• enlarge tlb size:
• need to improve tlb flush time
• two approaches:
• first improve structure of TLB structure
• use helper thread to help flushing tlb
• Address Space ID: ASID
• 鬼打牆
• 在 i73 上會 segfault in cpu_unlink_tb
• why???
• ALL LOCKED!!!!

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• in cross-page block linking, cross-page links may be changed from VALID to INVALID.
• When will this change happen?
•