samuela

Niri layer-surface DMA-BUF leak — matched A/B reproducer, measurements & plot

This gist contains the harness, raw data, and plot for a matched A/B measurement of the Niri compositor memory leak fixed by niri-wm/niri#4485 (issue #1457): when an output is removed before a layer-shell client destroys its per-output layer surface, Niri retains the stale MappedLayer and its imported DMA-BUF indefinitely. On real hardware this accumulates ~84 MiB of GPU-backed shared memory per output off/on cycle for a full shell (~39 MiB for a minimal Quickshell layer) — a 16-day session with 138 HDMI reconnect cycles had accumulated ~12 GiB; see the

samuela

[nixbuild.net] Build 7086740 queued at 26-03-04 14:34:44Z. Allocated 36 CPUs, 133.4 GB memory.
Running phase: unpackPhase
unpacking source archive /nix/store/s3nx31pxs73fplsicjh1zsznkw4asmfg-source
source root is source
Running phase: patchPhase
patching script interpreter paths in .
./.kokoro/generate_index_html.sh: interpreter directive changed from "#!/bin/bash" to "/nix/store/kysqfpylfpl8yrmgahj1sk6yrih918gl-bash-5.3p9/bin/bash"
./build_tools/ci/build.py: interpreter directive changed from "#!/usr/bin/python3" to "/nix/store/sgwyk49anisz13i8j8gn7nxk0d9daf7j-python3-3.13.12-env/bin/python3"
./build_tools/ci/parallel_gpu_execute.sh: interpreter directive changed from "#!/usr/bin/env bash" to "/nix/store/kysqfpylfpl8yrmgahj1sk6yrih918gl-bash-5.3p9/bin/bash"
./build_tools/configure/configure.py: interpreter directive changed from "#!/usr/bin/env python3" to "/nix/store/sgwyk49anisz13i8j8gn7nxk0d9daf7j-python3-3.13.12-env/bin/python3"

samuela

Elements of skainswo Style

Note

This document has been migrated to my blog at samlikes.pizza/blog/elements-of-skainswo-style. Future updates will be made there.

---

In the course of my open source and day-to-day work I am occasionally asked to weigh in on software design. In the interest of my time and energy and the time and energy of others, this document is an attempt to codify as much as possible of my personal design philosophy and programming aesthetics. It is my goal that after reading this document and all of the linked material you will have a faithful mental model of how I think about the world and programming in particular -- hopefully to the extent that you could imitate me in a PR review or design discussion, whether or not you agree.

| ![i know kung fu](https://media4.giphy.com/media/v1.Y2lkPTZjMDliOTUyZXZzeWdyamY5aDJmMmEzd3ViNGZ6dXpia2IyYXY3MzQzMXZ5N3JoZyZlcD12MV9naWZzX3NlYXJjaC

samuela

❯ nix-build -A python3Packages.anndata
this derivation will be built:
  /nix/store/swwnk1mhz2wfxy75asx67zjg2qkhi8di-python3.12-anndata-0.11.4.drv
building '/nix/store/swwnk1mhz2wfxy75asx67zjg2qkhi8di-python3.12-anndata-0.11.4.drv'...
Sourcing python-remove-tests-dir-hook
Sourcing python-catch-conflicts-hook.sh
Sourcing python-remove-bin-bytecode-hook.sh
Sourcing pypa-build-hook
Using pypaBuildPhase
Sourcing python-runtime-deps-check-hook

samuela

nixpkgs on  samuela/scanpy
❯ nix-build -A python3Packages.anndata
this derivation will be built:
  /nix/store/kgligwzymlzjy7wvlb9jc9wv0wl3i198-python3.12-anndata-0.11.4.drv
building '/nix/store/kgligwzymlzjy7wvlb9jc9wv0wl3i198-python3.12-anndata-0.11.4.drv'...
Sourcing python-remove-tests-dir-hook
Sourcing python-catch-conflicts-hook.sh
Sourcing python-remove-bin-bytecode-hook.sh
Sourcing pypa-build-hook

samuela

// This config is in the KDL format: https://kdl.dev
// "/-" comments out the following node.
// Check the wiki for a full description of the configuration:
// https://github.com/YaLTeR/niri/wiki/Configuration:-Overview

// See https://github.com/YaLTeR/niri/wiki/Application-Issues#electron-applications
environment {
    ELECTRON_OZONE_PLATFORM_HINT "auto"
}

samuela

// This config is in the KDL format: https://kdl.dev
// "/-" comments out the following node.
// Check the wiki for a full description of the configuration:
// https://github.com/YaLTeR/niri/wiki/Configuration:-Overview

// See https://github.com/YaLTeR/niri/wiki/Application-Issues#electron-applications
environment {
    ELECTRON_OZONE_PLATFORM_HINT "auto"
}

samuela

  nixpkgs on  master on ☁️  
󰂃 10% ❯ nix-build -E 'with import <nixpkgs> {}; bazel_7.override { enableNixHacks = true; }'
this derivation will be built:
  /nix/store/abzdw0gb1lz10w5rc97y88l3glpfxy0y-bazel-7.4.1.drv
building '/nix/store/abzdw0gb1lz10w5rc97y88l3glpfxy0y-bazel-7.4.1.drv'...
Running phase: unpackPhase
unpacking source archive /nix/store/9dh7hw9x3jw35s0xjb2zinlkh3ckr0yw-bazel-7.4.1-dist.zip
source root is .
Running phase: patchPhase
applying patch /nix/store/bak52cz0p06vsjd6wn0v3k7d8r822nca-java_toolchain.patch

samuela

{
  "nodes": {
    "naersk": {
      "inputs": {
        "nixpkgs": "nixpkgs"
      },
      "locked": {
        "lastModified": 1698420672,
        "narHash": "sha256-/TdeHMPRjjdJub7p7+w55vyABrsJlt5QkznPYy55vKA=",
        "owner": "nix-community",

samuela

{
  "nodes": {
    "nixpkgs": {
      "locked": {
        "lastModified": 1711624657,
        "narHash": "sha256-IViG6BKCJY/I6oRNfAANf/QitYylepQSCzgam0TF+bs=",
        "owner": "NixOS",
        "repo": "nixpkgs",
        "rev": "72c6ed328aa4e5d9151b1a512f6ad83aca7529fa",
        "type": "github"