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Jeff Muizelaar jrmuizel

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jrmuizel / mallocwrap.c
Created October 17, 2025 15:03
Hook malloc
// profiling_zone.c
#include <malloc/malloc.h>
#include <dlfcn.h>
#include <stdlib.h>
#include <unistd.h>
// Profiling callback function pointers
static void (*profiling_alloc_callback)(void* ptr, size_t reserved_size, size_t used_size) = NULL;
static void (*profiling_free_callback)(void* ptr, size_t reserved_size, size_t used_size) = NULL;
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jrmuizel / trr channel annotation
Last active October 15, 2025 15:35
commit d38a61ab87acab9c1e379cfe952082c22da08d55
Author: Jeff Muizelaar <jmuizelaar@mozilla.com>
Date: Fri Nov 15 09:57:49 2024 +0100
trr channel annotation
diff --git a/netwerk/protocol/http/TRRServiceChannel.cpp b/netwerk/protocol/http/TRRServiceChannel.cpp
index 85e6d299e869f..dd4335149aa2e 100644
--- a/netwerk/protocol/http/TRRServiceChannel.cpp
+++ b/netwerk/protocol/http/TRRServiceChannel.cpp
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jrmuizel / gist:c2bc7710ccb050758b47b876c6096c9c
Created October 15, 2025 15:23
commit fbaacca0ea987d5e231f5dc05fd11d222bfdf2b0
Author: Jeff Muizelaar <jmuizelaar@mozilla.com>
Date: Wed Nov 6 23:19:11 2024 -0500
Socket markers
diff --git a/netwerk/base/nsSocketTransport2.cpp b/netwerk/base/nsSocketTransport2.cpp
index 8952bbebd9f9a..e800018820091 100644
--- a/netwerk/base/nsSocketTransport2.cpp
+++ b/netwerk/base/nsSocketTransport2.cpp
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jrmuizel / gist:cc9d8d48fb79893f39b86f1488afdff2
Last active May 23, 2025 12:40
iOS browser market share
{
"success": true,
"errors": [],
"result": {
"main": {
"timestamps": [
"2025-03-10T00:00:00Z",
"2025-03-17T00:00:00Z",
"2025-03-24T00:00:00Z",
"2025-03-31T00:00:00Z",
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jrmuizel / rust-flows.patch
Created May 5, 2025 14:37
commit 815f5a4bd71cdd73dad134125dde89c8e6ec45bd
Author: Jeff Muizelaar <jmuizelaar@mozilla.com>
Date: Fri Nov 15 10:38:17 2024 +0100
Rust flow
diff --git a/netwerk/protocol/http/nsHttpTransaction.cpp b/netwerk/protocol/http/nsHttpTransaction.cpp
index e6bba66b6fff9..ee6fc53401720 100644
--- a/netwerk/protocol/http/nsHttpTransaction.cpp
+++ b/netwerk/protocol/http/nsHttpTransaction.cpp
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jrmuizel / JsonWriter.java
Created May 3, 2025 01:31
Stream string values
class StringWriter extends Writer {
public StringWriter(Writer out) {
this.out = out;
}
@Override
public void write(char[] cbuf, int off, int len) throws IOException {
for (int i = 0; i < len; i++) {
char c = cbuf[i + off];
/*
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jrmuizel / profile.py
Created April 30, 2025 15:13
import subprocess
import os
tests_with_workers = ["Air", "Basic", "ML", "Babylon", "cdjs",
"first-inspector-code-load", "multi-inspector-code-load",
"Box2D", "octane-code-load", "crypto", "delta-blue",
"earley-boyer", "gbemu", "mandreel", "navier-stokes",
"pdfjs", "raytrace", "regexp", "richards", "splay",
"typescript", "octane-zlib", "FlightPlanner", "OfflineAssembler",
"UniPoker", "async-fs", "float-mm.c", "hash-map",
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jrmuizel / gist:d8ff86d67e478c1ad7706f1679497fde
Created April 4, 2025 02:50
This file has been truncated, but you can view the full file.
./dist/bin/libxul.so: file format elf64-little
SYMBOL TABLE:
000000000886a8d0 l .data.rel.ro 0000000000000000 $d.2
000000000886a8d0 l O .data.rel.ro 0000000000000008 .hidden __dso_handle
000000000886a8d8 l .data.rel.ro 0000000000000000 $d
000000000886aa40 l .data.rel.ro 0000000000000000 $d
000000000886b540 l .data.rel.ro 0000000000000000 $d
000000000886b610 l .data.rel.ro 0000000000000000 $d
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jrmuizel / vt.html
Created February 19, 2025 19:33
<!doctype html>
<style>
.child {
position: absolute;
left: 10px;
width: 50px;
height: 50px;
background: lightblue;
border: 1px solid black;
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jrmuizel / profiling-python-with-perf.md
Last active November 14, 2025 20:53
Profiling python with perf

Get a Python that has frame pointers enabled

CFLAGS="-fno-omit-frame-pointer -mno-omit-leaf-frame-pointer" pyenv install 3.13

pyenv shell 3.13

Run python with perf support turned on