Updates:
Cc: [email protected] [email protected] [email protected]
Comment #8 on issue 2077 by [email protected]: The scavenger GC does not
collect independent DOM objects
http://code.google.com/p/v8/issues/detail?id=2077
Given that it takes two scavenger cycles before promotion
This is not true. We start promoting everything aggressively once 25% of
to-space is occupied. Which is exactly what happens if from-space was full
of weakly reachable objects. At the same time promoting a lot of weakly
reachable objects "confuses" heuristics: you can see that mark-sweep is
caused because promotion limit was exceeded.
GC cost of DOM object was always a big pain point for us. If as Anton says
there is only a handful of corner cases we can consider introducing
additional weak callbacks API that would be much lighter (e.g. would not
have to copy object at all and will invoke weak callbacks "in place").
Kenneth Russel (cced), was considering another approach (for some classes
of objects, e.g. Image): detecting when object becomes part of the dom (and
thus can participate in object grouping).
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