Also verified this with stress-ng's memory stressor class.
The system gets under memory pressure to the point of
calling shrink_slab() 10s to 100s thousand times a second
(verified with ftrace; function tracer; shrink_slab filter).
$ sudo stress-ng --class memory --all -1 &
# echo shrink_slab > /sys/kernel/debug/tracing/set_ftrace_filter
# echo function > /sys/kernel/debug/tracing/current_tracer
# cat /sys/kernel/debug/tracing/trace_pipe | awk '{print $4}' | cut -d. -f1 |
uniq -c
24384 998
38792 999
1 EVENTS]
22883 999
1 EVENTS]
1450 999
113849 1000
117025 1001
67285 1002
75768 1003
1 EVENTS]
14496 1003
170817 1004
98136 1005
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https://bugs.launchpad.net/bugs/1817628
Title:
Regular D-state processes impacting LXD containers
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