Hi Chris, A couple of dumb questions. In your test, do you have any of the following configured / enabled? /proc/sys/vm/laptop_mode memory.low memory.min Besides that, it looks like the place non-MGLRU reclaim wakes up the flushers is in shrink_inactive_list() (which calls wakeup_flusher_threads()). Since MGLRU calls shrink_folio_list() directly (from evict_folios()), I agree it looks like it simply will not do this. Yosry pointed out [1], where MGLRU used to call this but stopped doing that. It makes sense to me at least that doing writeback every time we age is too aggressive, but doing it in evict_folios() makes some sense to me, basically to copy the behavior the non-MGLRU path (shrink_inactive_list()) has. I can send a patch which tries to implement this next week. In the meantime, Yu, please let me know if what I've said here makes no sense for some reason. :) [1]: https://lore.kernel.org/lkml/YzSiWq9UEER5LKup@xxxxxxxxxx/
