Linux内核驱动开发，性能瓶颈往往隐藏在锁竞争与上下文切换的细节里。某知名云计算厂商的虚拟网卡驱动曾遭遇这样的困境：当并发连接数突破百万级时，系统吞吐量骤降70%，P99延迟飙升至秒级。通过perf与eBPF的联合诊断，工程师发现驱动中一处全局锁的持有时间占比超过35%，同时上下文切换频率高达每秒280万次。这场性能危机揭示了一个关键事实：在高速硬件与复杂软件交织的现代系统中，锁与上下文切换已成 ...

KDAB, a German consulting firm that develops graphics and visualization tools, has released Hotspot 1.0, a GUI too for visualizing performance data generated by the Linux perf tool. Perf analyzes ...

For more than two years, the Linux operating system has contained a high-severity vulnerability that gives untrusted users with restricted accounts nearly unfettered “root” access over machines, ...