linux-kernel - Re: [linus:master] [mm] c0bff412e6: stress-ng.clone.ops_per

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Message-ID: <f4ddda8d-3513-4471-8609-acb3ce29219e@intel.com>
Date: Wed, 14 Aug 2024 11:02:31 +0800
From: Yin Fengwei <fengwei.yin@...el.com>
To: Mateusz Guzik <mjguzik@...il.com>
CC: David Hildenbrand <david@...hat.com>, kernel test robot
	<oliver.sang@...el.com>, Peter Xu <peterx@...hat.com>,
	<oe-lkp@...ts.linux.dev>, <lkp@...el.com>, <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>, Huacai Chen
	<chenhuacai@...nel.org>, Jason Gunthorpe <jgg@...dia.com>, Matthew Wilcox
	<willy@...radead.org>, Nathan Chancellor <nathan@...nel.org>, Ryan Roberts
	<ryan.roberts@....com>, WANG Xuerui <kernel@...0n.name>,
	<linux-mm@...ck.org>, <ying.huang@...el.com>, <feng.tang@...el.com>
Subject: Re: [linus:master] [mm] c0bff412e6: stress-ng.clone.ops_per_sec -2.9%
 regression

On 8/13/24 03:14, Mateusz Guzik wrote:
> thanks for testing
> 
> would you mind benchmarking the change which merely force-inlines _compund_page?
> 
> https://lore.kernel.org/linux-mm/66c4fcc5-47f6-438c-a73a-3af6e19c3200@redhat.com/
This change can resolve the regression also:
=========================================================================================
tbox_group/testcase/rootfs/kconfig/compiler/nr_threads/testtime/test/cpufreq_governor/debug-setup:
 
lkp-icl-2sp8/stress-ng/debian-12-x86_64-20240206.cgz/x86_64-rhel-8.3/gcc-12/100%/60s/clone/performance/yfw_test2

commit:
   9cb28da54643ad464c47585cd5866c30b0218e67  parent commit
   c0bff412e67b781d761e330ff9578aa9ed2be79e  commit introduced regression
   450b96d2c4f740152e03c6b79b484a10347b3ea9  the change proposed by David
                                             in above link

9cb28da54643ad46 c0bff412e67b781d761e330ff95 450b96d2c4f740152e03c6b79b4
---------------- --------------------------- ---------------------------
          %stddev     %change         %stddev     %change         %stddev
              \          |                \          |                \
       2906            +3.5%       3007            +0.4%       2919 
   stress-ng.clone.microsecs_per_clone
     562884            -2.9%     546575            -0.6%     559718 
   stress-ng.clone.ops
       9295            -2.9%       9028            -0.5%       9248 
   stress-ng.clone.ops_per_sec



Regards
Yin, Fengwei