linux-kernel - Re: [mm/mremap] ecf8443e51: vm-scalability.throughput -29.4% regression

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Message-ID: <a815a022-cf3e-fe4b-ee23-191523ed1980@linux.ibm.com>
Date:   Mon, 14 Jun 2021 21:38:44 +0530
From:   "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>
To:     kernel test robot <oliver.sang@...el.com>
Cc:     0day robot <lkp@...el.com>, LKML <linux-kernel@...r.kernel.org>,
        lkp@...ts.01.org, ying.huang@...el.com, feng.tang@...el.com,
        zhengjun.xing@...ux.intel.com, linux-mm@...ck.org,
        akpm@...ux-foundation.org, mpe@...erman.id.au,
        linuxppc-dev@...ts.ozlabs.org, kaleshsingh@...gle.com,
        npiggin@...il.com, joel@...lfernandes.org,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        "Kirill A . Shutemov" <kirill@...temov.name>
Subject: Re: [mm/mremap] ecf8443e51: vm-scalability.throughput -29.4%
 regression

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