Re: [PATCH 1/1] mm: vmscan: Reduce throttling due to a failure to make progress

Mel Gorman
2021-12-02T12:16:27Z

On Thu, Dec 02, 2021 at 08:42:29PM +0900, Alexey Avramov wrote:
> I tested this [1] patch on top of 5.16-rc2, the same tests.
>

Thanks for all the tests you've done for this, it's much appreciated.

> - with noswap:
>
> 2021-12-02 19:41:19,279: Stall times for the last 146.5s:
> 2021-12-02 19:41:19,279: -----------
> 2021-12-02 19:41:19,279: some cpu 1.1s, avg 0.8%
> 2021-12-02 19:41:19,279: -----------
> 2021-12-02 19:41:19,279: some io 116.2s, avg 79.3%
> 2021-12-02 19:41:19,280: full io 109.6s, avg 74.8%
> 2021-12-02 19:41:19,280: -----------
> 2021-12-02 19:41:19,280: some memory 3.9s, avg 2.6%
> 2021-12-02 19:41:19,280: full memory 3.8s, avg 2.6%
>
> Excellent!
>
> psi log:
> https://raw.githubusercontent.com/hakavlad/cache-tests/main/516-reclaim-throttle/516-rc2/patch6/noswap/psi
>
> mem log:
> https://raw.githubusercontent.com/hakavlad/cache-tests/main/516-reclaim-throttle/516-rc2/patch6/noswap/mem
>
> - with swappiness=0
>
> 2021-12-02 19:46:04,860: Stall times for the last 144.5s:
> 2021-12-02 19:46:04,860: -----------
> 2021-12-02 19:46:04,860: some cpu 1.1s, avg 0.8%
> 2021-12-02 19:46:04,860: -----------
> 2021-12-02 19:46:04,860: some io 106.9s, avg 74.0%
> 2021-12-02 19:46:04,861: full io 101.3s, avg 70.1%
> 2021-12-02 19:46:04,861: -----------
> 2021-12-02 19:46:04,861: some memory 99.6s, avg 68.9%
> 2021-12-02 19:46:04,861: full memory 95.6s, avg 66.2%
>
> PSI mem pressure was high, but there were no long stalls.
>

Great, so can I assume you're ok with this version? If yes, can I add
the following?

Tested-by: Alexey Avramov <hakavlad@inbox.lv>

--
Mel Gorman
SUSE Labs