Re: aio-core why not using SuS? [Re: [rfc] aio-core for 2.5.29 (Re: async-io API registration for 2.5.29)]

Benjamin LaHaise
2002-08-16T02:12:52Z

On Thu, Aug 15, 2002 at 07:08:30PM -0700, Linus Torvalds wrote:
>
> On Thu, 15 Aug 2002, Benjamin LaHaise wrote:
> >
> > A 4G/4G split flushes the TLB on every syscall.
>
> This is just not going to happen. It will have to continue being a 3/1G
> split, and we'll just either find a way to move stuff to highmem and
> shrink the "struct page", or we'll just say "screw those 16GB+ machines on
> x86".

I wish life were that simple. Unfortunately, struct page isn't the only
problem with these abominations: the system can run out of kvm for
vm_area_struct, task_struct, files... Personally, I *never* want to see
those data structures being kmap()'d as it would hurt kernel code quality
whereas a 4G/4G split is well confined, albeit sickening.

-ben
--
"You will be reincarnated as a toad; and you will be much happier."