Please forward this error screen to 184. Like Vince Weaver, I’ll call it perf_events gnu linux command line tools summary pdf that you can search on that term later.
Why is the kernel on-CPU so much? Which code-paths are causing CPU level 2 cache misses? Which code-paths are allocating memory, and how much? Is a certain kernel function being called, and how often?
What reasons are threads leaving the CPU? While it uses many Linux tracing features, some are not yet exposed via the perf command, and need to be used via the ftrace interface instead. This page includes my examples of perf_events. Key sections to start with are: Events, One-Liners, Presentations, Prerequisites, CPU statistics, Timed Profiling, and Flame Graphs. This page is under construction, and there’s a lot more to perf_events that I’d like to add.
Hopefully this is useful so far. Screenshot Starting with a screenshot, here’s perf version 3. 1 root root 3458162 Jan 26 03:03 perf. Trace data is written to a perf.
At Kernel Recipes 2017 I gave an updated talk on Linux perf at Netflix, focusing on getting CPU profiling and flame graphs to work. This talk includes a crash course on perf_events, plus gotchas such as fixing stack traces and symbols when profiling Java, Node. There’s also an older version of this talk from 2015, which I’ve posted about. Background The following sections provide some background for understanding perf_events and how to use it. I’ll describe the prerequisites, audience, usage, events, and tracepoints. Prerequisites The perf tool is in the linux-tools-common package.