Notices by Ivan Molodetskikh (yalter@mastodon.online), page 5

@lanodan oh don't worry, that happens plenty often also 🙃

I swear, every single time I'm preparing release notes for one of my projects I randomly stumble upon a completely unrelated bug that's been sitting there unnoticed for months. It just happened again with niri 0.1.4, I hit a timing based crash in the screencast code that must've been there from the beginning. I'm actually glad because it means I can fix it right away, but how does this keep happening lol

Wow nice one Discord, capping the password length at 72 characters in an update. So now I cannot log into my accounts...

Added quite a number of things into the compositor since then. It's at the point where I can somewhat-comfortably use it for working or (Wayland-only) gaming sessions.

Today I figured out how to make it run as a proper session, launched from GDM, with systemd integration and all. It even mostly works!

Also finally implemented the ability to take screenshots—this one is from a real session.

Kinda want to try my hand at the screencast portal for OBS. How hard can it be, right? 🙃

Decided to try writing a Wayland compositor for fun. Took me a few days to get things going to a video-able state.

This is scrollable tiling, heavily inspired by PaperWM (which I'm still using and very much enjoying). You've got an infinite strip of windows that you can scroll through.

It's also got dynamic workspaces which work like in GNOME Shell (the Correct™ way to do workspaces), but all monitors have workspaces.

The repo is https://github.com/YaLTeR/niri if you want to peek at the code

After adding dmabuf feedbacks to niri, I stumbled upon an extremely strange performance problem when using overlay planes. One specific animation, with a GTK 4 window open, stutters, but only when going into one direction.

Spent half a day debugging it with Smithay developers. Couldn't crack it yet; for some reason an AMDGPU kernel worker just... takes a while under those specific conditions, causing delayed frames. Seems to be doing the same thing as in the normal case, just... slower somehow.

Almost done adding touchpad gesture support to Smithay!

Here you can see the pinch zoom/rotate gesture visually in gtk4-demo, then the swipe gesture only in WAYLAND_DEBUG on the right, then the hold gesture by stopping the kinetic scrolling by putting a finger on the touchpad.

Aaand my touchpad gesture support has been merged into Smithay! :ablobcatbongo:

I'm quite enjoying playing with the Tracy profiler. Turns out when you run the program with sudo, it records a ton of extra useful info, like CPU core scheduling, monitor VSync events, kernel context switches, what your process is blocked on.

I also annotated my compositor with Tracy Frame events for monitor VBlank cycles. I can then set a target FPS in Tracy and instantly see which frames were too slow! Both in the bar at the top, and in the main area highlighted in red.

I just streamed for an hour from this and nothing crashed??

aaaaaaaaahhhhhhhhhhh these two days were a grind but I somehow got monitor streaming working! with pipewire and dmabufs and dbus and screencast portal and everything! and it wooorkssssssssss woooooooooooooo

lol a few days ago someone posted niri on the orange site and now it surpassed all my other projects by star count 🫠

Today in Wayland compositor profiling! Turns out closing a shm pool file descriptor can result in a fat stall of up to like 6 ms with the kernel waiting on some spinlocks. Which is extra fun when you realize it covers the entire frame budget of your 165 Hz screen, and some clients are sometimes doing it every frame!

I'm trying a "dropping thread" workaround where the fd closing happens on a separate thread. Appears to work at the first glance.

Dmabuf screencasting is crazy good. Here's a histogram of the screencasting overhead on my 2560×1600@165 screen—the median is 300 microseconds, and the worst across 12,669 frames was just below 1 ms. Most of that time is spent rendering the frame, perhaps something could even be further optimized in Smithay.

And yeah, if you look at the profiling timeline, I zoomed it in such a way that almost the entire width is taken by one frame, that is 6.05 ms long. Most of it is completely empty!

new main loop stall dropped

and it is, uhhhhh, epoll_wait doing blocking disk decryption for solid 8 ms? is that a thing that it does?

seems to have happened once over a long period but still

Thought of another thing to plot in Tracy: target presentation time offset! This is the difference between when a frame was shown on screen and the target time that we were rendering for.

Here you can see data across 17 seconds of runtime while recording with OBS. Offset on both monitors fluctuates within a few microseconds around zero, which means that our rendering lands right on time.

Aside from this and some other weirdness, not a single dropped frame on my slower laptop! (which is admittedly just 60 Hz)

Found the same disc decryption during rendering. Does it just randomly decide to do it or something?

niri development is ongoing, getting a lot of help from kchibisov too.

Today I implemented an interactive area screenshot capture tool. Almost like a mini screenshot UI :ablobcatbongo:

I'm still working on niri btw (and using it myself too). Today I finally finished a window layout refactor that was due from very early on.

Now the layout always works correctly, with all the paddings, struts, fullscreen windows and animations. It's tricky because while most of the logic operates only on the "working area" (view excluding struts), fullscreen windows in particular must cover the entire view area, while otherwise acting as just another regular window column.