Re: [patch 2/2] x86,fpu: lazy allocation of FPU area

[Siddha, Suresh B]

On Sun, Feb 24, 2008 at 01:20:05PM +0100, Andi Kleen wrote:
> On Sat, Feb 23, 2008 at 06:34:39PM -0800, Suresh Siddha wrote:
> > Only allocate the FPU area when the application actually uses FPU, i.e., in the
> > first lazy FPU trap. This could save memory for non-fpu using apps.
> 
> Did you measure this making any difference? 
> 
> At least at some point glibc always touched the FPU once to initialize
> it.

Simple kernel boot showed that only 20 or so tasks using FPU, out of 
200 or so tasks running.

thanks,
suresh
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