Date: Fri, 15 Jun 2018 11:07:34 +0200 From: Kurt Jaeger <lists@opsec.eu> To: Mark Johnston <markj@freebsd.org> Cc: FreeBSD current <freebsd-current@freebsd.org> Subject: Re: swapping is completely broken in -CURRENT r334649? Message-ID: <20180615090734.GG4028@home.opsec.eu> In-Reply-To: <20180615090358.GB32922@pesky.lan> 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>
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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.
> 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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