799336 - Style data is double-counted with multiple windows open

Status: RESOLVED DUPLICATE of bug 768901

(Core :: CSS Parsing and Computation, defect)

Description

[Nicholas Nethercote [inactive]]

Attachment: stack trace

DMD tells me that when two about:blank windows are open and we run the memory reporters, lots of style data is being measured twice.

Attached is an example stack trace for the reporting of nsCSSStyleSheetInner;  the stack trace was the same for both measurements.  Other things being double-counted include rules, selectors, nsCSSValue, StringBuffers... pretty much all kinds of style data.

I guess there must be some sharing of style sheets (or something like that) between windows that we're not accounting for.

This also shows up on B2G when profiling the home screen.