[Webkit-unassigned] [Bug 42756] JIT requires VM overcommit (particularly on x86-64), Linux does not by default support this without swap?

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=42756





--- Comment #28 from Oliver Hunt <oliver at apple.com>  2011-01-12 14:09:31 PST ---
(In reply to comment #27)
> I haven't been able to provide a lot of feedback, mostly because of exams but what really leaves me wondering is that the JIT tries to get 4GB of memory. 4GB.
> 
> It might not use it but 4GB is simply too much.
> 
> What's actually the point? Do we really want that to happen? And why ask for that much if it's not going to be used?
> 
> IIRC that also happens without even using javascript. Why does the JIT allocate a huge amount of memory without even requiring any memory actually?

It should only be requesting 2gig, and it's expecting the OS to merely reserve address space -- it's not expecting physical memory to be committed.

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