Re: port-amd64/54988: possible memory leaks/swap problems

[Andrew Doran <ad%netbsd.org@localhost>]

On Wed, Mar 04, 2020 at 04:30:04PM -0500, MLH wrote:

> MLH wrote:
> > The following reply was made to PR port-amd64/54988; it has been noted by GNATS.
> >  
> >  Any idea on what is preventing the memory from being released and
> >  why it just locks up?
> 
> With the changes to -current as of NetBSD 9.99.48 Sun Mar  1 17:38:46
> EST 2020, the complete lockups I was seeing when the 4G of phymem
> was exhausted as well as the other issues seems to have been somewhat
> resolved.
> 
> The largest improvements were last week when the big uvm changes
> were checked in but I haven't seen a lockup since the last couple
> of changes made on Sat or Sun. Those appear to have finally made
> this system stable enough to use again, though there still appear
> to be memory alloc/dealloc and swap issues because I have to reboot
> at least once a day when phymem is exhausted and the system becomes
> unusable due to severe swapping. This is when basically nothing is
> still running and disc cache is only taking up a tiny bit of phymem
> and only a tiny bit of swap appears to be in use.

Thanks for reporting.  Not to put a downer on things, but the UVM jumbo
commit was largely a mechnical one to change lock types. Any corrective
effect is by chance.  Still investigation to do here.

Cheers,
Andrew