mirror of https://github.com/qt/qtbase.git
03d5daf943
Large graphical Qt applications heavily rely on heap allocations. Jemalloc is a general-purpose malloc(3) implementation designed to reduce heap fragmentation and improve scalability. It also provides extensive tuning options. Add a -jemalloc configure option, disabled by default. When enabled, Qt and user code link to jemalloc, overriding the system's default malloc(). Add cooperation with jemalloc for some Qt key classes: QArrayData (used by QByteArray, QString and QList<T>), QBindingStoragePrivate, QDataBuffer (used by the Qt Quick renderer), QDistanceFieldData, QImageData, QObjectPrivate::TaggedSignalVector, QVarLengthArray. This cooperation relies on two jemalloc-specific optimizations: 1. Efficient allocation via fittedMalloc(): Determine the actual allocation size using nallocx(), then adjust the container’s capacity to match. This minimizes future reallocations. Note: we round allocSize to a multiple of sizeof(T) to ensure that we can later recompute the exact allocation size during deallocation. 2. Optimized deallocation via sizedFree(): Use sdallocx(), which is faster than free when the allocation size is known, as it avoids internal size lookups. Adapt the QVarLengthArray auto tests on capacity. Non-standard functions docs are at https://jemalloc.net/jemalloc.3.html [ChangeLog][QtCore] Added optional support for the jemalloc allocator, and optimized memory allocations and deallocations in core Qt classes to cooperate with it. Change-Id: I6166e64e66876dee22662d3f3ea3e42a6647cfeb Reviewed-by: Thiago Macieira <thiago.macieira@intel.com> |
||
|---|---|---|
| .github/workflows | ||
| LICENSES | ||
| bin | ||
| cmake | ||
| coin | ||
| config.tests | ||
| dist | ||
| doc | ||
| examples | ||
| lib | ||
| libexec | ||
| mkspecs | ||
| qmake | ||
| src | ||
| tests | ||
| util | ||
| .cmake.conf | ||
| .gitattributes | ||
| .gitignore | ||
| .gitreview | ||
| .tag | ||
| CMakeLists.txt | ||
| REUSE.toml | ||
| config_help.txt | ||
| configure | ||
| configure.bat | ||
| configure.cmake | ||
| dependencies.yaml | ||
| licenseRule.json | ||
| qt_cmdline.cmake | ||