Re: Running out of memory in 4.0?

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

On Mon, Dec 01, 2008 at 08:35:58PM +0100, Havard Eidnes wrote:
> > Looks a lot like kern/40027. I've seen it mostly on netbsd-5
> > and -current, but a 4.0 domU managed to exibit this symptoms
> > too (it has swap on xbd, not on NFS though). As in my case,
> > there is still some memory that could be reclaimed from the
> > pagedaemon, but it fails to do so, and seems to be in a loop
> > ...
> 
> Yes, this does indeed look similar to that problem report and the
> mail thread refrenced therein.
> 
> Going back to my own submission I find:
> 
>   127927 VM pages: 76357 active, 38080 inactive, 2422 wired, 7 free
>   pages  73990 anon, 37343 file, 4129 exec
> and
>     swpages=128000, swpginuse=128000, swpgonly=127997, paging=0
> 
> so I'm actually also out of virtual memory, since all swap pages
> are in use.

swpginuse counts the number of swap pages assigned. swpgonly counts which of
those we need to preserve (because their contents are not in core). A page
can be swap backed but resident.

> However, "something" ought to be able to find a victim to kill or do
> something else (steal an exec page?, or steal a non-modified anon page, if
> there are any...)

Right. I will try to reproduce the problem.

Andrew