Re: [linus:master] [migrate_pages] 7e12beb8ca: vm-scalability.throughput -3.4% regression

[Huang, Ying]

Hi, Yujie,

kernel test robot <yujie.liu@xxxxxxxxx> writes:

> Hello,
>
> FYI, we noticed a -3.4% regression of vm-scalability.throughput due to commit:
>
> commit: 7e12beb8ca2ac98b2ec42e0ea4b76cdc93b58654 ("migrate_pages: batch flushing TLB")
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
>
> in testcase: vm-scalability
> on test machine: 96 threads 2 sockets Intel(R) Xeon(R) Platinum 8260L CPU @ 2.40GHz (Cascade Lake) with 128G memory
> with following parameters:
>
> 	runtime: 300s
> 	size: 512G
> 	test: anon-cow-rand-mt
> 	cpufreq_governor: performance
>
> test-description: The motivation behind this suite is to exercise functions and regions of the mm/ of the Linux kernel which are of interest to us.
> test-url: https://git.kernel.org/cgit/linux/kernel/git/wfg/vm-scalability.git/
>
>
> If you fix the issue, kindly add following tag
> | Reported-by: kernel test robot <yujie.liu@xxxxxxxxx>
> | Link: https://lore.kernel.org/oe-lkp/202303192325.ecbaf968-yujie.liu@xxxxxxxxx
>

Thanks a lot for report!  Can you try whether the debug patch as
below can restore the regression?

Best Regards,
Huang, Ying

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