Re: async-io API registration for 2.5.29

Benjamin LaHaise
2002-07-30T18:28:22Z

On Tue, Jul 30, 2002 at 11:15:26AM -0700, Linus Torvalds wrote:
> That still doesn't get the TLB advantages of a globally shared page at the
> same address.. It also has the overhead of mapping it, which you don't
> have if the thing is just always in the address space, and all processes
> just get created with that page mapped. That can be a big deal for process
> startup latency for small processes.

That might be a concern once glibc startup can occur with less than a few
dozen calls to grope through the local files. ;-) Hmmm, it would be possible
to make the vsyscall page mapped by default and leave the global bit enabled
until UML forcibly unmapped it (and then clear the global bit and do a global
invalidate). Would that be acceptible?

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