Re: earlyoom by default

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On Mon, Jan 6, 2020 at 7:56 PM Dusty Mabe <dusty@xxxxxxxxxxxxx> wrote:
> For cloud at least it's very common to not have swap. I'd argue for servers
> you don't want them swapping either but resources aren't quite as elastic as
> in the cloud so you might not be able to burst resources like you can in the cloud.

There's also discussion about making oomd a universal solution for
this; but I came across this issue asserting PSI (kernel pressure
stall information) does not work well without swap.

Ignoring whether+what+when a workaround may be found for that, what do
you think about always having swap-on-ZRAM enabled in these same
environments? The idea there is a configurable size /dev/zram block
device (basically a compressible RAM disk) on which swap is created.
Based on discussions with anaconda, IoT, Workstation, and systemd
folks - I think there's a potential to converge on systemd-zram
generator (rust) to do this.

Workstation wg is mulling over the idea of dropping separate swap
partitions entirely, and using a swap-on-ZRAM device instead; possibly
with a dynamically created swapfile for certain use cases like
hibernation. So I'm curious if this might have broader appeal, and get
systemd-zram generator production ready.

Chris Murphy
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