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From: Rong Chen <rong.a.chen@intel.com>
To: Alex Shi <alex.shi@linux.alibaba.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	cgroups@vger.kernel.org, mgorman@techsingularity.net,
	tj@kernel.org, hughd@google.com, khlebnikov@yandex-team.ru,
	daniel.m.jordan@oracle.com, yang.shi@linux.alibaba.com,
	willy@infradead.org, hannes@cmpxchg.org, lkp@intel.com,
	Michal Hocko <mhocko@kernel.org>,
	Vladimir Davydov <vdavydov.dev@gmail.com>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH v9 07/20] mm/lru: introduce TestClearPageLRU
Date: Wed, 4 Mar 2020 17:03:01 +0800	[thread overview]
Message-ID: <20200304090301.GB5972@shao2-debian> (raw)
In-Reply-To: <6d155f79-8ba2-b322-4e92-311e7be98f79@linux.alibaba.com>

On Wed, Mar 04, 2020 at 03:06:48PM +0800, Alex Shi wrote:
> 
> 
> 在 2020/3/4 上午8:46, Andrew Morton 写道:
> > 
> > Well, any difference would be small and the numbers did get a bit
> > lower, albeit probably within the margin of error.
> > 
> > But you know, if someone were to send a patch which micro-optimized
> > some code by replacing 'TestClearXXX()' with `if PageXXX()
> > ClearPageXXX()', I would happily merge it!
> > 
> > Is this change essential to the overall patchset?  If not, I'd be
> > inclined to skip it?
> > 
> 
> Hi Andrew,
> 
> Thanks a lot for comments!
> Yes, this patch is essential for all next.
> 
> Consider the normal memory testing would focus on user page, that probabably with PageLRU. 
> 
> Fengguang's vm-scalibicase-small-allocs which used a lots vm_area_struct slab, which may
> got some impact. 0day/Cheng Rong is working on the test. In my roughly testing, it may drop 5% on my
> 96threads/394GB machine.
> 
> Thanks
> Alex

Hi,

We only tested one case and found a slight regression of vm-scalability.median from this patch set:

Test case: small allocs
=========================================================================================
compiler/cpufreq_governor/kconfig/rootfs/runtime/tbox_group/test/testcase/ucode:
  gcc-7/performance/x86_64-rhel-7.6/debian-x86_64-20191114.cgz/300s/lkp-ivb-d02/small-allocs/vm-scalability/0x21

commit: 
  v5.6-rc4
  f71ed0f653e9dbd57347f6321e36556004a17b52

        v5.6-rc4 f71ed0f653e9dbd57347f6321e3 
---------------- --------------------------- 
         %stddev     %change         %stddev
             \          |                \  
    998930            -1.4%     984729        vm-scalability.median

=========================================================================================
compiler/cpufreq_governor/kconfig/rootfs/runtime/tbox_group/test/testcase/ucode:
  gcc-7/performance/x86_64-rhel-7.6/debian-x86_64-20191114.cgz/300s/lkp-csl-2ap4/small-allocs/vm-scalability/0x500002c

commit: 
  v5.6-rc4
  f71ed0f653e9dbd57347f6321e36556004a17b52

        v5.6-rc4 f71ed0f653e9dbd57347f6321e3 
---------------- --------------------------- 
         %stddev     %change         %stddev
             \          |                \  
     64040            -2.2%      62641        vm-scalability.median
  12294118            -2.2%   12027483        vm-scalability.throughput
 3.695e+09            -2.2%  3.614e+09        vm-scalability.workload


$ git log --oneline v5.6-rc4..f71ed0f653e9dbd57347f6321e36556004a17b52
f71ed0f653e9d mm/memcg: add debug checking in lock_page_memcg
c56d782a737a5 mm/lru: add debug checking for page memcg moving
40f9438e4f7a9 mm/lru: revise the comments of lru_lock
cf4d433ab1f59 mm/pgdat: remove pgdat lru_lock
8b45216bf602c mm/swap: only change the lru_lock iff page's lruvec is different
9aeff27f856c4 mm/mlock: optimize munlock_pagevec by relocking
0fd16f50f4260 mm/lru: introduce the relock_page_lruvec function
e8bcc2440b133 mm/lru: replace pgdat lru_lock with lruvec lock
88013de2d9cfa mm/mlock: clean up __munlock_isolate_lru_page
037f0e01cc3a3 mm/memcg: move SetPageLRU out of lru_lock in commit_charge
5f889edacd91d mm/lru: take PageLRU first in moving page between lru lists
06998f054a82b mm/mlock: ClearPageLRU before get lru lock in munlock page isolation
5212e3636eed6 mm/lru: add page isolation precondition in __isolate_lru_page
a7b8b29f36b13 mm/lru: introduce TestClearPageLRU
f27e8da1e2fa1 mm/thp: narrow lru locking
2deca0177d843 mm/thp: clean up lru_add_page_tail
afbe030c47e06 mm/thp: move lru_add_page_tail func to huge_memory.c
9bee24913b538 mm/page_idle: no unlikely double check for idle page counting
40def76b96d7b mm/memcg: fold lock_page_lru into commit_charge
c1199696673c2 mm/vmscan: remove unnecessary lruvec adding

Best Regards,
Rong Chen

  reply	other threads:[~2020-03-04  9:03 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1583146830-169516-1-git-send-email-alex.shi@linux.alibaba.com>
2020-03-02 11:00 ` [PATCH v9 01/20] mm/vmscan: remove unnecessary lruvec adding Alex Shi
2020-03-02 11:00 ` [PATCH v9 02/20] mm/memcg: fold lock_page_lru into commit_charge Alex Shi
2020-03-02 11:00 ` [PATCH v9 03/20] mm/page_idle: no unlikely double check for idle page counting Alex Shi
2020-03-02 11:00 ` [PATCH v9 04/20] mm/thp: move lru_add_page_tail func to huge_memory.c Alex Shi
2020-03-04  7:47   ` Kirill A. Shutemov
2020-03-04  8:13     ` Alex Shi
2020-03-02 11:00 ` [PATCH v9 05/20] mm/thp: clean up lru_add_page_tail Alex Shi
2020-03-02 11:00 ` [PATCH v9 06/20] mm/thp: narrow lru locking Alex Shi
2020-03-04  8:02   ` Kirill A. Shutemov
2020-03-04  8:51     ` Alex Shi
2020-03-02 11:00 ` [PATCH v9 07/20] mm/lru: introduce TestClearPageLRU Alex Shi
2020-03-02 22:11   ` Andrew Morton
2020-03-03  4:11     ` Alex Shi
2020-03-04  0:46       ` Andrew Morton
2020-03-04  7:06         ` Alex Shi
2020-03-04  9:03           ` Rong Chen [this message]
2020-03-04  9:37             ` Alex Shi
2020-03-02 11:00 ` [PATCH v9 08/20] mm/lru: add page isolation precondition in __isolate_lru_page Alex Shi
2020-03-02 11:00 ` [PATCH v9 09/20] mm/mlock: ClearPageLRU before get lru lock in munlock page isolation Alex Shi
2020-03-02 11:00 ` [PATCH v9 10/20] mm/lru: take PageLRU first in moving page between lru lists Alex Shi
2020-03-02 11:00 ` [PATCH v9 11/20] mm/memcg: move SetPageLRU out of lru_lock in commit_charge Alex Shi
2020-03-02 11:00 ` [PATCH v9 12/20] mm/mlock: clean up __munlock_isolate_lru_page Alex Shi
2020-03-02 11:00 ` [PATCH v9 13/20] mm/lru: replace pgdat lru_lock with lruvec lock Alex Shi
2020-03-02 11:00 ` [PATCH v9 14/20] mm/lru: introduce the relock_page_lruvec function Alex Shi
2020-03-02 11:00 ` [PATCH v9 15/20] mm/mlock: optimize munlock_pagevec by relocking Alex Shi
2020-03-02 11:00 ` [PATCH v9 16/20] mm/swap: only change the lru_lock iff page's lruvec is different Alex Shi
2020-03-02 11:00 ` [PATCH v9 17/20] mm/pgdat: remove pgdat lru_lock Alex Shi
2020-03-02 11:00 ` [PATCH v9 18/20] mm/lru: revise the comments of lru_lock Alex Shi
2020-03-02 11:00 ` [PATCH v9 19/20] mm/lru: add debug checking for page memcg moving Alex Shi
2020-03-02 11:00 ` [PATCH v9 20/20] mm/memcg: add debug checking in lock_page_memcg Alex Shi
     [not found] ` <20200304031335.9784-1-hdanton@sina.com>
2020-03-04  7:19   ` [PATCH v9 02/20] mm/memcg: fold lock_page_lru into commit_charge Alex Shi

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