Messages in this thread | | | Date | Sun, 24 Feb 2008 08:32:29 -0800 | From | "Siddha, Suresh B" <> | Subject | Re: [patch 2/2] x86,fpu: lazy allocation of FPU area |
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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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