• At the end of __wt_page_can_evict, we check if the WT_REF_FLAG_PREFETCH flag is set and return false if that's the case as we don't want to evict a page that has this flag.
• However, we can early return true before that check. This means we can try to evict a page that has the prefetch flag on it.
• Furthermore, __wt_page_can_evict can also be called from __evict_force_check , and early return, here as well.

If we should not evict a page that has the prefetch flag on, we should check this first before potentially returning true.