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fune/browser/base/content/test/performance/browser_startup_mainthreadio.js
Gijs Kruitbosch ea58459bc1 Bug 1545123 - move reading pluginreg and scanning for plugins to a background thread, r=handyman,mconley 
Finally, let's move the actual IO away from the main thread.

This means there are now 3 ways of looking for plugins:
1. looking for changes from ReloadPlugins. This runs the PluginFinder runnable
   on the main thread.
2. loading plugins from LoadPlugins. This will:
   a) first check prefs and report the flash plugin based on that information,
      if the prefs indicate it exists (using the callback provided by
      nsPluginHost).
   b) then hopefully dispatch to a background thread, where it will read
      pluginreg.dat, scan the appropriate folders on disk, and see if
      anything changed. Once done, it sets mFinishedFinding to true and
      re-dispatches itself to the main thread.
   c) then on the main thread, it reports any changes to nsPluginHost.
3. if dispatching in 2(b) fails, we will run steps (b) and (c) on the main
   thread.

Note: if ReloadPlugins is called, we intiially do (1), but if we find
changes, we clear out the set of known plugins and then run LoadPlugins
again (meaning we go through 2 (or 3 if 2(b) fails)). This is how
reloading plugins worked prior to my changes and I've attempted not to
change it.

In order for this to work, there are some other changes in this commit:

- the sandbox prefs are being read "early" and cached for flash vs
  "everything else". We can't access prefs on non-main threads without
  using StaticPrefs, which doesn't seem worth it here.
- some of the plugin tag classes are moved to threadsafe refcounting.
  This is a bit unfortunate, but because they're instantiated on a non-
  mainthread, and then later used on the main thread, despite the
  fact that the architecture means nothing tries to touch them from
  more than one thread at once, without threadsafe refcounting we hit
  asserts in debug mode if we add references to them back on the main thread.
- we add shutdown blocking for pluginfinding. We don't really want to
  be halfway through finding plugins and then trying to shut them down,
  or re-instantiating plugins after they've been unloaded.
- we keep a reference to the "pending" pluginfinder instance while
  doing lookups away from the main thread (ie (2)), to avoid re-entrancy or
  trying to write to pluginreg while we're reading it somewhere else,
  etc. If there's an attempt to do more plugin finding while this is
  ongoing, we flip mDoReloadOnceFindingFinished and do a reload once
  our initial lookups are complete.

Depends on D48331

Differential Revision: https://phabricator.services.mozilla.com/D48332

--HG--
extra : moz-landing-system : lando
2019-11-02 22:35:04 +00:00

926 lines
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/* Any copyright is dedicated to the Public Domain.
http://creativecommons.org/publicdomain/zero/1.0/ */
/* This test records I/O syscalls done on the main thread during startup.
*
* To run this test similar to try server, you need to run:
* ./mach package
* ./mach test --appname=dist <path to test>
*
* If you made changes that cause this test to fail, it's likely because you
* are touching more files or directories during startup.
* Most code has no reason to use main thread I/O.
* If for some reason accessing the file system on the main thread is currently
* unavoidable, consider defering the I/O as long as you can, ideally after
* the end of startup.
* If your code isn't strictly required to show the first browser window,
* it shouldn't be loaded before we are done with first paint.
* Finally, if your code isn't really needed during startup, it should not be
* loaded before we have started handling user events.
*/
"use strict";
const { AddonManager } = ChromeUtils.import(
"resource://gre/modules/AddonManager.jsm"
);
/* Set this to true only for debugging purpose; it makes the output noisy. */
const kDumpAllStacks = false;
// Shortcuts for conditions.
const LINUX = AppConstants.platform == "linux";
const WIN = AppConstants.platform == "win";
const MAC = AppConstants.platform == "macosx";
/* Paths in the whitelist can:
* - be a full path, eg. "/etc/mime.types"
* - have a prefix which will be resolved using Services.dirsvc
* eg. "GreD:omni.ja"
* It's possible to have only a prefix, in thise case the directory will
* still be resolved, eg. "UAppData:"
* - use * at the begining and/or end as a wildcard
* - For Windows specific entries that require resolving the path to its
* canonical form, ie. the old DOS 8.3 format, use canonicalize: true.
* This is needed for stat calls to non-existent files.
* The folder separator is '/' even for Windows paths, where it'll be
* automatically converted to '\'.
*
* Specifying 'ignoreIfUnused: true' will make the test ignore unused entries;
* without this the test is strict and will fail if a whitelist entry isn't used.
*
* Each entry specifies the maximum number of times an operation is expected to
* occur.
* The operations currently reported by the I/O interposer are:
* create/open: only supported on Windows currently. The test currently
* ignores these markers to have a shorter initial whitelist.
* Adding Unix support is bug 1533779.
* stat: supported on all platforms when checking the last modified date or
* file size. Supported only on Windows when checking if a file exists;
* fixing this inconsistency is bug 1536109.
* read: supported on all platforms, but unix platforms will only report read
* calls going through NSPR.
* write: supported on all platforms, but Linux will only report write calls
* going through NSPR.
* close: supported only on Unix, and only for close calls going through NSPR.
* Adding Windows support is bug 1524574.
* fsync: supported only on Windows.
*
* If an entry specifies more than one operation, if at least one of them is
* encountered, the test won't report a failure for the entry. This helps when
* whitelisting cases where the reported operations aren't the same on all
* platforms due to the I/O interposer inconsistencies across platforms
* documented above.
*/
const startupPhases = {
// Anything done before or during app-startup must have a compelling reason
// to run before we have even selected the user profile.
"before profile selection": [
{
// bug 1541200
path: "UAppData:Crash Reports/InstallTime20*",
condition: AppConstants.MOZ_CRASHREPORTER,
stat: 1, // only caught on Windows.
read: 1,
write: 2,
close: 1,
},
{
// bug 1541200
path: "UAppData:Crash Reports/LastCrash",
condition: WIN && AppConstants.MOZ_CRASHREPORTER,
stat: 1, // only caught on Windows.
read: 1,
},
{
// bug 1541200
path: "UAppData:Crash Reports/LastCrash",
condition: !WIN && AppConstants.MOZ_CRASHREPORTER,
ignoreIfUnused: true, // only if we ever crashed on this machine
read: 1,
close: 1,
},
{
// At least the read seems unavoidable for a regular startup.
path: "UAppData:profiles.ini",
ignoreIfUnused: true,
condition: MAC,
stat: 1,
read: 1,
close: 1,
},
{
// At least the read seems unavoidable for a regular startup.
path: "UAppData:profiles.ini",
condition: WIN,
ignoreIfUnused: true, // only if a real profile exists on the system.
read: 1,
stat: 1,
},
{
// bug 1541226, bug 1363586, bug 1541593
path: "ProfD:",
condition: WIN,
stat: 1,
},
{
path: "ProfLD:.startup-incomplete",
condition: !WIN, // Visible on Windows with an open marker
close: 1,
},
{
// bug 1541491 to stop using this file, bug 1541494 to write correctly.
path: "ProfLD:compatibility.ini",
condition: !WIN, // Visible on Windows with an open marker
write: 18,
close: 1,
},
{
path: "GreD:omni.ja",
condition: !WIN, // Visible on Windows with an open marker
stat: 1,
},
{
// bug 1376994
path: "XCurProcD:omni.ja",
condition: !WIN, // Visible on Windows with an open marker
stat: 1,
},
{
path: "ProfD:parent.lock",
condition: WIN,
stat: 1,
},
{
// bug 1541603
path: "ProfD:minidumps",
condition: WIN,
stat: 1,
},
{
// bug 1543746
path: "XCurProcD:defaults/preferences",
condition: WIN,
stat: 1,
},
{
// bug 1544034
path: "ProfLDS:startupCache/scriptCache-child-current.bin",
condition: WIN,
stat: 1,
},
{
// bug 1544034
path: "ProfLDS:startupCache/scriptCache-child.bin",
condition: WIN,
stat: 1,
},
{
// bug 1544034
path: "ProfLDS:startupCache/scriptCache-current.bin",
condition: WIN,
stat: 1,
},
{
// bug 1544034
path: "ProfLDS:startupCache/scriptCache.bin",
condition: WIN,
stat: 1,
},
{
// bug 1541601
path: "PrfDef:channel-prefs.js",
stat: 1,
read: 1,
close: 1,
},
{
// At least the read seems unavoidable
path: "PrefD:prefs.js",
stat: 1,
read: 1,
close: 1,
},
{
// bug 1543752
path: "PrefD:user.js",
stat: 1,
read: 1,
close: 1,
},
{
path: "*ld.so.conf*",
condition: LINUX,
ignoreIfUnused: true,
read: 22,
close: 11,
},
{
// bug 1546838
path: "ProfD:xulstore/data.mdb",
condition: WIN,
write: 1,
fsync: 1,
},
],
"before opening first browser window": [
{
// bug 1541226
path: "ProfD:",
condition: WIN,
stat: 1,
},
{
path: "XCurProcD:blocklist.xml",
condition: WIN,
stat: 1,
},
{
// bug 1534745
path: "ProfD:cookies.sqlite-journal",
condition: !LINUX,
stat: 3,
write: 4,
},
{
// bug 1534745
path: "ProfD:cookies.sqlite",
condition: !LINUX,
stat: 2,
read: 2,
write: 1,
},
{
// bug 1534745
path: "ProfD:cookies.sqlite-wal",
condition: WIN,
stat: 2,
},
{
// bug 975996
path: "ProfD:permissions.sqlite",
condition: WIN || MAC,
fsync: 7,
read: 2,
stat: 1,
write: 10,
},
{
// bug 975996
path: "ProfD:permissions.sqlite-journal",
condition: WIN || MAC,
fsync: 7,
stat: 26,
write: 38,
},
{
// bug 975996
path: "ProfD:permissions.sqlite-wal",
condition: WIN,
stat: 20,
},
{
// Seems done by OS X and outside of our control.
path: "*.savedState/restorecount.plist",
condition: MAC,
ignoreIfUnused: true,
write: 1,
},
{
path: "*ld.so.conf*",
condition: LINUX,
ignoreIfUnused: true,
read: 22,
close: 11,
},
{
// bug 1545167
path: "/etc/mime.types",
condition: LINUX,
read: 3,
close: 3,
},
{
// bug 1541246
path: "ProfD:extensions",
condition: WIN,
stat: 1,
},
{
// bug 1541246
path: "XCurProcD:extensions",
condition: WIN,
stat: 1,
},
{
// bug 1541246
path: "UAppData:",
ignoreIfUnused: true, // sometimes before opening first browser window,
// sometimes before first paint
condition: WIN,
stat: 1,
},
{
// bug 1546838
path: "ProfD:xulstore/data.mdb",
condition: WIN,
read: 1,
},
],
// We reach this phase right after showing the first browser window.
// This means that any I/O at this point delayed first paint.
"before first paint": [
{
// bug 1545119
path: "OldUpdRootD:",
condition: WIN,
stat: 1,
},
{
// bug 1446012
path: "UpdRootD:updates/0/update.status",
condition: WIN,
stat: 1,
},
{
// bug 1586808
path: "UserPlugins.parent:",
condition: WIN,
stat: 1,
},
{
path: "XREAppFeat:formautofill@mozilla.org.xpi",
condition: !WIN,
stat: 1,
close: 1,
},
{
// We only hit this for new profiles.
path: "XREAppDist:distribution.ini",
condition: WIN,
stat: 1,
},
{
path: "*WindowsApps/microsoft.windowscommunicationsapps*",
condition: WIN,
ignoreIfUnused: true,
stat: 3,
},
{
// bug 1545139
path: "*Fonts/StaticCache.dat",
condition: WIN,
ignoreIfUnused: true, // Only on Win7
read: 1,
},
{
// bug 1541246
path: "UAppData:",
ignoreIfUnused: true, // sometimes before opening first browser window,
// sometimes before first paint
condition: WIN,
stat: 1,
},
{
// Not in packaged builds; useful for artifact builds.
path: "GreD:ScalarArtifactDefinitions.json",
condition: WIN && !AppConstants.MOZILLA_OFFICIAL,
stat: 1,
},
{
// Not in packaged builds; useful for artifact builds.
path: "GreD:EventArtifactDefinitions.json",
condition: WIN && !AppConstants.MOZILLA_OFFICIAL,
stat: 1,
},
{
// bug 1546838
path: "ProfD:xulstore/data.mdb",
condition: MAC,
write: 3,
},
],
// We are at this phase once we are ready to handle user events.
// Any IO at this phase or before gets in the way of the user
// interacting with the first browser window.
"before handling user events": [
{
path: "GreD:update.test",
ignoreIfUnused: true,
condition: LINUX,
close: 1,
},
{
// bug 1370516 - NSS should be initialized off main thread.
path: "ProfD:cert9.db",
condition: WIN,
read: 2,
stat: 2,
},
{
// bug 1370516 - NSS should be initialized off main thread.
path: "ProfD:cert9.db",
condition: WIN,
ignoreIfUnused: true, // if canonicalize(ProfD) == ProfD, we'll use the previous entry.
canonicalize: true,
stat: 2,
},
{
// bug 1370516 - NSS should be initialized off main thread.
path: "ProfD:cert9.db-journal",
condition: WIN,
canonicalize: true,
stat: 2,
},
{
// bug 1370516 - NSS should be initialized off main thread.
path: "ProfD:cert9.db-wal",
condition: WIN,
canonicalize: true,
stat: 2,
},
{
// bug 1370516 - NSS should be initialized off main thread.
path: "ProfD:pkcs11.txt",
condition: WIN,
read: 2,
},
{
// bug 1370516 - NSS should be initialized off main thread.
path: "ProfD:key4.db",
condition: WIN,
read: 2,
stat: 2,
},
{
// bug 1370516 - NSS should be initialized off main thread.
path: "ProfD:key4.db",
condition: WIN,
ignoreIfUnused: true, // if canonicalize(ProfD) == ProfD, we'll use the previous entry.
canonicalize: true,
stat: 2,
},
{
// bug 1370516 - NSS should be initialized off main thread.
path: "ProfD:key4.db-journal",
condition: WIN,
canonicalize: true,
stat: 5,
},
{
// bug 1370516 - NSS should be initialized off main thread.
path: "ProfD:key4.db-wal",
condition: WIN,
canonicalize: true,
stat: 5,
},
{
path: "XREAppFeat:webcompat-reporter@mozilla.org.xpi",
condition: !WIN,
ignoreIfUnused: true,
stat: 1,
close: 1,
},
{
path: "XCurProcD:extensions",
condition: WIN,
stat: 1,
},
],
// Things that are expected to be completely out of the startup path
// and loaded lazily when used for the first time by the user should
// be blacklisted here.
"before becoming idle": [
{
path: "XREAppFeat:screenshots@mozilla.org.xpi",
ignoreIfUnused: true,
close: 1,
},
{
path: "XREAppFeat:webcompat-reporter@mozilla.org.xpi",
ignoreIfUnused: true,
stat: 1,
close: 1,
},
{
// bug 1391590
path: "ProfD:places.sqlite-journal",
ignoreIfUnused: true,
fsync: 1,
stat: 4,
write: 2,
},
{
// bug 1391590
path: "ProfD:places.sqlite-wal",
ignoreIfUnused: true,
stat: 4,
fsync: 3,
write: 148,
},
{
// bug 1391590
path: "ProfD:places.sqlite-shm",
condition: WIN,
ignoreIfUnused: true,
stat: 1,
},
{
// bug 1391590
path: "ProfD:places.sqlite",
ignoreIfUnused: true,
fsync: 2,
read: 1,
stat: 3,
write: 1310,
},
{
// bug 1391590
path: "ProfD:favicons.sqlite-journal",
ignoreIfUnused: true,
fsync: 2,
stat: 7,
write: 7,
},
{
// bug 1391590
path: "ProfD:favicons.sqlite-wal",
ignoreIfUnused: true,
fsync: 2,
stat: 7,
write: 15,
},
{
// bug 1391590
path: "ProfD:favicons.sqlite-shm",
condition: WIN,
ignoreIfUnused: true,
stat: 2,
},
{
// bug 1391590
path: "ProfD:favicons.sqlite",
ignoreIfUnused: true,
fsync: 3,
read: 4,
stat: 4,
write: 1300,
},
{
path: "ProfD:key4.db-journal",
condition: WIN,
canonicalize: true,
stat: 2,
},
{
path: "ProfD:key4.db-wal",
condition: WIN,
canonicalize: true,
stat: 2,
},
{
path: "ProfD:",
condition: WIN,
ignoreIfUnused: true,
stat: 3,
},
],
};
for (let name of [
"d3d11layers",
"d3d9video",
"glcontext",
"d3d11video",
"wmfvpxvideo",
]) {
startupPhases["before first paint"].push({
path: `ProfD:${name}.guard`,
ignoreIfUnused: true,
stat: 1,
});
}
function expandWhitelistPath(path, canonicalize = false) {
if (path.includes(":")) {
let [prefix, suffix] = path.split(":");
let [key, property] = prefix.split(".");
let dir = Services.dirsvc.get(key, Ci.nsIFile);
if (property) {
dir = dir[property];
}
if (canonicalize) {
path = dir.QueryInterface(Ci.nsILocalFileWin).canonicalPath;
} else {
// Resolve symLinks.
let dirPath = dir.path;
while (dir && !dir.isSymlink()) {
dir = dir.parent;
}
if (dir) {
dirPath = dirPath.replace(dir.path, dir.target);
}
path = dirPath;
}
if (suffix) {
path += "/" + suffix;
}
}
if (AppConstants.platform == "win") {
path = path.replace(/\//g, "\\");
}
return path;
}
function getStackFromProfile(profile, stack) {
const stackPrefixCol = profile.stackTable.schema.prefix;
const stackFrameCol = profile.stackTable.schema.frame;
const frameLocationCol = profile.frameTable.schema.location;
let result = [];
while (stack) {
let sp = profile.stackTable.data[stack];
let frame = profile.frameTable.data[sp[stackFrameCol]];
stack = sp[stackPrefixCol];
frame = profile.stringTable[frame[frameLocationCol]];
if (frame != "js::RunScript" && !frame.startsWith("next (self-hosted:")) {
result.push(frame);
}
}
return result;
}
function pathMatches(path, filename) {
path = path.toLowerCase();
return (
path == filename || // Full match
// Wildcard on both sides of the path
(path.startsWith("*") &&
path.endsWith("*") &&
filename.includes(path.slice(1, -1))) ||
// Wildcard suffix
(path.endsWith("*") && filename.startsWith(path.slice(0, -1))) ||
// Wildcard prefix
(path.startsWith("*") && filename.endsWith(path.slice(1)))
);
}
add_task(async function() {
if (
!AppConstants.NIGHTLY_BUILD &&
!AppConstants.MOZ_DEV_EDITION &&
!AppConstants.DEBUG
) {
ok(
!("@mozilla.org/test/startuprecorder;1" in Cc),
"the startup recorder component shouldn't exist in this non-nightly/non-devedition/" +
"non-debug build."
);
return;
}
{
let omniJa = Services.dirsvc.get("XCurProcD", Ci.nsIFile);
omniJa.append("omni.ja");
if (!omniJa.exists()) {
ok(
false,
"This test requires a packaged build, " +
"run 'mach package' and then use --appname=dist"
);
return;
}
}
let startupRecorder = Cc["@mozilla.org/test/startuprecorder;1"].getService()
.wrappedJSObject;
await startupRecorder.done;
// Add system add-ons to the whitelist dynamically.
// They should go in the omni.ja file (bug 1357205).
{
let addons = await AddonManager.getAddonsByTypes(["extension"]);
for (let addon of addons) {
if (addon.isSystem) {
startupPhases["before opening first browser window"].push({
path: `XREAppFeat:${addon.id}.xpi`,
stat: 3,
close: 2,
});
startupPhases["before handling user events"].push({
path: `XREAppFeat:${addon.id}.xpi`,
condition: WIN,
stat: 2,
});
}
}
}
// Check for main thread I/O markers in the startup profile.
let profile = startupRecorder.data.profile.threads[0];
let phases = {};
{
const nameCol = profile.markers.schema.name;
const dataCol = profile.markers.schema.data;
let markersForCurrentPhase = [];
let foundIOMarkers = false;
for (let m of profile.markers.data) {
let markerName = profile.stringTable[m[nameCol]];
if (markerName.startsWith("startupRecorder:")) {
phases[
markerName.split("startupRecorder:")[1]
] = markersForCurrentPhase;
markersForCurrentPhase = [];
continue;
}
if (markerName != "FileIO") {
continue;
}
let markerData = m[dataCol];
if (markerData.source == "sqlite-mainthread") {
continue;
}
let samples = markerData.stack.samples;
let stack = samples.data[0][samples.schema.stack];
markersForCurrentPhase.push({
operation: markerData.operation,
filename: markerData.filename,
source: markerData.source,
stackId: stack,
});
foundIOMarkers = true;
}
// The I/O interposer is disabled if !RELEASE_OR_BETA, so we expect to have
// no I/O marker in that case, but it's good to keep the test running to check
// that we are still able to produce startup profiles.
is(
foundIOMarkers,
!AppConstants.RELEASE_OR_BETA,
"The IO interposer should be enabled in builds that are not RELEASE_OR_BETA"
);
if (!foundIOMarkers) {
// If a profile unexpectedly contains no I/O marker, it's better to return
// early to avoid having plenty of confusing "unused whitelist entry" failures.
return;
}
}
for (let phase in startupPhases) {
startupPhases[phase] = startupPhases[phase].filter(
entry => !("condition" in entry) || entry.condition
);
startupPhases[phase].forEach(entry => {
entry.listedPath = entry.path;
entry.path = expandWhitelistPath(entry.path, entry.canonicalize);
});
}
let tmpPath = expandWhitelistPath("TmpD:").toLowerCase();
let shouldPass = true;
for (let phase in phases) {
let whitelist = startupPhases[phase];
info(
`whitelisted paths ${phase}:\n` +
whitelist
.map(e => {
let operations = Object.keys(e)
.filter(k => k != "path")
.map(k => `${k}: ${e[k]}`);
return ` ${e.path} - ${operations.join(", ")}`;
})
.join("\n")
);
let markers = phases[phase];
for (let marker of markers) {
if (marker.operation == "create/open") {
// TODO: handle these I/O markers once they are supported on
// non-Windows platforms.
continue;
}
// Convert to lower case before comparing because the OS X test slaves
// have the 'Firefox' folder in 'Library/Application Support' created
// as 'firefox' for some reason.
let filename = marker.filename.toLowerCase();
if (!filename) {
// We are still missing the filename on some mainthreadio markers,
// these markers are currently useless for the purpose of this test.
continue;
}
if (!WIN && filename == "/dev/urandom") {
continue;
}
// /dev/shm is always tmpfs (a memory filesystem); this isn't
// really I/O any more than mmap/munmap are.
if (LINUX && filename.startsWith("/dev/shm/")) {
continue;
}
// Shared memory uses temporary files on MacOS <= 10.11 to avoid
// a kernel security bug that will never be patched (see
// https://crbug.com/project-zero/1671 for details). This can
// be removed when we no longer support those OS versions.
if (MAC && filename.startsWith(tmpPath + "/org.mozilla.ipc.")) {
continue;
}
let expected = false;
for (let entry of whitelist) {
if (pathMatches(entry.path, filename)) {
entry[marker.operation] = (entry[marker.operation] || 0) - 1;
entry._used = true;
expected = true;
break;
}
}
if (!expected) {
record(
false,
`unexpected ${marker.operation} on ${marker.filename} ${phase}`,
undefined,
" " + getStackFromProfile(profile, marker.stackId).join("\n ")
);
shouldPass = false;
}
info(`(${marker.source}) ${marker.operation} - ${marker.filename}`);
if (kDumpAllStacks) {
info(
getStackFromProfile(profile, marker.stackId)
.map(f => " " + f)
.join("\n")
);
}
}
for (let entry of whitelist) {
for (let op in entry) {
if (
[
"listedPath",
"path",
"condition",
"canonicalize",
"ignoreIfUnused",
"_used",
].includes(op)
) {
continue;
}
let message = `${op} on ${entry.path} `;
if (entry[op] == 0) {
message += "as many times as expected";
} else if (entry[op] > 0) {
message += `allowed ${entry[op]} more times`;
} else {
message += `${entry[op] * -1} more times than expected`;
}
ok(entry[op] >= 0, `${message} ${phase}`);
}
if (!("_used" in entry) && !entry.ignoreIfUnused) {
ok(
false,
`unused whitelist entry ${phase}: ${entry.path} (${entry.listedPath})`
);
shouldPass = false;
}
}
}
if (shouldPass) {
ok(shouldPass, "No unexpected main thread I/O during startup");
} else {
const filename = "profile_startup_mainthreadio.json";
let path = Cc["@mozilla.org/process/environment;1"]
.getService(Ci.nsIEnvironment)
.get("MOZ_UPLOAD_DIR");
let encoder = new TextEncoder();
let profilePath = OS.Path.join(path, filename);
await OS.File.writeAtomic(
profilePath,
encoder.encode(JSON.stringify(startupRecorder.data.profile))
);
ok(
false,
"Unexpected main thread I/O behavior during startup; open the " +
`${filename} artifact in the Firefox Profiler to see what happened`
);
}
});
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