Hackers' Pub

Syntax	Description	Examples
`"` keyword `"`	Finds the string within quotes, including spaces. Case-insensitive. (Escape quotes inside with `\"`)	`"Hackers' Pub"`
`from:` handle	Finds content written by the specified user.	`from:hongminhee` `from:hongminhee@hollo.social`
`lang:` ISO 639-1	Finds content written in the specified language.	`lang:en`
`#` tag	Finds content with the specified tag. Case-insensitive.	`#HackersPub`
condition condition	Finds content that satisfies both conditions on either side of the space (logical AND).	`"Hackers' Pub" lang:en`
condition `OR` condition	Finds content that satisfies at least one of the conditions on either side of the OR operator (logical OR).	`#HackersPub OR "Hackers' Pub" lang:en`
`(` condition `)`	Combines the operators within the parentheses first.	`(#HackersPub OR "Hackers' Pub" OR "Hackers Pub") lang:en`

mei @mei@donotsta.re

1/26/2026, 6:50:30 PM

Public

"gee it would be nice if i could see every time a given kernel function gets called... too bad i'd have to recompile the kernel and reboot to insert a print"

well guess what. you don't need to, because ftrace exists, and it can do that and also a bunch of other stuff.

it apparently existed since 2008

i just watched a 15 minute demo of what it can do and... wait, why didn't i know about this sooner? https://www.brendangregg.com/blog/2016-12-27/linux-tracing-in-15-minutes.html

Give me 15 minutes and I'll change your view of Linux tracing

Give me 15 minutes and I'll change your view of Linux tracing: a quick tour of ftrace, perf, and enhanced BPF (eBPF).

www.brendangregg.com

If you have a fediverse account, you can quote this note from your own instance. Search https://donotsta.re/objects/1418456a-7dca-4550-8642-7a0f30fb99bd on your instance and quote it. (Note that quoting is not supported in Mastodon.)