Re: 6.10/regression/bisected - after f1d97e769152 I spotted increased execution time of the kswapd0 process and symptoms as if there is not enough memory

[Mikhail Gavrilov]

On Sat, Jul 6, 2024 at 10:38 PM Filipe Manana <fdmanana@xxxxxxxxxx> wrote:
> So I've been working on a proper approach following all those test
> results from you and Mikhail, and I would like to ask you both to try
> this branch:
>
> https://git.kernel.org/pub/scm/linux/kernel/git/fdmanana/linux.git/log/?h=test3_em_shrinker_6.10
>
> Again, this is based on 6.10-rc6 plus 3 fixes for this issue you're both having.
>
> Can you guys test that branch?
>
> Thank you a lot for all the time spent on this!

6.10.0-rc6-test1_em_shrinker_6.10
up  1:01
root         269 25.8  0.0      0     0 ?        R    10:59  15:47 [kswapd0]
up  2:00
root         269 25.5  0.0      0     0 ?        S    10:59  30:46 [kswapd0]
up  3:00
root         269 27.9  0.0      0     0 ?        S    10:59  50:18 [kswapd0]
up  4:00
root         269 27.8  0.0      0     0 ?        S    10:59  67:08 [kswapd0]
up  5:00
root         269 27.5  0.0      0     0 ?        S    10:59  83:01 [kswapd0]
up  6:00
root         269 27.5  0.0      0     0 ?        S    10:59  99:31 [kswapd0]
kswapd0 on the test1 branch is bad as
https://gist.githubusercontent.com/fdmanana/9cea16ca56594f8c7e20b67dc66c6c94/raw/557bd5f6b37b65d210218f8da8987b74bfe5e515/gistfile1.txt


6.10.0-rc6-test2_em_shrinker_6.10
up  1:00
root         269 11.7  0.0      0     0 ?        S    19:23   7:03 [kswapd0]
up  2:02
root         269 11.9  0.0      0     0 ?        S    19:23  14:38 [kswapd0]
up  3:00
root         269 11.9  0.0      0     0 ?        S    19:23  21:30 [kswapd0]
up  4:01
root         269 11.2  0.0      0     0 ?        S    19:23  27:15 [kswapd0]
up  5:00
root         269 11.4  0.0      0     0 ?        R    Jul06  34:25 [kswapd0]
up  6:00
root         269 13.9  0.0      0     0 ?        S    Jul06  50:14 [kswapd0]
On the test2 branch, kswapd0 is two times better.


6.10.0-rc6-test3_em_shrinker_6.10 (d22fedf5058d)
up  1:02
root         269 11.0  0.0      0     0 ?        S    09:54   6:50 [kswapd0]
up  2:00
root         269 10.7  0.0      0     0 ?        S    09:54  12:54 [kswapd0]
up  3:00
root         269 10.1  0.0      0     0 ?        S    09:54  18:18 [kswapd0]
up  4:00
root         269  9.5  0.0      0     0 ?        S    09:54  23:03 [kswapd0]
up  5:01
root         269 10.0  0.0      0     0 ?        S    09:54  30:24 [kswapd0]
up  6:00
root         269  9.9  0.0      0     0 ?        S    09:54  35:42 [kswapd0]
On the test3 branch, kswapd0 is thee times better.

To catch up with the 6.9 branch, the timing needs to be 4 times better.

-- 
Best Regards,
Mike Gavrilov.

Attachment: 6.10.0-rc6-test1_em_shrinker_6.10.zip
Description: Zip archive

Attachment: 6.10.0-rc6-test2_em_shrinker_6.10.zip
Description: Zip archive

Attachment: 6.10.0-rc6-test3_em_shrinker_6.10.zip
Description: Zip archive