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Overview Performance profiling is a core SRE skill. Linux provides a rich set of performance analysis tools, from the simple top to the powerful perf/eBPF — each with its applicable scenario. Knowing when and how to use these tools is key to quickly identifying performance bottlenecks. This article systematically covers the Linux performance profiling toolkit across five dimensions — CPU, memory, IO, network, and comprehensive tools — and provides use-case quick reference tables and real-world examples....