> -----Original Message-----
> From: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxx>
> Sent: Tuesday, June 15, 2021 12:09 AM
> To: Sang, Oliver <oliver.sang@xxxxxxxxx>
> Cc: lkp <lkp@xxxxxxxxx>; LKML <linux-kernel@xxxxxxxxxxxxxxx>; lkp@xxxxxxxxxxxx; linux-mm@xxxxxxxxx; akpm@xxxxxxxxxxxxxxxxxxxx;
> mpe@xxxxxxxxxxxxxx; linuxppc-dev@xxxxxxxxxxxxxxxx; kaleshsingh@xxxxxxxxxx; npiggin@xxxxxxxxx; joel@xxxxxxxxxxxxxxxxx; Christophe
> Leroy <christophe.leroy@xxxxxxxxxx>; Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>; Kirill A . Shutemov <kirill@xxxxxxxxxxxxx>
> Subject: [LKP] 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-mrem
> > ap-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@xxxxxxxxxxxxx
>
>
> Instead of pud lock we are now using rmap lock with mremap.
>
> Can you check with that series?
Hi Aneesh,
Could you please specify the base commit of the patch series?
We have applied new patch series(rmap lock with mremap) on commit 027f55e87c30 (tty: hvc: udbg_hvc: retry putc on -EAGAIN), and it shows no regression after patch.
=========================================================================================
compiler/cpufreq_governor/kconfig/nr_ssd/nr_task/rootfs/runtime/tbox_group/test/testcase/thp_defrag/thp_enabled/uco
de:
gcc-9/performance/x86_64-rhel-8.3/1/8/debian-10.4-x86_64-20200603.cgz/300/lkp-csl-2ap1/swap-w-seq-mt/vm-scalabili
ty/always/never/0x4003006
commit:
027f55e87c30 (tty: hvc: udbg_hvc: retry putc on -EAGAIN) <--- patch's base commit
ecf8443e51a8 (mm/mremap: Fix race between MOVE_PUD mremap and pageout) <--- first bad commit
57da7477067d (fixup) <--- apply patch on 027f55e87c30
027f55e87c309427 ecf8443e51a862b261313c2319a 57da7477067dbe29247484eda0e
---------------- --------------------------- ---------------------------
%stddev %change %stddev %change %stddev
\ | \ | \
371814 ± 3% -29.1% 263582 ± 3% -0.1% 371286 ± 2% vm-scalability.median
We also tried to apply patches on commit ecf8443e51a8 (mm/mremap: Fix race between MOVE_PUD mremap and pageout), and the regression increased to -33.9%
=========================================================================================
compiler/cpufreq_governor/kconfig/nr_ssd/nr_task/rootfs/runtime/tbox_group/test/testcase/thp_defrag/thp_enabled/uco
de:
gcc-9/performance/x86_64-rhel-8.3/1/8/debian-10.4-x86_64-20200603.cgz/300/lkp-csl-2ap1/swap-w-seq-mt/vm-scalabili
ty/always/never/0x4003006
commit:
5f80ee2fc08b (mm/mremap: Fix race between MOVE_PUD mremap and pageout) <--- first bad commit's parent
ecf8443e51a8 (mm/mremap: Fix race between MOVE_PMD mremap and pageout) <--- first bad commit
8ae369d45894 (fixup) <--- apply patch on ecf8443e51a8
5f80ee2fc08b3613 ecf8443e51a862b261313c2319a 8ae369d4589492c7f7198cd742d
---------------- --------------------------- ---------------------------
%stddev %change %stddev %change %stddev
\ | \ | \
373210 -29.4% 263582 ± 3% -33.9% 246626 ± 2% vm-scalability.median
Thanks
> -aneesh
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