x86, fpu: lazy allocation of FPU area - v5

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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.

for example: on my system after boot, there are around 300 processes, with
only 17 using FPU.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

...

This commit is contained in:

Suresh Siddha 2008-03-10 15:28:05 -07:00 • committed by Ingo Molnar

parent 61c4628b53

commit aa283f4927

8 changed files with 91 additions and 23 deletions

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38

arch/x86/kernel/i387.c

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28

arch/x86/kernel/process.c

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4

arch/x86/kernel/process_32.c

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4

arch/x86/kernel/process_64.c

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17

arch/x86/kernel/traps_32.c

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19

arch/x86/kernel/traps_64.c

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2

include/asm-x86/i387.h

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2

include/asm-x86/processor.h

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