Upgraded from #Debian Bullseye to Bookworm earlier. Everything went smoothly, just had to remove ZFS before to save delays rebuilding. After a long delay on reboot, system came up. Emacs & Firefox wouldn't spawn windows properly. Zapped their hidden settings directories to start again jump started things, but again things stalled.
#bpftrace execsnoop managed to shed some light on what's actually going on with #Emacs - it's busy compiling away in the background which I guess is blocking everything on start. Haven't looked at what's going on with Firefox yet.

Today I used #bpftrace on a #Linux system to investigate a performance issue. Really took me back to my days working on #Solaris at Sun Microsystems. I used #dtrace quite a bit at that time, and it's good to see the same good ideas thriving in Linux.

I worked in #AIX development at #IBM for many years, and I was always a little sad that people didn't use #probevue more. Perhaps this is because AIX has a good system trace infrastructure and the culture grew up using that. Hard to say.

#Question #Help

Dear #Lazyverse: What is the right #systemd #nspawn config file to run #bpftrace in the container?

I don't even get /sys/kernel/debug — it seems to be bind mounted, but appears empty in the container 😞

PrivateUsers=false is not sufficient.

It's all #Debian 11 bullseye stable, both host and container.

TIA!

Next up in our #EverythingOpen Speaker Spotlight series, we have Trent Lloyd, @lathiat who will introduce #bpftrace - which combines in-#kernel data collection and userspace analysis for #incident analysis.

#SRE #linux

https://2023.everythingopen.au/schedule/presentation/51/

I had to compile bpftrace from source but at least it's working! It's tracing all bash input at the moment. Very fun. Looking forward to finishing Liz Rice's report #ebpf #bpftrace

Interesting article about #kernel #livepatch and #bpftrace: https://www.bytelab.codes/using-modern-tooling-to-find-a-tough-linux-kernel-bug/

Pleasantly surprised by "BPF Performance Tools" by Brendan Gregg: It's already changed how I'm thinking about debugging and profiling across my system.

I guess I should have listened to all those folks telling me to learn #DTrace and #bpftrace for so long.

If you're exploring #BPF and you haven't seen Brendan Gregg's BPF Internals video on Youtube, it is a half hour well spent. I appreciate his concise and easy to understand style of teaching. (June 2021) https://youtu.be/_5Z2AU7QTH4
#bpftrace #ebpf #bpf I see he has a couple books on the topic as well (on the Oreilly shelf)
BPF performance tools (2019) &
System performance 2nd ed (2020)

@lattera Could #bpftrace be an acceptable replacement? (I don't know #dtrace and have only limited experience with bpftrace)

https://www.brendangregg.com/blog/2018-10-08/dtrace-for-linux-2018.html

Spent today digging deep into #linux policy routing, #nftables, and connection tracking. Came up with something that seems to work but it took a while to get there. Also learned a bunch about #ebpf and #bpftrace and spent too much time spelunking through https://elixir.bootlin.com.