Re: [LKP] [mm] ac5b2c1891: vm-scalability.throughput -61.3% regression

From: Linus Torvalds
Date: Wed Nov 28 2018 - 11:49:09 EST

On Tue, Nov 27, 2018 at 7:20 PM Huang, Ying <ying.huang@xxxxxxxxx> wrote:
> From the above data, for the parent commit 3 processes exited within
> 14s, another 3 exited within 100s. For this commit, the first process
> exited at 203s. That is, this commit makes memory allocation more fair
> among processes, so that processes proceeded at more similar speed. But
> this raises system memory footprint too, so triggered much more swap,
> thus lower benchmark score.
> In general, memory allocation fairness among processes should be a good
> thing. So I think the report should have been a "performance
> improvement" instead of "performance regression".

Hey, when you put it that way...

Let's ignore this issue for now, and see if it shows up in some real
workload and people complain.