https://jasper-aa64.github.io/tags/pcid/Recent content in Pcid on JasperHugoen-usWed, 04 Nov 2026 00:00:00 +0000https://jasper-aa64.github.io/posts/low-latency-context-switch-page-table-tlb/Wed, 04 Nov 2026 00:00:00 +0000https://jasper-aa64.github.io/posts/low-latency-context-switch-page-table-tlb/Threads are lighter than processes because the TLB and caches stay usable after the switch, not because the switch itself is cheaper. The TLB has no MESI: when any thread in a process changes the page tables, every core still holding that page table gets interrupted, and pinning and isolcpus cannot prevent it, so once a hot-path process is running its address space is read-only.