Speaker: Ivan Babrou
While there are plenty of readily available metrics for monitoring the Linux kernel, many gems remain hidden. With the help of recent developments in eBPF, it is now possible to run safe programs in the kernel to collect arbitrary information with little to no overhead. A few examples include:
Disk latency and IO size histograms
Run queue (scheduler) latency
Page cache efficiency
Directory cache efficiency
LLC (aka L3 cache) efficiency
Kernel timer counters
System-wide TCP retransmits
Practically any event from "perf list" output and any kernel function can be traced, analyzed, and turned into a metric with almost arbitrary labels attached to it.
If you are already familiar with BCC tools, you may think of ebpf_exporter as BCC tools turned into Prometheus metrics.
In this talk we'll go over eBPF basics, how to write programs and get insights into a running system.
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