Review Request 116577: Call malloc_trim() when deleting a dialog

[Martin Gräßlin]

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recommendation: look at kwin/main.cpp kdemain()

- Martin Gräßlin


On March 3, 2014, 8:52 p.m., David Edmundson wrote:
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> (Updated March 3, 2014, 8:52 p.m.)
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> 
> Review request for Plasma.
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> Repository: plasma-framework
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> Description
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> Call malloc_trim() when deleting a dialog
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> A dialog will typically contain lots and lots of tiny objects.
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> Tiny mallocs are not returned to the system immediately and are left for
> us to re-use.
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> When we delete a dialog it would be a good time to release these.
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> This fixes the memory growth when repeatedly opening and closing the
> widget explorer.
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> TBH: I don't /fully/ understand malloc_trim, but it does seem this patch makes a difference.
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> Also I think maybe this would be better being in the destructor of KDeclatarive::QMLObject as well?
> or maybe we should tune the malloc options so it behaves better in general.
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> Diffs
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>   src/declarativeimports/core/dialog.cpp 61e8d93 
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> Diff: https://git.reviewboard.kde.org/r/116577/diff/
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> Testing
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> The following test (courtesy of Martin K) http://paste.kde.org/pjreffopt creates 10 dialogs, waits 5 seconds and deletes them.
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> Before: Memory usage in ksysguard goes up to 125Mb and stays there indefinitely.
> After:Memory usage in ksysguard goes up to 125Mb and when the dialogs are removed goes back down to 35Mb
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> 
> Thanks,
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> David Edmundson
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