linux-kernel - Re: [LKP] [mm] 87eaceb3fa: stress-ng.madvise.ops_per

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Date:   Sun, 3 Nov 2019 10:28:26 +0800
From:   Feng Tang <feng.tang@...el.com>
To:     Yang Shi <yang.shi@...ux.alibaba.com>
Cc:     "Chen, Rong A" <rong.a.chen@...el.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...e.com>,
        Hugh Dickins <hughd@...gle.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        David Rientjes <rientjes@...gle.com>, Qian Cai <cai@....pw>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        LKML <linux-kernel@...r.kernel.org>, "lkp@...org" <lkp@...org>
Subject: Re: [LKP] [mm] 87eaceb3fa: stress-ng.madvise.ops_per_sec -19.6%
 regression

On Sat, Nov 02, 2019 at 01:04:36AM +0800, Yang Shi wrote:
> 
> 
> On 11/1/19 2:41 AM, Feng Tang wrote:
> > Hi Yang,
> >
> > On Mon, Sep 30, 2019 at 04:46:05PM +0800, kernel test robot wrote:
> >> Greeting,
> >>
> >> FYI, we noticed a -19.6% regression of stress-ng.madvise.ops_per_sec due to commit:
> >>
> >>
> >> commit: 87eaceb3faa59b9b4d940ec9554ce251325d83fe ("mm: thp: make deferred split shrinker memcg aware")
> >> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
> >>
> >> in testcase: stress-ng
> >> on test machine: 72 threads Intel(R) Xeon(R) Gold 6140 CPU @ 2.30GHz with 192G memory
> >> with following parameters:
> >>
> >> 	nr_threads: 100%
> >> 	disk: 1HDD
> >> 	testtime: 1s
> >> 	class: vm
> >> 	ucode: 0x200005e
> >> 	cpufreq_governor: performance
> >>
> >>
> >>
> >>
> >> If you fix the issue, kindly add following tag
> >> Reported-by: kernel test robot <rong.a.chen@...el.com>
> >>
> >>
> >> Details are as below:
> >> -------------------------------------------------------------------------------------------------->
> >>
> >>
> >> To reproduce:
> >>
> >>          git clone https://github.com/intel/lkp-tests.git
> >>          cd lkp-tests
> >>          bin/lkp install job.yaml  # job file is attached in this email
> >>          bin/lkp run     job.yaml
> >>
> >> =========================================================================================
> >> class/compiler/cpufreq_governor/disk/kconfig/nr_threads/rootfs/tbox_group/testcase/testtime/ucode:
> >>    vm/gcc-7/performance/1HDD/x86_64-rhel-7.6/100%/debian-x86_64-2019-05-14.cgz/lkp-skl-2sp8/stress-ng/1s/0x200005e
> >>
> >> commit:
> >>    0a432dcbeb ("mm: shrinker: make shrinker not depend on memcg kmem")
> >>    87eaceb3fa ("mm: thp: make deferred split shrinker memcg aware")
> >>
> >> 0a432dcbeb32edcd 87eaceb3faa59b9b4d940ec9554
> >> ---------------- ---------------------------
> >>           %stddev     %change         %stddev
> >>               \          |                \
> >>        6457           -19.5%       5198        stress-ng.madvise.ops
> >>        6409           -19.6%       5154        stress-ng.madvise.ops_per_sec
> > Do you have any clue on this?
> 
> I replied the email once I got this report, please see 
> https://lore.kernel.org/lkml/d30b1358-fb6b-2658-e675-ceff3bc465ab@linux.alibaba.com/
> 
> And, the potential fix had been posted to the mailing list, please see 
> https://lore.kernel.org/linux-mm/1569968203-64647-1-git-send-email-yang.shi@linux.alibaba.com/
> 
> But, the review looks stalled, I will try to move it forward.

Great! Thanks for the update.

- Feng

> 
> >
> > Thanks,
> > Feng
> >