Update cheatsheets

linux/perf

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# perf
+
+> Framework for Linux performance counter measurements.
+> More information: <https://perf.wiki.kernel.org>.
+
+- Display basic performance counter stats for a command:
+
+`perf stat {{gcc hello.c}}`
+
+- Display system-wide real-time performance counter profile:
+
+`sudo perf top`
+
+- Run a command and record its profile into `perf.data`:
+
+`sudo perf record {{command}}`
+
+- Record the profile of an existing process into `perf.data`:
+
+`sudo perf record -p {{pid}}`
+
+- Read `perf.data` (created by `perf record`) and display the profile:
+
+`sudo perf report`