Date: Fri, 15 Jun 2018 05:09:54 -0400 From: Mark Johnston <markj@freebsd.org> To: Kurt Jaeger <lists@opsec.eu> Cc: FreeBSD current <freebsd-current@freebsd.org> Subject: Re: swapping is completely broken in -CURRENT r334649? Message-ID: <20180615090954.GC32922@pesky.lan> In-Reply-To: <20180615090734.GG4028@home.opsec.eu> References: <d3ee2b8f-bdbe-ce25-f496-6267f9bb0212@FreeBSD.org> <20180605181716.73b8ea91@ernst.home> <2925b27f-43cf-8813-eaa7-4f3d12bef8f0@FreeBSD.org> <20180605214808.GA94301@pesky> <20180615051025.GA79327@ns.kevlo.org> <20180615084022.GA32922@pesky.lan> <20180615084808.GF4028@home.opsec.eu> <20180615090358.GB32922@pesky.lan> <20180615090734.GG4028@home.opsec.eu>
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On Fri, Jun 15, 2018 at 11:07:34AM +0200, Kurt Jaeger wrote:
> Hi!
>
> > > > The change was committed as r334752. Are you seeing unexpected OOM
> > > > kills on or after that revision?
> > >
> > > When I tried to run a qemu-based poudriere run yesterday on a r334918
> > > box, it killed a few processes outside of that run and did not
> > > work out.
> > >
> > > I'm unsure it was because of that problem or a problem with qemu.
> >
> > How much memory and swap does the guest have?
>
> It's started by poudriere, I do not really know.
>
> > Were you consistently able to complete a run before?
>
> Two years ago, on a much lower version of FreeBSD, yes.
>
> I just started it again, and after a while the qemu-ppc64-static
> was at approx. 23 GB memory and increasing, without much progress.
I suspect it is a different issue then.
> > If it's happening during a poudriere run, it may well have been a true
> > OOM situation. The patch below prints a few stats to the dmesg before
> > the kill. The output of that together with "sysctl vm" output should be
> > enough to determine what's happening.
> >
> > diff --git a/sys/vm/vm_pageout.c b/sys/vm/vm_pageout.c
> > index 264c98203c51..9c7ebcf451ec 100644
> > --- a/sys/vm/vm_pageout.c
> > +++ b/sys/vm/vm_pageout.c
> > @@ -1670,6 +1670,8 @@ vm_pageout_mightbe_oom(struct vm_domain *vmd, int page_shortage,
> > * start OOM. Initiate the selection and signaling of the
> > * victim.
> > */
> > + printf("v_free_count: %u, v_inactive_count: %u\n",
> > + vmd->vmd_free_count, vmd->vmd_pagequeues[PQ_INACTIVE].pq_cnt);
> > vm_pageout_oom(VM_OOM_MEM);
> >
> > /*
>
> I'll have a look at this.
>
> --
> pi@opsec.eu +49 171 3101372 2 years to go !
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