Enable USDT probes for eBPF tracing on Linux

[cmbntr]

Please enable (or provide a build variant) with enabled USDT probes.

These probes can be used with the eBPF tracing on Linux:
http://www.brendangregg.com/blog/2019-01-01/learn-ebpf-tracing.html
https://github.com/iovisor/bcc
https://github.com/iovisor/bpftrace

"Profiling JVM Applications in Production"

The Redhat OpenJDK builds already have them enabled.

$ cat /etc/redhat-release
Red Hat Enterprise Linux release 8.0 (Ootpa)

$ /usr/lib/jvm/java-1.8.0-openjdk/bin/java -version
openjdk version "1.8.0_212"
OpenJDK Runtime Environment (build 1.8.0_212-b04)
OpenJDK 64-Bit Server VM (build 25.212-b04, mixed mode)

$ tplist -l /usr/lib/jvm/java-1.8.0-openjdk/jre/lib/amd64/server/libjvm.so | grep hotspot | wc -l
515

$ adoptopenjdk/jdk8/bin/java -version
openjdk version "1.8.0_212"
OpenJDK Runtime Environment (AdoptOpenJDK)(build 1.8.0_212-b04)
OpenJDK 64-Bit Server VM (AdoptOpenJDK)(build 25.212-b04, mixed mode)

$ tplist -l adoptopenjdk/jdk/jre/lib/amd64/server/libjvm.so | grep hotspot | wc -l
0

[yzhao1012]

Could there be some update on the progress? We'd like USDT to be built-in to enable eBPF probing.

[wsargent]

Some links for the curious:

• https://web.archive.org/web/20161006014657/http://blogs.microsoft.co.il/sasha/2016/03/31/probing-the-jvm-with-bpfbcc/
• https://github.com/goldshtn/linux-tracing-workshop/blob/master/bpf-usdt.md
• https://web.archive.org/web/20161203062506/http://blogs.microsoft.co.il/sasha/2016/03/30/usdt-probe-support-in-bpfbcc/
• https://assets.ctfassets.net/oxjq45e8ilak/2KmV3daziwmWGeyIye8Kmy/3b9d739704dcc1292712c1374124b8d4/Sasha-Goldshtein_Monitoring-JVM-applications-with-BPF-magic.pdf
• https://www.acticloud.eu/storage/app/uploads/public/5ce/d1a/e36/5ced1ae36ceba475001781.pdf