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Merge pull request #197010 from tpwrules/disable-qt-cache

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Sandro 2022-11-01 16:09:35 +01:00 committed by GitHub
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11 changed files with 119 additions and 18 deletions
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13
nixos/doc/manual/from_md/release-notes/rl-2211.section.xml
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@ -1131,6 +1131,19 @@
Add udev rules for the Teensy family of microcontrollers.
</para>
</listitem>
<listitem>
<para>
The Qt QML disk cache is now disabled by default. This fixes a
long-standing issue where updating Qt/KDE apps would sometimes
cause them to crash or behave strangely without explanation.
Those concerned about the small (~10%) performance hit to
application startup can re-enable the cache (and expose
themselves to gremlins) by setting the envrionment variable
<literal>QML_FORCE_DISK_CACHE</literal> to
<literal>1</literal> using e.g. the
<literal>environment.sessionVariables</literal> NixOS option.
</para>
</listitem>
<listitem>
<para>
systemd-oomd is enabled by default. Depending on which systemd

8
nixos/doc/manual/release-notes/rl-2211.section.md
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@ -342,6 +342,14 @@ Available as [services.patroni](options.html#opt-services.patroni.enable).
- Add udev rules for the Teensy family of microcontrollers.
- The Qt QML disk cache is now disabled by default. This fixes a
long-standing issue where updating Qt/KDE apps would sometimes cause
them to crash or behave strangely without explanation. Those concerned
about the small (~10%) performance hit to application startup can
re-enable the cache (and expose themselves to gremlins) by setting the
envrionment variable `QML_FORCE_DISK_CACHE` to `1` using e.g. the
`environment.sessionVariables` NixOS option.
- systemd-oomd is enabled by default. Depending on which systemd units have
`ManagedOOMSwap=kill` or `ManagedOOMMemoryPressure=kill`, systemd-oomd will
SIGKILL all the processes under the appropriate descendant cgroups when the

15
nixos/modules/services/x11/display-managers/sddm.nix
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@ -269,20 +269,5 @@ in
# To enable user switching, allow sddm to allocate TTYs/displays dynamically.
services.xserver.tty = null;
services.xserver.display = null;
systemd.tmpfiles.rules = [
# Prior to Qt 5.9.2, there is a QML cache invalidation bug which sometimes
# strikes new Plasma 5 releases. If the QML cache is not invalidated, SDDM
# will segfault without explanation. We really tore our hair out for awhile
# before finding the bug:
# https://bugreports.qt.io/browse/QTBUG-62302
# We work around the problem by deleting the QML cache before startup.
# This was supposedly fixed in Qt 5.9.2 however it has been reported with
# 5.10 and 5.11 as well. The initial workaround was to delete the directory
# in the Xsetup script but that doesn't do anything.
# Instead we use tmpfiles.d to ensure it gets wiped.
# This causes a small but perceptible delay when SDDM starts.
"e ${config.users.users.sddm.home}/.cache - - - 0"
];
};
}

6
pkgs/development/libraries/qt-5/5.12/default.nix
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@ -81,7 +81,11 @@ let
sha256 = "0crkw3j1iwdc1pbf5dhar0b4q3h5gs2q1sika8m12y02yk3ns697";
})
];
qtdeclarative = [ ./qtdeclarative.patch ];
qtdeclarative = [
./qtdeclarative.patch
# prevent headaches from stale qmlcache data
./qtdeclarative-default-disable-qmlcache.patch
];
qtlocation = [ ./qtlocation-gcc-9.patch ];
qtscript = [ ./qtscript.patch ];
qtserialport = [ ./qtserialport.patch ];

40
pkgs/development/libraries/qt-5/5.12/qtdeclarative-default-disable-qmlcache.patch Normal file
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@ -0,0 +1,40 @@
diff --git a/src/qml/qml/qqmltypeloader.cpp b/src/qml/qml/qqmltypeloader.cpp
index 9e5bc0b0..9219def6 100644
--- a/src/qml/qml/qqmltypeloader.cpp
+++ b/src/qml/qml/qqmltypeloader.cpp
@@ -2151,7 +2151,7 @@ void QQmlTypeData::unregisterCallback(TypeDataCallback *callback)
bool QQmlTypeData::tryLoadFromDiskCache()
{
- if (disableDiskCache() && !forceDiskCache())
+ if (!forceDiskCache())
return false;
if (isDebugging())
@@ -2658,7 +2658,7 @@ void QQmlTypeData::compile(const QQmlRefPointer<QQmlTypeNameCache> &typeNameCach
return;
}
- const bool trySaveToDisk = (!disableDiskCache() || forceDiskCache()) && !m_document->jsModule.debugMode && !typeRecompilation;
+ const bool trySaveToDisk = (forceDiskCache()) && !m_document->jsModule.debugMode && !typeRecompilation;
if (trySaveToDisk) {
QString errorString;
if (m_compiledData->saveToDisk(url(), &errorString)) {
@@ -3014,7 +3014,7 @@ QQmlRefPointer<QQmlScriptData> QQmlScriptBlob::scriptData() const
void QQmlScriptBlob::dataReceived(const SourceCodeData &data)
{
- if (!disableDiskCache() || forceDiskCache()) {
+ if (forceDiskCache()) {
QQmlRefPointer<QV4::CompiledData::CompilationUnit> unit = QV4::Compiler::Codegen::createUnitForLoading();
QString error;
if (unit->loadFromDisk(url(), data.sourceTimeStamp(), &error)) {
@@ -3077,7 +3077,7 @@ void QQmlScriptBlob::dataReceived(const SourceCodeData &data)
qmlGenerator.generate(irUnit);
}
- if ((!disableDiskCache() || forceDiskCache()) && !isDebugging()) {
+ if ((forceDiskCache()) && !isDebugging()) {
QString errorString;
if (unit->saveToDisk(url(), &errorString)) {
QString error;

6
pkgs/development/libraries/qt-5/5.14/default.nix
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@ -68,7 +68,11 @@ let
./qtbase.patch.d/0010-qtbase-assert.patch
./qtbase.patch.d/0011-fix-header_module.patch
];
qtdeclarative = [ ./qtdeclarative.patch ];
qtdeclarative = [
./qtdeclarative.patch
# prevent headaches from stale qmlcache data
./qtdeclarative-default-disable-qmlcache.patch
];
qtlocation = [ ./qtlocation-gcc-9.patch ];
qtscript = [ ./qtscript.patch ];
qtserialport = [ ./qtserialport.patch ];

13
pkgs/development/libraries/qt-5/5.14/qtdeclarative-default-disable-qmlcache.patch Normal file
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@ -0,0 +1,13 @@
diff --git a/src/qml/qml/qqmltypeloader.cpp b/src/qml/qml/qqmltypeloader.cpp
index 6c12de92..fc67dc07 100644
--- a/src/qml/qml/qqmltypeloader.cpp
+++ b/src/qml/qml/qqmltypeloader.cpp
@@ -705,7 +705,7 @@ bool QQmlTypeLoader::Blob::isDebugging() const
bool QQmlTypeLoader::Blob::diskCacheEnabled() const
{
- return (!disableDiskCache() || forceDiskCache()) && !isDebugging();
+ return (forceDiskCache()) && !isDebugging();
}
bool QQmlTypeLoader::Blob::qmldirDataAvailable(const QQmlRefPointer<QQmlQmldirData> &data, QList<QQmlError> *errors)

6
pkgs/development/libraries/qt-5/5.15/default.nix
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@ -56,7 +56,11 @@ let
./qtbase.patch.d/0010-qtbase-assert.patch
./qtbase.patch.d/0011-fix-header_module.patch
];
qtdeclarative = [ ./qtdeclarative.patch ];
qtdeclarative = [
./qtdeclarative.patch
# prevent headaches from stale qmlcache data
./qtdeclarative-default-disable-qmlcache.patch
];
qtscript = [ ./qtscript.patch ];
qtserialport = [ ./qtserialport.patch ];
qtwebengine = lib.optionals stdenv.isDarwin [

13
pkgs/development/libraries/qt-5/5.15/qtdeclarative-default-disable-qmlcache.patch Normal file
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@ -0,0 +1,13 @@
diff --git a/src/qml/qml/qqmltypeloader.cpp b/src/qml/qml/qqmltypeloader.cpp
index 1d66e75..827567a 100644
--- a/src/qml/qml/qqmltypeloader.cpp
+++ b/src/qml/qml/qqmltypeloader.cpp
@@ -727,7 +727,7 @@ bool QQmlTypeLoader::Blob::isDebugging() const
bool QQmlTypeLoader::Blob::diskCacheEnabled() const
{
- return (!disableDiskCache() && !isDebugging()) || forceDiskCache();
+ return forceDiskCache();
}
bool QQmlTypeLoader::Blob::qmldirDataAvailable(const QQmlRefPointer<QQmlQmldirData> &data, QList<QQmlError> *errors)

4
pkgs/development/libraries/qt-6/modules/qtdeclarative.nix
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@ -16,6 +16,10 @@ qtModule {
"-DQT6_INSTALL_PREFIX=${placeholder "out"}"
"-DQT_INSTALL_PREFIX=${placeholder "out"}"
];
patches = [
# prevent headaches from stale qmlcache data
../patches/qtdeclarative-default-disable-qmlcache.patch
];
postInstall = ''
substituteInPlace "$out/lib/cmake/Qt6Qml/Qt6QmlMacros.cmake" \
--replace ''\'''${QT6_INSTALL_PREFIX}' "$dev"

13
pkgs/development/libraries/qt-6/patches/qtdeclarative-default-disable-qmlcache.patch Normal file
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@ -0,0 +1,13 @@
diff --git a/src/qml/jsruntime/qv4engine.cpp b/src/qml/jsruntime/qv4engine.cpp
index 852cde9e..165f1b57 100644
--- a/src/qml/jsruntime/qv4engine.cpp
+++ b/src/qml/jsruntime/qv4engine.cpp
@@ -2093,7 +2093,7 @@ void ExecutionEngine::registerModule(const QString &_name, const QJSValue &modul
bool ExecutionEngine::diskCacheEnabled() const
{
- return (!disableDiskCache() && !debugger()) || forceDiskCache();
+ return forceDiskCache();
}
void ExecutionEngine::callInContext(QV4::Function *function, QObject *self,