<?xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Pcid on Jasper</title><link>https://jasper-aa64.github.io/zh/tags/pcid/</link><description>Recent content in Pcid on Jasper</description><generator>Hugo</generator><language>zh-CN</language><lastBuildDate>Wed, 04 Nov 2026 00:00:00 +0000</lastBuildDate><atom:link href="https://jasper-aa64.github.io/zh/tags/pcid/index.xml" rel="self" type="application/rss+xml"/><item><title>低时延交易 —— 上下文切换、页表与 TLB</title><link>https://jasper-aa64.github.io/zh/posts/low-latency-context-switch-page-table-tlb/</link><pubDate>Wed, 04 Nov 2026 00:00:00 +0000</pubDate><guid>https://jasper-aa64.github.io/zh/posts/low-latency-context-switch-page-table-tlb/</guid><description>线程比进程轻，轻在切换之后 TLB 和缓存还能接着用，不在切换本身。TLB 没有 MESI：同一个进程里任何一个线程改了页表，此刻还装着这份页表的核都要被打断一次，绑核和 isolcpus 挡不住，所以热路径进程跑起来以后地址空间只读不改。</description></item></channel></rss>