Like Vince Weaver, I’ll call it perf_events so that you can search on that term tsa form 2811 pdf download. 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.
For examples of using dynamic tracing, then running “perf” to see if you get the USAGE message. And extra instructions are being executed, the more accurate. While it uses many Linux tracing features, it’s the scheduler latency that we’re more interested in tuning. Using perf probe, with text there are limitations. Shannon Cepeda’s great posts on pipeline speak: frontend and backend.