Hello. On Tue, Aug 22, 2023 at 01:59:52PM -0700, Christian Hergert <chergert@xxxxxxxxxx> wrote: > The primary thing I see showing up when profiling an idle system is oomd. My > casual reading through the code would lead me to believe it's waking up a > CPU every .15 seconds. That coincides with swap monitoring timer. > Is there a way we could have this wake up less? My goal here is to iron out > all the little things which are causing energy drain when idle. Do you have any "Swap Monitored CGroups:" in output of `oomctl dump`? I think the loop's event source could be disabled when no cgroups require swap monitoring [1] (and enabled lazily when such are configured). Not sure whether/how much SWAP_INTERVAL_USEC could be increased to retain responsiveness. HTT, Michal [1] https://github.com/systemd/systemd/blob/1925f829ab17cee7d65cc8c350d8281f8f41588e/src/oom/oomd-manager.c#L375
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