[Webkit-unassigned] [Bug 51262] WebPageProxy should delete its backing store after not painting for a while

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=51262





--- Comment #12 from Adam Roben (aroben) <aroben at apple.com>  2011-02-10 14:29:21 PST ---
(In reply to comment #9)
> Straw-person proposal:
> 
> 1. Begin with a timer interval of 5s.
> 2. After throwing away a backing store, record the time interval required for the next paint.
> 3. Update the timer interval to 100 * the recorded time interval in 2.
> 
> For fast-painting sites, this will throw backing stores away quickly. For slow-painting sites, this will approximate a maximum thrash cost of 1%.

A slight refinement to this would be to change step 3 to use an exponentially weighted moving average to update the timer interval. That would prevent an outlier repaint that took a vastly different amount of time from skewing the timer too much.

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