[Nepomuk] Review Request: FileWatch: Avoid calling the addWatch function recursively

[Simeon Bird]

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Ship it!


Ship It!

- Simeon Bird


On Dec. 1, 2012, 11:14 a.m., Vishesh Handa wrote:
> 
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> http://git.reviewboard.kde.org/r/107529/
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> (Updated Dec. 1, 2012, 11:14 a.m.)
> 
> 
> Review request for Nepomuk, Sebastian Trueg and Simeon Bird.
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> 
> Description
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> 
>     FileWatch: Avoid calling the addWatch function recursively
>     
>     A watch needs to be added for each directory. If we try to add the
>     watches recursively, then at each level a new string is allocated which
>     consumes memory. This memory is eventually freed, but that doesn't
>     decrease the filewatch service's memory footprint.
>     
>     Additionally, this extra memory can be quite large depending on how your
>     directory is structed. For me it makes a memory difference of about
>     50mb, but bug reports indicate that it can go as high as 2gb.
>     
>     _k_addWatches() now only adds one watch and then calls itself. It
>     additionally traverses the file system tree in a depth first manner in
>     order to avoid extra memory allocations. (Breadth first costs more
>     memory)
>     
>     BUG: 310556
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> 
> This addresses bug 310556.
>     http://bugs.kde.org/show_bug.cgi?id=310556
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> 
> Diffs
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>   services/filewatch/kinotify.cpp e540f76 
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> Diff: http://git.reviewboard.kde.org/r/107529/diff/
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> 
> Testing
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> Memory footprint reduced from 65 to 17mb.
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> 
> Thanks,
> 
> Vishesh Handa
> 
>

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