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iosnoop For Linux edit / delete
"How does this work? It's just a shell script!" Linux's ftrace facility turns out to be surprisingly capable... and there are a whole load of neat scripts that use it in perf-tools.
to debugging ftrace linux perf performance tracing ... on 14 October 2016
Tutorial - Perf Wiki edit / delete
Decent overview of what perf can do. I've been using this a lot for benchmarking lately; it's pretty neat.
to benchmark linux perf performance software ... on 29 June 2012
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tasty by Adam Sampson.