In this session, Tanel introduces a new open source eBPF tool for efficiently sampling both on-CPU events and off-CPU events for every thread (task) in the OS. Linux standard performance tools (like perf) allow you to easily profile on-CPU threads doing work, but if we want to include the off-CPU timing and reasons for the full picture, things get complicated. Combining eBPF task state arrays with periodic sampling for profiling allows us to get both a system-level overview of where threads spend their time, even when blocked and sleeping, and allow us to drill down into individual thread level, to understand why.
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