Review Request 127236: Leverage QDir to know what's in a KIconThemeDir

[Kai Uwe Broulik]

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src/kicontheme.cpp (line 675)
<https://git.reviewboard.kde.org/r/127236/#comment63406>

    This looks like it causes a lot of transient allocations, creating a QList just to do a contains() on it. Or is this list kept/cached by QFile?


- Kai Uwe Broulik


On März 1, 2016, 3:25 vorm., Aleix Pol Gonzalez wrote:
> 
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> This is an automatically generated e-mail. To reply, visit:
> https://git.reviewboard.kde.org/r/127236/
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> (Updated März 1, 2016, 3:25 vorm.)
> 
> 
> Review request for KDE Frameworks and Christoph Feck.
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> Repository: kiconthemes
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> Description
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> At the moment we're playing Battleship to see if an icon is present in a subdirectory. This means that we are checking on every directory if there's an icon that matches the size with a said name on every request.
> 
> This can be seen easily with strace:
> ```
> $ strace kwrite |& grep ENOENT | wc -l
> 6212
> ```
> After the patch: 
> ```
> $ strace kwrite |& grep ENOENT | wc -l
> 1993
> ```
> We reduce these accesses to let QDir keep the list of files inside the directory (that was already being generated at some point, it just was being discarded).
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> 
> Diffs
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>   src/kicontheme.cpp 0996054 
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> Diff: https://git.reviewboard.kde.org/r/127236/diff/
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> 
> Testing
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> Builds, tests still pass, applications start noticeably faster.
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> 
> Thanks,
> 
> Aleix Pol Gonzalez
> 
>

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