Update cheatsheets

valgrind

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# valgrind
+
+> Wrapper for a set of expert tools for profiling, optimizing and debugging programs.
+> Commonly used tools include `memcheck`, `cachegrind`, `callgrind`, `massif`, `helgrind`, and `drd`.
+> More information: <http://www.valgrind.org>.
+
+- Use the (default) Memcheck tool to show a diagnostic of memory usage by `program`:
+
+`valgrind {{program}}`
+
+- Use Memcheck to report all possible memory leaks of `program` in full detail:
+
+`valgrind --leak-check=full --show-leak-kinds=all {{program}}`
+
+- Use the Cachegrind tool to profile and log CPU cache operations of `program`:
+
+`valgrind --tool=cachegrind {{program}}`
+
+- Use the Massif tool to profile and log heap memory and stack usage of `program`:
+
+`valgrind --tool=massif --stacks=yes {{program}}`