Switch from uprobes to usdt for tracing #352
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Attaching uprobes if fickle and requires function attributes to work properly. Let's switch to usdt, which have no such downside. The price we pay is a dependecy on `systemtap-sdt-dev`, which is manageable. We get nicer attachment code with `BPF_USDT` as a bonus. The usdt probes can be inspected: ``` ivan@vm:~/projects/ebpf_exporter$ sudo tplist-bpfcc -vv -l tracing/demos/cfs-throttling/demo ebpf_exporter:cfs_set_parent_span [sema 0x0] location #1 tracing/demos/cfs-throttling/demo 0x92f3cc argument #1 8 unsigned bytes @ regs[10] argument cloudflare#2 8 unsigned bytes @ regs[9] argument cloudflare#3 8 unsigned bytes @ regs[8] location cloudflare#2 tracing/demos/cfs-throttling/demo 0x92f408 argument #1 8 unsigned bytes @ regs[13] argument cloudflare#2 8 unsigned bytes @ regs[11] argument cloudflare#3 8 unsigned bytes @ regs[8] ebpf_exporter:cfs_clear_parent_span [sema 0x0] location #1 tracing/demos/cfs-throttling/demo 0x92f3d8 location cloudflare#2 tracing/demos/cfs-throttling/demo 0x92f3e0 ```
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Attaching uprobes if fickle and requires function attributes to work properly. Let's switch to usdt, which have no such downside. The price we pay is a dependecy on
systemtap-sdt-dev, which is manageable.We get nicer attachment code with
BPF_USDTas a bonus.The usdt probes can be inspected: