Re: [Ext2-devel] Re: OOM problems on 2.6.12-rc1 with many fsx tests

[Badari Pulavarty]

Andrew Morton wrote:

> "Martin J. Bligh" <mbligh@xxxxxxxxxxx> wrote:
>
> > > > Nothing beats poking around in a dead machine's guts with kgdb though.
> > >
> > > Everyone his taste.
> > >
> > > But I was surprised by
> > >
> > >
> > > > SwapTotal:     1052216 kB
> > > > SwapFree:      1045984 kB
> > >
> > > Strange that processes are killed while lots of swap is available.
> >
> > I don't think we're that smart about it. If we're really low on mem, it
> > seems we invoke the OOM killer whether processes are causing the problem
> > or not. 
> >
> > OTOH, if we can't free the kernel mem, we don't have much choice, but 
> > it's not really helping much ;-)
>
>
> I'm suspecting here that we simply leaked a refcount on every darn
> pagecache page in the machine.  Note how mapped memory has shrunk down to
> less than a megabyte and everything which can be swapped out has been
> swapped out.

That makes sense. We have almost 485MB in active and inactive caches,
but we are not able reclai them :(

Active:         243580 kB
Inactive:       242248 kB

> If so, then oom-killing everything in the world is pretty inevitable.


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