linux-kernel - Re: [lkp-robot] [mm, memcontrol] 309fe96bfc: vm-scalability.throughput +23.0% improvement

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Message-ID: <20180528120318.GB27180@dhcp22.suse.cz>
Date:   Mon, 28 May 2018 14:03:18 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     kernel test robot <xiaolong.ye@...el.com>
Cc:     Tejun Heo <tj@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
        lkp@...org
Subject: Re: [lkp-robot] [mm, memcontrol]  309fe96bfc:
 vm-scalability.throughput +23.0% improvement

On Mon 28-05-18 19:40:19, kernel test robot wrote:
> 
> Greeting,
> 
> FYI, we noticed a +23.0% improvement of vm-scalability.throughput due to commit:
> 
> 
> commit: 309fe96bfc0ae387f53612927a8f0dc3eb056efd ("mm, memcontrol: implement memory.swap.events")
> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master

This doesn't make any sense to me. The patch merely adds an accounting.
It doesn't optimize anything. So I strongly suspect the result is just
misleading or the test (environment) misconfigured. Not the first time
I am seeing something like that I am afraid.

-- 
Michal Hocko
SUSE Labs