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

[David Edmundson]

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https://git.reviewboard.kde.org/r/116577/
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Review request for Plasma.


Repository: plasma-framework


Description
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Call malloc_trim() when deleting a dialog

A dialog will typically contain lots and lots of tiny objects.

Tiny mallocs are not returned to the system immediately and are left for
us to re-use.

When we delete a dialog it would be a good time to release these.

This fixes the memory growth when repeatedly opening and closing the
widget explorer.

TBH: I don't /fully/ understand malloc_trim, but it does seem this patch makes a difference.

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.


Diffs
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  src/declarativeimports/core/dialog.cpp 61e8d93 

Diff: https://git.reviewboard.kde.org/r/116577/diff/


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.

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


Thanks,

David Edmundson

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