Re: SwapOnZRAM and how it affects earlyoom thresholds

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On Thu, Jul 9, 2020 at 11:50 AM Rex Dieter <rdieter@xxxxxxxxxxxx> wrote:
>
> Upon reading the SwapOnZRAM feature proposal, I see it is advocating
> allocating 50% of ram for swap.  I'd like folks to consider and evaluate how
> this impacts earlyoom.  It effectively makes the earlyoom memory threshold
> double (right?).  If so, at least think about lowering 4 to (2 or 3), since
> that will make earlyoom's behavior closer to before swaponzram was
> introduced.
>
No objections from me as KDE EarlyOOM change owner. My main concern is
that if someone disables SwapOnZRAM, the effective default EarlyOOM
threshold changes. I don't think there's any easy way to handle that,
but it's an effect we should explicitly take into account.

With my FPgM hat on, I would consider this to be a part of the Swap on
ZRAM proposal, which has been approved by FESCo and so wouldn't
require its own change proposal.

-- 
Ben Cotton
He / Him / His
Senior Program Manager, Fedora & CentOS Stream
Red Hat
TZ=America/Indiana/Indianapolis
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