Review Request 122487: Reorder member variables to reduce memory usage.

[Volker Krause]

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https://git.reviewboard.kde.org/r/122487/
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Review request for KDE Frameworks.


Repository: kcoreaddons


Description
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The KJobPrivate one saves 24 bytes per instance, the others 8 bytes (on a 64 bit system).


Diffs
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  src/lib/io/kdirwatch_p.h f8cc2bcd5b9a8c65b409873ac78455fbb7db2405 
  src/lib/jobs/kjob.cpp de3b8d7c8985dcc21ef9f52fba47361e9675f192 
  src/lib/jobs/kjob_p.h 8bacefecc4dc8d2679a48b224837e0c01516d601 
  src/lib/plugin/kpluginloader.cpp 64d7f0cec37ef51a76a3a60637822810cab398e6 

Diff: https://git.reviewboard.kde.org/r/122487/diff/


Testing
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```
Struct "Entry (DW_TAG_class_type, offset 393887)" is sub-optimally packed: 74/88 bytes, 592/704 bits, optimal size is: 80 bytes
class KDirWatchPrivate::Entry // location: /k/kde5/src/kcoreaddons/src/lib/io/kdirwatch_p.h:83
{
    time_t m_ctime; // member offset: 0, size: 8, alignment: 8
    int m_nlink; // member offset: 8, size: 4, alignment: 4
    // 4 byte(s) padding
    ino_t m_ino; // member offset: 16, size: 8, alignment: 8
    entryStatus m_status; // member offset: 24, size: 4, alignment: 4
    entryMode m_mode; // member offset: 28, size: 4, alignment: 4
    bool isDir; // member offset: 32, size: 1, alignment: 1
    // 7 byte(s) padding
    QList<KDirWatchPrivate::Client*> m_clients; // member offset: 40, size: 8, alignment: 8
    QList<KDirWatchPrivate::Entry*> m_entries; // member offset: 48, size: 8, alignment: 8
    QString path; // member offset: 56, size: 8, alignment: 8
    int msecLeft; // member offset: 64, size: 4, alignment: 4
    int freq; // member offset: 68, size: 4, alignment: 4
    bool dirty; // member offset: 72, size: 1, alignment: 1
    // 3 byte(s) padding
    int wd; // member offset: 76, size: 4, alignment: 4
    QList<QString> m_pendingFileChanges; // member offset: 80, size: 8, alignment: 8
}; // size: 88, alignment: 8

Struct "KJobPrivate (DW_TAG_class_type, offset 1112242)" is sub-optimally packed: 95/120 bytes, 760/960 bits, optimal size is: 96 bytes
class KJobPrivate // location: /k/kde5/src/kcoreaddons/src/lib/jobs/kjob_p.h:36
{
    __vtbl_ptr_type* _vptr.KJobPrivate; // member offset: 0, size: 8, alignment: 8
    KJob* q_ptr; // member offset: 8, size: 8, alignment: 8
    KJobUiDelegate* uiDelegate; // member offset: 16, size: 8, alignment: 8
    int error; // member offset: 24, size: 4, alignment: 4
    // 4 byte(s) padding
    QString errorText; // member offset: 32, size: 8, alignment: 8
    Unit progressUnit; // member offset: 40, size: 4, alignment: 4
    // 4 byte(s) padding
    QMap<KJob::Unit, long long unsigned int> processedAmount; // member offset: 48, size: 8, alignment: 8
    QMap<KJob::Unit, long long unsigned int> totalAmount; // member offset: 56, size: 8, alignment: 8
    long unsigned int percentage; // member offset: 64, size: 8, alignment: 8
    bool suspended; // member offset: 72, size: 1, alignment: 1
    // 3 byte(s) padding
    Capabilities capabilities; // member offset: 76, size: 4, alignment: 4
    QTimer* speedTimer; // member offset: 80, size: 8, alignment: 8
    bool isAutoDelete; // member offset: 88, size: 1, alignment: 1
    // 7 byte(s) padding
    QEventLoop* eventLoop; // member offset: 96, size: 8, alignment: 8
    QEventLoopLocker eventLoopLocker; // member offset: 104, size: 8, alignment: 8
    bool isFinished; // member offset: 112, size: 1, alignment: 1
    // 7 byte(s) padding
}; // size: 120, alignment: 8

Struct "KPluginLoaderPrivate (DW_TAG_class_type, offset 1584914)" is sub-optimally packed: 37/48 bytes, 296/384 bits, optimal size is: 40 bytes
class KPluginLoaderPrivate // location: /k/kde5/src/kcoreaddons/src/lib/plugin/kpluginloader.cpp:37
{
    KPluginLoader* q_ptr; // member offset: 0, size: 8, alignment: 8
    QString const name; // member offset: 8, size: 8, alignment: 8
    quint32 pluginVersion; // member offset: 16, size: 4, alignment: 4
    // 4 byte(s) padding
    QString errorString; // member offset: 24, size: 8, alignment: 8
    bool pluginVersionResolved; // member offset: 32, size: 1, alignment: 1
    // 7 byte(s) padding
    QPluginLoader* loader; // member offset: 40, size: 8, alignment: 8
}; // size: 48, alignment: 8
```


Thanks,

Volker Krause

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