Review Request 122109: Cache QMetaMethods that are invoked on hot paths.

[Milian Wolff]

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Ship it!



src/krecursivefilterproxymodel.cpp
<https://git.reviewboard.kde.org/r/122109/#comment51513>

    I'd personally move the indexOfMethod + method call into a static free function and use it here and below to share some code.
    
        QMetaMethod findMethod(const QObject* object, const char* signature)
        {
            int idx = object->metaObject()->indexOfMethod(signature);
            Q_ASSERT(idx != -1);
            return object->metaObject()->method(idx);
        }
        
        ...
        
        static const QMetaMethod method = findMethod(q, "_q_sourceDataChanged(...)");


- Milian Wolff


On Jan. 17, 2015, 5:22 p.m., Volker Krause wrote:
> 
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> This is an automatically generated e-mail. To reply, visit:
> https://git.reviewboard.kde.org/r/122109/
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> (Updated Jan. 17, 2015, 5:22 p.m.)
> 
> 
> Review request for KDE Frameworks and Milian Wolff.
> 
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> Repository: kitemmodels
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> Description
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> QMetaObject::invokeMethod calls QMetaObject::indexForMethod internally,
> which is rather expensive. So look up the method once, and invoke it
> via QMetaMethod directly.
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> 
> Diffs
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>   src/krecursivefilterproxymodel.cpp 241f2e8e7e610c397bebc6608a64e4f12e570aea 
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> Diff: https://git.reviewboard.kde.org/r/122109/diff/
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> Testing
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> Tested and measured with the KRFPM usage in GammaRay, saves about 5% of total application CPU cost according to callgrind.
> 
> 
> Thanks,
> 
> Volker Krause
> 
>

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