[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 #18 from Adam Roben (aroben) <aroben at apple.com>  2011-02-11 12:33:55 PST ---
Let's compare an MRU cache that allows N concurrent backing stores to exist, vs. a per-WebPageProxy timer that throws away that page's backing store when it fires.

One case where the MRU cache would result in lower memory usage is if you had X windows open that were all animating, where X > N and the animation frequency is higher than the timer frequency. With the MRU cache, you'd have only N backing stores, while with the timer you'd have X backing stores.

One case where the timer would result in lower memory usage is if you had X windows open, then closed some of them to leave Y windows open, where X > N and Y < N. With the MRU cache, you'd still have N backing stores, while with the timer you'd only have Y backing stores, even if all the windows are animating.

Another case where the timer results in lower memory usage is if you have many windows open but none of them are needing to paint. The timer can get you down to 0 backing stores, while the MRU cache will leave you with N backing stores.

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