Heikki added the `*0.75` in
commit 11b16614a3
Author: Heikki Linnakangas <heikki@neon.tech>
Date: Tue Mar 28 01:13:33 2023 +0300
Fix test for change in behavior close to the min_resident_size boundary
This PR changed the behavior to match my expectation per my comment:
https://github.com/neondatabase/neon/pull/3809/files#r1149837135
Without it, the test fails because we fall back to global LRU, and we
have an assert on that.
The reason why it falls back to global LRU is that
`target = delta_between_small_and_big_tenant`
doesn't leave any wiggle-room to go over min_resident_size boundary.
But, we redefined min_resident_size to include up to 1 layer above it
in this branch.
Multiply that by two because we're dealing with 2 tenants here.