Option to ignore oom_score completely

[AbsurdlySuspicious]

In my case there's a lot of memory-eager applications which sets themselves oom_score_adj=-1000 and therefore I keep getting xfce4-notifyd (with 25M VmRSS) killed first which occasionally gets an oom_score value of 1 instead of the process that actually ate all of my ram and triggered -m limits (but keeps its oom_score at 0).
I don't really know is that a common problem but anyway, in my opinion it'll be good to have an option to decide which process to kill based exclusively on VmRSS value

[rfjakob]

In my case there's a lot of memory-eager applications

Hi! What kind of applications are we talking about here?

[AbsurdlySuspicious]

Well, in my case these are firefox, intellij idea, lutris (wine launcher), etc. Actually, whenever I open htop with sort by RES, I'm seeing a big wall of zeroes in OOM column, except for several rather small applications. I can figure out that this behavior isn't normal, but I really can't see for a solution other than, for example, forcefully set adj of all processes to zero by cron, which is surely somewhat clumsy approach.

[rfjakob]

Huh, strange! Can you maybe post a screenshot of what you get in htop?

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On Mon, Aug 19, 2019 at 2:47 AM AbsurdlySuspicious ***@***.***> wrote: Well, in my case these are firefox, intellij idea, lutris (wine launcher), etc. Actually, whenever I open htop with sort by RES, I'm seeing a big wall of zeroes in OOM column, except for several rather small applications. I can figure out that this behavior isn't normal, but I'm really can't see for a solution other than, for example, forcefully set adj of all processes to zero by cron, which is surely somewhat clumsy approach. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#140?email_source=notifications&email_token=AACGA753HOGANFEUW6BLSEDQFHURPA5CNFSM4IJ3NJ22YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD4RM5CI#issuecomment-522374793>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AACGA77RUBVB3CHVHUWSG6LQFHURPANCNFSM4IJ3NJ2Q> .

[hakavlad]

firefox, intellij idea, lutris

These applications do not set oom_score_adj=-1000.

@AbsurdlySuspicious Please run https://github.com/hakavlad/nohang/blob/master/oom-sort and print output here. This script prints also oom_score_adj values.

[AbsurdlySuspicious]

@rfjakob @hakavlad

sorted ooms: https://gist.github.com/AbsurdlySuspicious/2cc0988c5261a1ff595b4989c9a8d04e (truncated)

[hakavlad]

@AbsurdlySuspicious Seems like you set OOMScoreAdjust=-1000 in user.slice or in session.scope.

I'd like to see your sudo nohang -p output with extra_table_info = cgroup_v1.
(just clone nohang, change config and start sudo ./nohang -p, output like follow: http://okturing.com/src/6765/body)

[hakavlad]

@AbsurdlySuspicious Try also:

$ grep -sr "OOMScoreAdjust=" "/lib/systemd" "/etc/systemd" "/run/systemd"

It will display units with modified oom_score_adj.
Output like follow:

/lib/systemd/system/snapd.service:OOMScoreAdjust=-900
/lib/systemd/system/systemd-udevd.service:OOMScoreAdjust=-1000
/lib/systemd/system/dbus.service:OOMScoreAdjust=-900
/lib/systemd/system/dm-event.service:OOMScoreAdjust=-1000

[AbsurdlySuspicious]

@hakavlad grep gives me *.service matches only (dbus, dm-event, etc). I'll try running nohang slightly later

[hakavlad]

dbus, dm-event, etc

Please show all output.

[AbsurdlySuspicious]

Binary file /lib/systemd/system-generators/systemd-cryptsetup-generator matches
Binary file /lib/systemd/systemd matches
/lib/systemd/system/postgresql.service:OOMScoreAdjust=-200
/lib/systemd/system/systemd-swap.service:OOMScoreAdjust=-1000
/lib/systemd/system/systemd-udevd.service:OOMScoreAdjust=-1000
/lib/systemd/system/ananicy.service:OOMScoreAdjust=-999
/lib/systemd/system/dbus.service:OOMScoreAdjust=-900
/lib/systemd/system/systemd-coredump@.service:OOMScoreAdjust=500
/lib/systemd/system/dm-event.service:OOMScoreAdjust=-1000
Binary file /lib/systemd/libsystemd-shared-242.so matches

Nothing related to slices or scopes, just like i said

[rfjakob]

My guess: Ananicy does this, see https://github.com/Nefelim4ag/Ananicy/blob/6181b1dd3954c659eae905f0320c9c31562ecdb6/ananicy.py#L228 .
Please try disabling or uninstalling ananicy, reboot, and run oom-sort again.

[rfjakob]

Also, looking at https://gist.github.com/AbsurdlySuspicious/2cc0988c5261a1ff595b4989c9a8d04e , ananicy is the first (lowest PID) process that has a -999 value for oom_score_adj. (other than systemd-udevd, but this has -1000 on my system as well)

[AbsurdlySuspicious]

You're right, it was ananicy, I've disabled oom_score_adj applying and everything is fine now. Thank you guys for helping me with this.

I'd still like you to consider keeping this as low-prio feature request, as it still can be helpful in some cases, even if they're caused by mistake.