Thanks for responding! Comments inline. On 8/25/23 7:54 AM, Michal Koutný wrote:
Do you have any "Swap Monitored CGroups:" in output of `oomctl dump`?
"Swap Monitored CGroups:" appears to be empty on the three physical machines I have at my disposal to test. (Fedora 38, Fedora 39, and GNOME OS).
I think the loop's event source could be disabled when no cgroups require swap monitoring [1] (and enabled lazily when such are configured).
That sounds like a great idea!
Not sure whether/how much SWAP_INTERVAL_USEC could be increased to retain responsiveness.
Given the empirical evidence here of all these machines not having swap monitoring to begin with, I think the interval is less of an issue compared to dynamic event sources.
As it were, things like thermald are waking up every 4 seconds when the underlying hardware doesn't support async notification. It would be fantastic if we had a poll() mechanism that would coalesce the sorts of wake-ups across processes.
-- Christian
