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There may be situations where a cgroup should be protected from killing or deprioritized as a candidate. In FB oomd xattrs are used to bias oomd away from supervisor cgroups and towards worker cgroups in container tasks. On desktops this can be used to protect important units with unpredictable resource consumption. The patch allows systemd-oomd to understand 2 xattrs: "user.oomd_avoid" and "user.oomd_omit". If systemd-oomd sees these xattrs set to 1 on a candidate cgroup (i.e. while attempting to kill something) AND the cgroup is owned by root, it will either deprioritize the cgroup as a candidate (avoid) or remove it completely as a candidate (omit). Usage is restricted to root owned cgroups to prevent situations where an unprivileged user can set their own cgroups lower in the kill priority than another user's (and prevent them from omitting their units from systemd-oomd killing).
8 lines
181 B
Desktop File
8 lines
181 B
Desktop File
[Unit]
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Description=Create some memory pressure
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[Service]
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MemoryHigh=2M
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Slice=testsuite-56-workload.slice
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ExecStart=/usr/lib/systemd/tests/testdata/units/testsuite-56-slowgrowth.sh
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