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List:       fedora-devel-list
Subject:    Re: Fedora 32 System-Wide Change proposal (late): Enable EarlyOOM
From:       Michael Catanzaro <mcatanzaro () gnome ! org>
Date:       2020-01-07 15:19:47
Message-ID: 1578410387.2801.2 () posteo ! net
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On Tue, Jan 7, 2020 at 5:27 am, Mark Otaris <mark@net-c.com> wrote:
> Try it. With a memory limit,
> 
> podman run --rm -it --memory=1G fedora bash -c 'dnf install -y 
> stress-ng && stress-ng --malloc 100 --memcpy 100 --mmap 100 --vm 100'
> 
> will use CPU but keep your system responsive. Without the memory limit
> (this will hang your system),
> 
> podman run --rm -it fedora bash -c 'dnf install -y stress-ng && 
> stress-ng --malloc 100 --memcpy 100 --mmap 100 --vm 100'
> 
> the system hangs and doesn't recover after 15 minutes.

I don't think we can use this, though; or at least, I don't see how. 
systemd allows limiting the memory accessible to a scope, but it 
doesn't allow carving out memory for one particular scope that is not 
to be accessible to other scopes. So I don't see a way to use these 
memory limits to ensure sufficient memory remains available to critical 
session processes. (Am I missing something?)

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