linux-kernel - Re: [patch 2/2] MM: allow per-cpu vmstat_threshold and vmstat

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Date:   Mon, 22 May 2017 11:35:55 -0500 (CDT)
From:   Christoph Lameter <cl@...ux.com>
To:     Luiz Capitulino <lcapitulino@...hat.com>
cc:     Marcelo Tosatti <mtosatti@...hat.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Rik van Riel <riel@...hat.com>,
        Linux RT Users <linux-rt-users@...r.kernel.org>,
        cmetcalf@...lanox.com
Subject: Re: [patch 2/2] MM: allow per-cpu vmstat_threshold and vmstat_worker
 configuration

On Fri, 19 May 2017, Luiz Capitulino wrote:

> Something that crossed my mind was to add a new tunable to set
> the vmstat_interval for each CPU, this way we could essentially
> disable it to the CPUs where DPDK is running. What's the implications
> of doing this besides not getting up to date stats in /proc/vmstat
> (which I still have to confirm would be OK)? Can this break anything
> in the kernel for example?

The data is still going to be updated when the differential gets to big.

Increasing the vmstat interval and reducing the differential threshold
would get your there....