Re: [RFC] Making compound pages mandatory

[Linus Torvalds]

On Tue, 16 Nov 2004, David Howells wrote:
> 
> Do you have any objection to compound pages being made mandatory, even without
> HUGETLB support?

I haven't really looked into it, so I cannot make an informed decision.  
How big is the overhead? And what's the _point_, since we don't seem to 
need them normally, but the code is there for people who _do_ need them? 

I don't generally like two paths, but quite frankly, I consider the
non-compound case the regular case right now. How expensive does the
compound pages end up being? Is it just one more pointer chase on every
get_page/put_page, or what? Does anybody have numbers for before/after 
that are otherwise comparable?

		Linus
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/