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joelagnel / bpfd

BPFd (Deprecated, please see README.md) : Berkeley Packet Filter daemon (BPFd). Makes it possible to run BCC tools across systems.
Apache License 2.0
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New tools: Filtering long critical section events #21

Open joelagnel opened 6 years ago

joelagnel commented 6 years ago

Critical section events (t:preemptirq) can be noisy (irq on/off preempt on/off). Using BCC we can write a tool that filters the noise by letting eBPF discard traces of critical sections that are too small in length, to report.