wow, looking at the systemd code (even upstream), oomd is counting pagecache as 'used' memory which is massively unfair as the kernel is responsible for pagecache use, not userspace, and it's not even accurate (from a OOM perspective) since the kernel will drop pagecache as memory pressure increases.
Definitely some discussion and patching needs to happen upstream in systemd I think. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1966381 Title: applications crash that never crashed under Ubuntu-20.04 Status in systemd package in Ubuntu: New Status in systemd source package in Jammy: New Bug description: Just now I was watching some video in Firefox. I popped over to another virtual workspace for a few minutes, and when I popped back to Firefox it had gone. The same thing had been happening all week (I installed fresh Ubuntu-22.04 last week) with Chrome, Firefox and Thunderbird. This time instead of shrugging it off I looked in the logs, and found this Mar 25 19:45:40 ubuntu systemd-oomd[960]: Killed /user.slice/user-1001.slice/user@1001.service/app.slice/app-gnome-firefox-6607.scope due to memory used (15940579328) / total (16153944064) and swap used (925564928) / total (1023406080) being more than 90.00% Mar 22 08:11:29 ubuntu systemd[5029]: app-gnome-google\x2dchrome-5412.scope: systemd-oomd killed 298 process(es) in this unit. Mar 23 11:09:28 ubuntu systemd-oomd[1055]: Killed /user.slice/user-1001.slice/user@1001.service/app.slice/app-gnome-thunderbird-5418.scope due to memory used (15591993344) / total (16149745664) and swap used (927760384) / total (1023406080) being more than 90.00% Mar 23 11:09:28 ubuntu systemd[5029]: app-gnome-thunderbird-5418.scope: systemd-oomd killed 173 process(es) in this unit. I know it's saying those three entirely unrelated applications had suddenly decided to swallow all the RAM+swap on this laptop of mine - but the very same apps didn't act like that last week under Ubuntu-20.04, so I suspect something else is going on I can't say they hadn't swallowed all the RAM, but there is ZERO sign of a system on the verge of collapsing - everything has been screaming along just nicely - no sign of the "staggering" you normally get when the OS is heavily into swap. However, now that I look I see my 16G laptop only has 1G swap??? I just let the Ubuntu installer do it's defaults - but it used to auto- choose 1xRAM or 2xRAM - what's with this 1G swap? Could that be related? ProblemType: Bug DistroRelease: Ubuntu 22.04 Package: systemd-oomd 249.11-0ubuntu1 ProcVersionSignature: Ubuntu 5.15.0-23.23-generic 5.15.27 Uname: Linux 5.15.0-23-generic x86_64 ApportVersion: 2.20.11-0ubuntu79 Architecture: amd64 CasperMD5CheckResult: pass CurrentDesktop: ubuntu:GNOME Date: Fri Mar 25 19:47:44 2022 InstallationDate: Installed on 2022-03-13 (11 days ago) InstallationMedia: Ubuntu 22.04 LTS "Jammy Jellyfish" - Alpha amd64 (20220313) SourcePackage: systemd UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1966381/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
