415d7d774a
On some runs `sleep infinity` run by the user manager uses over 3M of memory, which is higher than the MemoryHigh= set on testbloat and testmunch. If no pgscan is generated, then systemd-oomd sorts by memory usage which leads to a situation where testchill (using 3M) could be targeted over testbloat (1M-2M). Fix this by setting reasonable MemoryHigh= values for all of these test units. Even if somehow testchill throttles a bit at 3M, testbloat and testmunch should still be trying to use over 100M at memory and will throttle down to 5M and 6M with the new values. This should reflect the desired state in pgscan and memory usage during the test run. Fixes #21684
System and Service Manager
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