swapping is completely broken in -CURRENT r334649?

[Mark Johnston]

On Wed, Jun 06, 2018 at 12:22:08AM +0300, Lev Serebryakov wrote:
> On 05.06.2018 19:17, Gary Jennejohn wrote:
> 
> 
> > I complained about this also and alc@ gave me this hint:
> > 	sysctl vm.pageout_update_period=0
> 
>  Really, situation is worse than stated in subject, because processes
> are being killed AFTER memory pressure, when here are a lot of free
> memory already!
> 
>  It looks like very serious bug.

The issue was identified earlier this week and is being worked on. It's
a regression from r329882 which appears only on certain hardware. You
can probably work around it by setting vm.pageout_oom_seq to a large
value (try 1000 for instance), though this will make the "true" OOM
killer take longer to kick in. The problem is unrelated to the
pageout_update_period.