linux-kernel - Re: [PATCH] mm, vmstat: make quiet_vmstat lighter (was: Re: fast path cycle muncher (vmstat: make vmstat_updater deferrable) again and shut down on idle)

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Message-ID: <alpine.DEB.2.20.1601281040430.5481@east.gentwo.org>
Date:	Thu, 28 Jan 2016 10:42:23 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Michal Hocko <mhocko@...nel.org>
cc:	Mike Galbraith <umgwanakikbuti@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm, vmstat: make quiet_vmstat lighter (was: Re: fast
 path cycle muncher (vmstat: make vmstat_updater deferrable) again and shut
 down on idle)

On Thu, 28 Jan 2016, Michal Hocko wrote:

> Thinking about it some more, making vmstat_update deferrable should help
> to not interrupt idle no?

It will align with the tick then. Yes indeed this should be done.
> ---
> diff --git a/mm/vmstat.c b/mm/vmstat.c
> index eb30bf45bd55..69537d2be6f6 100644
> --- a/mm/vmstat.c
> +++ b/mm/vmstat.c
> @@ -1512,7 +1512,7 @@ static void __init start_shepherd_timer(void)
>  	int cpu;
>
>  	for_each_possible_cpu(cpu)
> -		INIT_DELAYED_WORK(per_cpu_ptr(&vmstat_work, cpu),
> +		INIT_DEFERRABLE_WORK(per_cpu_ptr(&vmstat_work, cpu),
>  			vmstat_update);
>
>  	if (!alloc_cpumask_var(&cpu_stat_off, GFP_KERNEL))
>