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Does it still completely screw up file/group owners in user containers? Because they keep saying it gets fixed and then that 1 out of 10 times it's not.

> I found it hard to believe we couldn’t get a wakeup timer more granular than 1 ms, so I looked at what KWin was using. Indeed, it was passing the sleep duration in milliseconds t…

This feature (fibers in systemd) was also modeled after libdex (which I wrote for GNOME).

I've been doing this with something very similar in GNOME for years now. It also does io_uring, threadpool schedulers, workstealing, "pollable semaphores" (like IRIX), profiler int…

The good news is that before writing Ptyxis, I also ported GNOME Terminal to GTK 4 and doubled the performance of VTE. So you know, use whatever you like.

Almost all of that is Mesa shaders and GTK's CPU side font-cache for GL/Vulkan, compiled CSS state, FWIW. If you run: GSK_RENDERER=cairo ptyxis -s You can verify that with 69,985 h…

In most cases you're already using signalfd in places where libdex runs.

> I'm not normally keen to "well actually" people with the C standard, but .. if you're writing in assembly, you're not writing in C. These days on Linux/BSD/Solaris/macOS you can …

In X11 we kept things simple by offering: * Core protocol drawing (lines, rectangles, arcs, the classics) * XRender for compositing and alpha * XShm for shared-memory blits * GLX i…

So the state of 2025 then tests a VTE that is from 2023? 4 major releases behind? And through a GTK 3 app, not even a GTK 4 one which will use the GPU?

Red Hat announced RISC-V yesterday with RHEL 10. So this seems rather expected. https://www.redhat.com/en/blog/red-hat-partners-with-sifive-...

As someone who went down this path many years ago, I think the GTK numbers in the article are a bit misleading. You wouldn't create 1000 buttons to do a flamegraph properly in GTK.…

https://pagure.io/fesco/issue/2817#comment-826636 will probably get you started into the relevant paths. Python 3.12 was going to include frame-pointers anyway for perf to boot. So…

This is a bit of a mischaracterization of the Python side of things. They only opted out for 3.11 which did not yet have the perf-integration fixes anyway. 3.12 uses frame-pointers…

I think your viewpoint is valid. My experience is on performance tuning the other side you mention. Cross-application, cross-library, whole-system, daemons, etc. Basically, "the wh…

It's a disaster no doubt. But, at least from the GNOME side of things, we've been complaining about it for roughly 15 years and kept getting push-back in the form of "we'll make so…

Absolutely. We've gotten numerous double digit performance improvements across applications, libraries, and system daemons because of frame-pointers in Fedora (and that's just from…

I regularly have users run Sysprof and upload it to issues. It's immensely powerful to be able to see what is going on systems which are having issues. I'd argue it's one of the ma…

> Shadow stacks are cool but aren't they limited to a fixed number of entries? Current available hardware yes. But I think some of the future Intel stuff was going to allow for muc…

It does cause more memory pressure because the kernel will have to look at the user-space memory for decoding registers. So yes it will be faster than alternatives to frame-pointer…

I added support to Sysprof this weekend for unwinding using libdwfl and DWARF/CFI/eh_frame/etc techniques that Serhei did in eu-stacktrace. The overhead is about 10% of samples. Bu…

These are two common things I ask new friends so that I can communicate better with them (aphantasia and inner monologue).

Nothing, I have aphantasia.

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