systemd-oomd only monitors and kills within a selected cgroup subtree For memory pressure kills, this means it's unnecessary to get the pgscan rate across all the monitored memory pressure cgroups. The increase will show up whether we do a total sum or not, but since we only care about the increase in the subtree we're about to target for a kill, we can simplify the code a bit by not doing this total sum.
System and Service Manager
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