Linux perf

1. perf wiki

   Official perf documentation hub.

2. perf tutorial

   perf stat, record, report and annotate walkthrough.

3. perf_event_open(2)

   Syscall for hardware and software counters, sampling and attributes.

4. Perf security

   Privileges and paranoid settings.

5. perf tool documentation

   Source of perf man pages like perf-record and perf-stat.

6. Hardware PMU drivers

   Architecture-specific PMU drivers and events.

7. Kernel tracing

   Tracepoints and ftrace that perf can consume.

Each section links to the official page. Titles and summaries by Extra Credit; the docs belong to their authors.