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Subject: Re: [mm/mremap] ecf8443e51: vm-scalability.throughput -29.4%
 regression
To: kernel test robot <oliver.sang@intel.com>
References: <20210614145536.GB28801@xsang-OptiPlex-9020>
From: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Message-ID: <a815a022-cf3e-fe4b-ee23-191523ed1980@linux.ibm.com>
Date: Mon, 14 Jun 2021 21:38:44 +0530
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Cc: feng.tang@intel.com, 0day robot <lkp@intel.com>, linux-mm@kvack.org,
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On 6/14/21 8:25 PM, kernel test robot wrote:
> 
> 
> Greeting,
> 
> FYI, we noticed a -29.4% regression of vm-scalability.throughput due to commit:
> 
> 
> commit: ecf8443e51a862b261313c2319ab4e4aed9e6b7e ("[PATCH v7 02/11] mm/mremap: Fix race between MOVE_PUD mremap and pageout")
> url: https://github.com/0day-ci/linux/commits/Aneesh-Kumar-K-V/Speedup-mremap-on-ppc64/20210607-135424
> base: https://git.kernel.org/cgit/linux/kernel/git/powerpc/linux.git next
> 
>

We dropped that approach and is now using 
https://lore.kernel.org/linux-mm/20210610083549.386085-1-aneesh.kumar@linux.ibm.com 


Instead of pud lock we are now using rmap lock with mremap.

Can you check with that series?

-aneesh