Re: Better CLONE_SETTLS support for Hammer

[Andi Kleen]

On Wed, Mar 05, 2003 at 11:32:36AM -0800, Ulrich Drepper wrote:
> > If you just want to save one mmap/allocation: I think the context switch
> > overhead will be more expensive than the allocation.
> 
> And two more things:
> 
> 1. every process will already use the prctl(ARCH_SET_FS).  We are
> talking here only about the 2nd thread and later.  We need to use
> prctl(ARCH_SET_FS) for TLS support.

Not when you put it into the first four GB. Then you can use the same
calls as 32bit.

> 2. May I remind you that you were in the crowd who complained when we
> requested a dedicated thread register?  Yes, I still would prefer that
> but I have no energy to battle for that.

I don't see the connection.

-Andi