmstat_work, cpu), 0);
> +				queue_delayed_work_on(cpu, vmstat_wq, dw, 0);
>  		} else {
>  			/*
>  			 * Cancel the work if quiet_vmstat has put this
>  			 * cpu on cpu_stat_off because the work item might
>  			 * be still scheduled
>  			 */
> -			cancel_delayed_work(this_cpu_ptr(&vmstat_work));
> +			cancel_delayed_work(dw);
>  		}
> -
> +	}
>  	put_online_cpus();
>  
>  	schedule_delayed_work(&shepherd,
>  		round_jiffies_relative(sysctl_stat_interval));
> -
>  }
>  
>  static void __init start_shepherd_timer(void)

-- 
Michal Hocko
SUSE Labs