Comment 65 for bug 1751460

One thing I just noticed, from https://bugzilla.gnome.org/show_bug.cgi?id=794056, is that this stack trace is exactly the same as the one valgrind hits when trying to use valgrind to debug epiphany since gigacage was enabled. That's probably expected, since valgrind attempts to allocate shadow bytes to keep track of the entire address space, which isn't practical under gigacage.

(In reply to Yusuke Suzuki from comment #6)
> Anyway, @mcatanzaro, do you know the way to allocate virtual memory region
> which does not have actual backing pages?

I have no clue about this. I thought actual backing pages were only employed once the memory region is actually used.