Omar Sandoval (@[email protected])

Open source hacker @Meta. Linux kernel developer and creator of the drgn debugger.

[Omar Sandoval (@[email protected]) @omsandov]

The recording of my drgn talk at @KernelRecipes was uploaded: https://t.co/HBRTihNH8H. The bulk of the talk is a demo of debugging a real kernel bug, so check it out if you like learning by example! Thanks again to #kr2022 for having me!

[Omar Sandoval (@[email protected]) @omsandov]

The Linux Kernel Debugging Tools monthly meeting is this Wednesday, January 25th at 11:30 AM Pacific time. See the linux-debuggers mailing list for the agenda: https://t.co/B4tBJhQ0O3 and let me know if you'd like an invite.

[Omar Sandoval (@[email protected]) @omsandov]

drgn 0.0.22 is out now! Stephen Brennan contributed my favorite new feature: a method for listing all of the local variables in a stack frame. There are also new helpers for slab and XArrays, plus partial s390x support. See https://t.co/E8jwdQRSqK for the rest of the highlights.

[David Vernet @byte_lab]

The main focus of my time for the last 8-9 months was sent to vger this morning: https://t.co/41LgpPEtTb

I'm super excited about the possibility of implementing scheduling policies with BPF. Very grateful to Tejun for leading the effort and allowing me to tag along for the ride.

[Omar Sandoval (@[email protected]) @omsandov]

Who's still using Python 3.6? I really want to drop 3.6 support for drgn (https://t.co/7AotzSyXit is the latest reason), but I suspect that wouldn't be nice for those using enterprise Linux distros

[Omar Sandoval (@[email protected]) @omsandov]

Announcing drgn/contrib/, an easy place to share drgn scripts! If you have a useful script but you don't have time to turn it into a proper helper/tool, open a pull request there. See https://t.co/3aFvqkJuTi

[Omar Sandoval (@[email protected]) @omsandov]

@ericlippert I'm sorry to hear this. I still remember you giving an impromptu lesson of how futures/async are implemented to our bootcamp class, and I was impressed by you both technically and as a person. Best of luck to you and your team members.

[Omar Sandoval (@[email protected]) @omsandov]

I'm on Mastodon now as @[email protected]! Feel free to follow me there, too.

[Omar Sandoval (@[email protected]) @omsandov]

@pdp7 @axboe @fosstodon @lwnnet @KernelRecipes I'm currently struggling with this... The "explore" page for https://t.co/1drOicJxkG shows up empty for me, is that because it's overloaded?

[Omar Sandoval (@[email protected]) @omsandov]

@strudlzrout @gnutools Bummer about the standard auto shadowing behavior. The GCC __auto_type behavior is useful for macros.

[Omar Sandoval (@[email protected]) @omsandov]

@__dxu Search for "dumpable" in man 5 proc. https://t.co/aj4d2n8YTU

[Omar Sandoval (@[email protected]) @omsandov]

Huge thanks to @michel_slm for packaging drgn for Debian!

[Andrii Nakryiko @anakryiko]

New blog post introducing and demoing retsnoop, a powerful and ergonomic tool for debugging confusing kernel errors and learning kernel internals through tracing. https://t.co/MLeggqXb1X #linux #tracing

[Omar Sandoval (@[email protected]) @omsandov]

@__dxu Lol, I spent a couple of minutes thinking of how I could obfuscate it enough to do that

[Omar Sandoval (@[email protected]) @omsandov]

drgn 0.0.21 is out now! This release adds a bunch of new helpers (especially for memory management) and fixes some important bugs. See the release notes here: https://t.co/PZYe1XkQnA.

[Abandoned account of Thorsten Leemhuis (1/5) @kernellogger]

Quite a few nice performance improvements in the main #btrfs merge for #Linux #kernel 6.1: https://t.co/4zXeylTZuX

"[…] support io_uring and buffered writes […] leads to speed improvement in IOPS (2x), throughput (2.2x), latency (depends, 2x to 150x) […]"

[Meta Open Source @MetaOpenSource]

Software Engineer Martin Lau’s responsibilities range from reviewing patches in the mailing list to lowering service start-up time (down to six seconds). Learn how Martin’s contributions to the #Linux Kernel Team are helping production scale at Meta: https://t.co/rwKDkoL0gf

[Meta Open Source @MetaOpenSource]

Signals make up the plumbing in Unix-like operating environments, but they come with a significant number of pitfalls as a project grows. Learn about some of the alternative methods and mitigations to use from @unixchris: https://t.co/rRvLDbGDvR

[Meta Open Source @MetaOpenSource]

David Vernet is a core systems engineer on the Kernel team at Meta working on the BPF and #Linux kernel scheduler. Learn what his typical day looks like and what he enjoys most about his job at Meta: https://t.co/sxRxCDgvTs

[Omar Sandoval (@[email protected]) @omsandov]

@olofj Nice, that's a pretty cool use case. What distro are you using in the container? Or is it a hand-rolled build?

[Omar Sandoval (@[email protected]) @omsandov]

Has ILP32 ever taken off? From what I can tell, x32 is basically dead, but I remember there was something similar in the works for ARM64.