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Subject: Re: [PATCH v16 00/22] per memcg lru_lock
To:     Alexander Duyck <alexander.duyck@gmail.com>
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        Mel Gorman <mgorman@techsingularity.net>,
        Tejun Heo <tj@kernel.org>, Hugh Dickins <hughd@google.com>,
        Konstantin Khlebnikov <khlebnikov@yandex-team.ru>,
        Daniel Jordan <daniel.m.jordan@oracle.com>,
        Yang Shi <yang.shi@linux.alibaba.com>,
        Matthew Wilcox <willy@infradead.org>,
        Johannes Weiner <hannes@cmpxchg.org>,
        kbuild test robot <lkp@intel.com>,
        linux-mm <linux-mm@kvack.org>,
        LKML <linux-kernel@vger.kernel.org>, cgroups@vger.kernel.org,
        Shakeel Butt <shakeelb@google.com>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>,
        Wei Yang <richard.weiyang@gmail.com>,
        "Kirill A. Shutemov" <kirill@shutemov.name>
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 <CAKgT0UcKVyTXQ=tGv_uMV+fSvoH_-cuG9zA_zhE+S8Ou11gt=w@mail.gmail.com>
From:   Alex Shi <alex.shi@linux.alibaba.com>
Message-ID: <57c619e7-da7e-198e-3de8-530bf19b9450@linux.alibaba.com>
Date:   Fri, 17 Jul 2020 13:24:28 +0800
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在 2020/7/16 下午10:11, Alexander Duyck 写道:
>> Thanks for Testing support from Intel 0day and Rong Chen, Fengguang Wu,
>> and Yun Wang. Hugh Dickins also shared his kbuild-swap case. Thanks!
> Hi Alex,
> 
> I think I am seeing a regression with this patch set when I run the
> will-it-scale/page_fault3 test. Specifically the processes result is
> dropping from 56371083 to 43127382 when I apply these patches.
> 
> I haven't had a chance to bisect and figure out what is causing it,
> and wanted to let you know in case you are aware of anything specific
> that may be causing this.


Thanks a lot for the info!

Actually, the patch 17th, and patch 13th may changed performance a little,
like the 17th, intel LKP found vm-scalability.throughput 68.0% improvement,
and stress-ng.remap.ops_per_sec -76.3% regression, or stress-ng.memfd.ops_per_sec
 +23.2%. etc.

This kind performance interference is known and acceptable.
Thanks
Alex