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CONFIG_LAZY_SAVE_FPU: Save FPU state lazily

General informations

The Linux kernel configuration item CONFIG_LAZY_SAVE_FPU:

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Enable this to be lazy in the saving of the FPU state to the owning task's thread struct. This is useful if most tasks on the system don't use the FPU as only those tasks that use it will pass it between them, and the state needn't be saved for a task that isn't using it.

This can't be so easily used on SMP as the process that owns the FPU state on a CPU may be currently running on another CPU, so for the moment, it is disabled.



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