Re: [LKP] [lkp-robot] [mm, mlock, vmscan] 9c4e6b1a70: stress-ng.hdd.ops_per_sec -7.9% regression

[Ye Xiaolong]

On 02/26, Ye Xiaolong wrote:
>Hi, Shakeel 
>
>On 02/25, Shakeel Butt wrote:
>>On Sun, Feb 25, 2018 at 6:44 AM, kernel test robot
>><xiaolong.ye@xxxxxxxxx> wrote:
>>>
>>> Greeting,
>>>
>>> FYI, we noticed a -7.9% regression of stress-ng.hdd.ops_per_sec due to commit:
>>>
>>>
>>> commit: 9c4e6b1a7027f102990c0395296015a812525f4d ("mm, mlock, vmscan: no more skipping pagevecs")
>>> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
>>>
>>> in testcase: stress-ng
>>> on test machine: 88 threads Intel(R) Xeon(R) CPU E5-2699 v4 @ 2.20GHz with 128G memory
>>> with following parameters:
>>>
>>
>>Hi Xiaolong,
>>
>>Is there a way I can get the output of "perf record -a -g" running in
>>parallel to the actual test on this machine. As I have mentioned
>>before I am not able to reproduce this issue. However I am trying to
>>repro on a VM with 4 vcpus and 4 GiB memory and I don't see any
>>difference. I am suspecting that it may repro on a larger machine but
>>I don't have access to one.
>>
>
>perf.data attached. It was generated via `perf record -q -ag --realtime=1 -m 256`

Attached perf-profile.gz is the result of `perf report` result.

Thanks,
Xiaolong
>
>Thanks,
>Xiaolong
>
>>thanks,
>>Shakeel
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