systemd-oomd issues on desktop

Fri Jun 10 22:46:08 UTC 2022

Hi,                                                                   

I'm part of the team that worked on the Fedora Change Proposal that   
enabled systemd-oomd by default:
https://fedoraproject.org/wiki/Changes/EnableSystemdOomd              

Joining this discussion late, apologies - I wasn't subscribed to      
ubuntu-devel prior to today, but will try to catch up on the thread on
the archive online.                                                   

I had a discussion about the lack of notification before a kill with  
pabs on the debian-mentors channel recently (while packaging psi-notify
for Debian; Ubuntu PPA is here:                                       
https://launchpad.net/~michel-slm/+archive/ubuntu/psi-notify)         

(both psi-notify and systemd-oomd act on the same pressure information,
but psi-notify just notifies you when certain thresholds while oomd   
kills the cgroup that causes most of the memory pressure to try and
stop                                                
getting to a situation where the kernel does it, and likely pick a
worse                                                
target).

pabs and I agreed that having an actionable notification prior to the
actual                                            
kill would be an improvement, even if the process likely to be killed 
might differ between the notification and the actual kill, and after  
discussing this with the team, Anita published this RFC last week:    

https://github.com/systemd/systemd/issues/23606                       

Given that we have two major distributions now shipping oomd (Fedora  
and Ubuntu -- strictly in chronological order, not implying any value 
judgement here), should we discuss any potential tweak / improvement  
either on the GitHub issue and/or on the systemd-devel mailing list?  

https://lists.freedesktop.org/mailman/listinfo/systemd-devel          

It will probably be good to share as much implementation details as   
possible and get them applied upstream.                               

Best regards,

-- 
Michel Alexandre Salim
identities:
https://keyoxide.org/5dce2e7e9c3b1cffd335c1d78b229d2f7ccc04f2
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