Messages in this thread | | | Date | Thu, 30 Mar 2006 10:11:16 +0200 (MEST) | From | Jan Engelhardt <> | Subject | Re: Float numbers in module programming |
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> >This used to be a FAQ. The floating-point coprocessor in ix86 >machines is a shared resource. There is only one. Therefore, >the state of the floating-point unit needs to be saved and >restored across all context switches. Because this is expensive >in terms of CPU time used, it is not saved and restored during >system calls. This means that if you use the coprocessor in >the kernel, you may screw up somebody's mathematics,
"somebody" is the current process, is not it? What if used in kthreads?
Jan Engelhardt -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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