The original title is "Linux Performance Troubleshooting: The 60-Second Check and Beyond"

Short summary

A practical Linux performance troubleshooting guide starting with a 60-second checklist (uptime, dmesg, vmstat, mpstat, pidstat, iostat, free, ss, sar) to quickly isolate which subsystem is failing. It then drills into CPU profiling with perf and flamegraphs, memory pressure diagnosis, disk I/O latency analysis, and network debugging. Includes a decision tree for choosing the right tool per symptom.

• •60-second checklist covers CPU, memory, disk, and network in one pass
• •perf + flamegraphs for CPU hot-spot analysis with production-safe overhead
• •Decision tree maps symptoms to the right diagnostic tool

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