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Date:   Mon, 2 Nov 2020 10:27:54 +0100
From:   Michal Hocko <mhocko@suse.com>
To:     kernel test robot <rong.a.chen@intel.com>
Cc:     Waiman Long <longman@redhat.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Shakeel Butt <shakeelb@google.com>,
        Chris Down <chris@chrisdown.name>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Roman Gushchin <guro@fb.com>, Tejun Heo <tj@kernel.org>,
        Vladimir Davydov <vdavydov.dev@gmail.com>,
        Yafang Shao <laoar.shao@gmail.com>,
        LKML <linux-kernel@vger.kernel.org>, lkp@lists.01.org,
        lkp@intel.com, ying.huang@intel.com, feng.tang@intel.com,
        zhengjun.xing@intel.com
Subject: Re: [mm/memcg] bd0b230fe1: will-it-scale.per_process_ops -22.7%
 regression
Message-ID: <20201102092754.GD22613@dhcp22.suse.cz>
References: <20201102091543.GM31092@shao2-debian>
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On Mon 02-11-20 17:15:43, kernel test robot wrote:
> Greeting,
> 
> FYI, we noticed a -22.7% regression of will-it-scale.per_process_ops due to commit:
> 
> 
> commit: bd0b230fe14554bfffbae54e19038716f96f5a41 ("mm/memcg: unify swap and memsw page counters")
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master

I really fail to see how this can be anything else than a data structure
layout change. There is one counter less. 

btw. are cgroups configured at all? What would be the configuration?
-- 
Michal Hocko
SUSE Labs